From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f52.google.com (mail-ot1-f52.google.com [209.85.210.52]) (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 B0BDC4E1CF for ; Tue, 27 Feb 2024 18:48:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709059735; cv=none; b=EHXaBAOa9iLVp/XL4assKWNSJreeok+wM9zlCY6YYLIxCiaHnTqo1uqW0SKxeaQwpb/Iakv4Z4sL26DXmobV6dp8lNu/NVkIEXVZX/RYy8j6vZGIdGDuZCWf/4mED6x0I3NtULai7xQoxm/u37Ut79sbn+J2eEr7mR9KANBDwdM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709059735; c=relaxed/simple; bh=PTI7AoBBKPlVbATwuk88n8/DPJn7loFHIpoMPNdnVZA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Uzbqp+uhUQan2MzFKHhfj5b8XhAML2Ve81ldHtHVA5QwXv3VY3MAJ42RTBTHgHcrPOhOdFQTmky3S87ud21IhM29bCZtBooE02M9IQPh9giP27c0B9FD6nXKVzurq+S4USg4+Zrq1Nq5cDIcvyzRiGyzUTi7NbyCpu1AzR5PIYM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk; spf=pass smtp.mailfrom=kernel.dk; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b=khp5BQF4; arc=none smtp.client-ip=209.85.210.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.dk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b="khp5BQF4" Received: by mail-ot1-f52.google.com with SMTP id 46e09a7af769-6e2b466d213so1087767a34.0 for ; Tue, 27 Feb 2024 10:48:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1709059732; x=1709664532; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=JAwXJVEwY3pE0HGSRE7b+X6KLN9ymt6KBTvlVLJ9lrg=; b=khp5BQF4RNuzhQ79lziUvMaiMCF2aOd9A0QW47Dl5bGLh8L31sxxQO3/rPc9FD66M5 Ydge8o/1yO0mcNU1xhSDwxUigLtU0twF+Il2CosP2q2uNxgNRH91Rn4yidooA1YQrJCA GWPJQWaUjDmCn91khGsuVg9BRf7PPq3UPGIBN2xH82K9aAaYJPjMZsKzeU/Z/lcpHWU8 MOhIFrh1MEHOb12qHY5dMXRHiRtko8eZTR8MrBC7TNhEbGi5OrYuTLylQot3mErOmxr2 5hibtwN3Sl/uaIrqd1EkmC6lQC1zZfdTO46lX37ksF+8+cNlGqClBbWFLRu9SjIi2Pya 3R0A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709059732; x=1709664532; 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=JAwXJVEwY3pE0HGSRE7b+X6KLN9ymt6KBTvlVLJ9lrg=; b=itxW+mcyoZfs9lU9wMv1IxV8EqeNv2/WdbT9XMsg4B7Qo54VnATAM+BGLasilWvklI t5A9RBKZ1bgsEP2+0uYIOyC/qNAbkqpkqoRPUIs5q9/rZNIHUcHA+SaYlnSJcJ8vbXZW uipPhUSW/0kM3JyqdKl4UvbMQj0/gLhqSCbjNIsWnG3Bf/KYKLsgywXAWec4qf5z5KZb G/+2TVZuI7QcsMQxFw7cBcIM3yvdmQdFIuDEF6rfVPf2ibY2ccWYrjxSfKj2hDDu/rCP jLcEJJbNV7NGifxo++9DEq0lO6Xv40P/Bi2G2v+apIiJUOT0J/hOxB1wOpQmAz5nOFXO CMwQ== X-Gm-Message-State: AOJu0Yyy0qM5kM4WOuVYykPZNDmT60Y9nLvaHWupclr+32bQJHjObD1H 7r+FKX25zebbm1I6pzeZgCpo2yheemwodRXgxyG9H9av0WILQXl1KAsK52RlVB9AtZiDuLBRXNt O X-Google-Smtp-Source: AGHT+IFe1IXNQzuw5caqdR+RfspVKg6bEsMWNeUKIoGTrI56JM8pMRc4Tk6zD5HfdHgtkoGEToPiag== X-Received: by 2002:a05:6830:14:b0:6e2:ead9:f43d with SMTP id c20-20020a056830001400b006e2ead9f43dmr11726380otp.3.1709059732394; Tue, 27 Feb 2024 10:48:52 -0800 (PST) Received: from localhost.localdomain ([198.8.77.194]) by smtp.gmail.com with ESMTPSA id it2-20020a056a00458200b006e543b59587sm2282119pfb.126.2024.02.27.10.48.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Feb 2024 10:48:51 -0800 (PST) From: Jens Axboe To: io-uring@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 2/3] io_uring/net: move receive multishot out of the generic msghdr path Date: Tue, 27 Feb 2024 11:46:31 -0700 Message-ID: <20240227184845.985268-3-axboe@kernel.dk> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240227184845.985268-1-axboe@kernel.dk> References: <20240227184845.985268-1-axboe@kernel.dk> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Move the actual user_msghdr / compat_msghdr into the send and receive sides, respectively, so we can