From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 37D3A1EBA0A; Tue, 15 Oct 2024 12:12:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728994348; cv=none; b=b4jAr+0dZVKmq2F4yySTk3fVG6/4UdxnJCt+X11O6QtTKGUGZVBZEzUVll9OKqzFMNSx8+4ApDrswQ0BjLMhbG0eP0TPXqr6QqTD33gzzakt5ewfXo4U2+TFHIDeER9LGoLPSO7F0tvzlXaktYtjVVVqH/K7vRqlnRhKmB/Rc5A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728994348; c=relaxed/simple; bh=zcgAUocq4r0n2kQmhELcvhW8B3oXc9bvEa+LA5t7LEU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uDfYD8eRcIu1nCW9hocStwMZZoHY5tOKG5FDlSnEeCvdu7r7nF/AtuosKxudlrYwvp2NuKkbAgMkZId4/JUu8ETAy5maTS2Ce12wHYT/GerHDO+3yKV21Zlu2azThV2LJ5OC3b0uqM03bhI2bQ/vidNNPdN+kicXLlMDjR5fLeg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=z7pbu+zc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="z7pbu+zc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9353BC4CEC6; Tue, 15 Oct 2024 12:12:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728994348; bh=zcgAUocq4r0n2kQmhELcvhW8B3oXc9bvEa+LA5t7LEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z7pbu+zcxk+dNkoYH47dTQUvajgUO1iUTTvHBuhFU1i07HP+HDa3Tpnd5a3R32Bjx TyQSuwQ0KY2Tq4tAgKZr8NSqoUQC13RJNQDXkSihU/yy80lv5CtRhRrFwXE7m6T5MY 1CdnFqaheyfhMmcHTNNahpSnkYS+JloH5jAA2/6g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kuniyuki Iwashima , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 655/691] rtnetlink: Add bulk registration helpers for rtnetlink message handlers. Date: Tue, 15 Oct 2024 13:30:03 +0200 Message-ID: <20241015112506.322833044@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241015112440.309539031@linuxfoundation.org> References: <20241015112440.309539031@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuniyuki Iwashima [ Upstream commit 07cc7b0b942bf55ef1a471470ecda8d2a6a6541f ] Before commit addf9b90de22 ("net: rtnetlink: use rcu to free rtnl message handlers"), once rtnl_msg_handlers[protocol] was allocated, the following rtnl_register_module() for the same protocol never failed. However, after the commit, rtnl_msg_handler[protocol][msgtype] needs to be allocated in each rtnl_register_module(), so each call could fail. Many callers of rtnl_register_module() do not handle the returned error, and we