move the uaddr receive handling into its own handler, and ditto the multishot with buffer selection logic. Signed-off-by: Jens Axboe --- io_uring/net.c | 161 ++++++++++++++++++++++++++++--------------------- 1 file changed, 91 insertions(+), 70 deletions(-) diff --git a/io_uring/net.c b/io_uring/net.c index 8c64e552a00f..7a07c5563d66 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -204,46 +204,26 @@ static int io_setup_async_msg(struct io_kiocb *req, return -EAGAIN; } -static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) -{ - int hdr; - - if (iomsg->namelen < 0) - return true; - if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), - iomsg->namelen, &hdr)) - return true; - if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) - return true; - - return false; -} - #ifdef CONFIG_COMPAT -static int __io_compat_msg_copy_hdr(struct io_kiocb *req, - struct io_async_msghdr *iomsg, - struct sockaddr __user **addr, int ddir) +static int io_compat_msg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg, + struct compat_msghdr *msg, int ddir) { struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); - struct compat_msghdr msg; struct compat_iovec __user *uiov; int ret; - if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) + if (copy_from_user(msg, sr->umsg_compat, sizeof(*msg))) return -EFAULT; - ret = __get_compat_msghdr(&iomsg->msg, &msg, addr); - if (ret) - return ret; - - uiov = compat_ptr(msg.msg_iov); + uiov = compat_ptr(msg->msg_iov); if (req->flags & REQ_F_BUFFER_SELECT) { compat_ssize_t clen; iomsg->free_iov = NULL; - if (msg.msg_iovlen == 0) { + if (msg->msg_iovlen == 0) { sr->len = 0; - } else if (msg.msg_iovlen > 1) { + } else if (msg->msg_iovlen > 1) { return -EINVAL; } else { if (!access_ok(uiov, sizeof(*uiov))) @@ -255,18 +235,11 @@ static int __io_compat_msg_copy_hdr(struct io_kiocb *req, sr->len = clen; } - if (ddir == ITER_DEST && req->flags & REQ_F_APOLL_MULTISHOT) { - iomsg->namelen = msg.msg_namelen; - iomsg->controllen = msg.msg_controllen; - if (io_recvmsg_multishot_overflow(iomsg)) - return -EOVERFLOW; - } - return 0; } iomsg->free_iov = iomsg->fast_iov; - ret = __import_iovec(ddir, (struct iovec __user *)uiov, msg.msg_iovlen, + ret = __import_iovec(ddir, (struct iovec __user *)uiov, msg->msg_iovlen, UIO_FASTIOV, &iomsg->free_iov, &iomsg->msg.msg_iter, true); if (unlikely(ret < 0)) @@ -276,47 +249,35 @@ static int __io_compat_msg_copy_hdr(struct io_kiocb *req, } #endif -static int __io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg, - struct sockaddr __user **addr, int ddir) +static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg, + struct user_msghdr *msg, int ddir) { struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); - struct user_msghdr msg; int ret; - if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) + if (copy_from_user(msg, sr->umsg, sizeof(*sr->umsg))) return -EFAULT; - ret = __copy_msghdr(&iomsg->msg, &msg, addr); - if (ret) - return ret; - if (req->flags & REQ_F_BUFFER_SELECT) { - if (msg.msg_iovlen == 0) { + if (msg->msg_iovlen == 0) { sr->len = iomsg->fast_iov[0].iov_len = 0; iomsg->fast_iov[0].iov_base = NULL; iomsg->free_iov = NULL; - } else if (msg.msg_iovlen > 1) { + } else if (msg->msg_iovlen > 1) { return -EINVAL; } else { - if (copy_from_user(iomsg->fast_iov, msg.msg_iov, - sizeof(*msg.msg_iov))) + if (copy_from_user(iomsg->fast_iov, msg->msg_iov, + sizeof(*msg->msg_iov))) return -EFAULT; sr->len = iomsg->fast_iov[0].iov_len; iomsg->free_iov = NULL; } - if (ddir == ITER_DEST && req->flags & REQ_F_APOLL_MULTISHOT) { - iomsg->namelen = msg.msg_namelen; - iomsg->controllen = msg.msg_controllen; - if (io_recvmsg_multishot_overflow(iomsg)) - return -EOVERFLOW; - } - return 0; } iomsg->free_iov = iomsg->fast_iov; - ret = __import_iovec(ddir, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, + ret = __import_iovec(ddir, msg->msg_iov, msg->msg_iovlen, UIO_FASTIOV, &iomsg->free_iov, &iomsg->msg.msg_iter, false); if (unlikely(ret < 0)) return ret; @@ -324,30 +285,34 @@ static int __io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg return 0; } -static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg, - struct sockaddr __user **addr, int ddir) +static int io_sendmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) { + struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); + struct user_msghdr msg; + int ret; + iomsg->msg.msg_name = &iomsg->addr; iomsg->msg.msg_iter.nr_segs = 0; #ifdef CONFIG_COMPAT - if (req->ctx->compat) - return __io_compat_msg_copy_hdr(req, iomsg, addr, ddir); -#endif + if (unlikely(req->ctx->compat)) { + struct compat_msghdr cmsg; - return __io_msg_copy_hdr(req, iomsg, addr, ddir); -} + ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_SOURCE); + if (unlikely(ret)) + return ret; -static int io_sendmsg_copy_hdr(struct io_kiocb *req, - struct io_async_msghdr *iomsg) -{ - struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); - int ret; + return __get_compat_msghdr(&iomsg->msg, &cmsg, NULL); + } +#endif - ret = io_msg_copy_hdr(req, iomsg, NULL, ITER_SOURCE); - if (ret) + ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_SOURCE); + if (unlikely(ret)) return ret; + ret = __copy_msghdr(&iomsg->msg, &msg, NULL); + /* save msg_control as sys_sendmsg() overwrites it */ sr->msg_control = iomsg->msg.msg_control_user; return ret; @@ -569,10 +534,66 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags) return IOU_OK; } +static int io_recvmsg_mshot_prep(struct io_kiocb *req, + struct io_async_msghdr *iomsg, + size_t namelen, size_t controllen) +{ + if ((req->flags & (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) == + (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) { + int hdr; + + if (unlikely(namelen < 0)) + return -EOVERFLOW; + if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), + namelen, &hdr)) + return -EOVERFLOW; + if (check_add_overflow(hdr, (int)controllen, &hdr)) + return -EOVERFLOW; + + iomsg->namelen = namelen; + iomsg->controllen = controllen; + return 0; + } + + return 0; +} + static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg) { - return io_msg_copy_hdr(req, iomsg, &iomsg->uaddr, ITER_DEST); + struct user_msghdr msg; + int ret; + + iomsg->msg.msg_name = &iomsg->addr; + iomsg->msg.msg_iter.nr_segs = 0; + +#ifdef CONFIG_COMPAT + if (unlikely(req->ctx->compat)) { + struct compat_msghdr cmsg; + + ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_DEST); + if (unlikely(ret)) + return ret; + + ret = __get_compat_msghdr(&iomsg->msg, &cmsg, &iomsg->uaddr); + if (unlikely(ret)) + return ret; + + return io_recvmsg_mshot_prep(req, iomsg, cmsg.msg_namelen, + cmsg.msg_controllen); + } +#endif + + ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_DEST); + if (unlikely(ret)) + return ret; + + ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); + if (unlikely(ret)) + return ret; + + return io_recvmsg_mshot_prep(req, iomsg, msg.msg_namelen, + msg.msg_controllen); } int io_recvmsg_prep_async(struct io_kiocb *req) -- 2.43.0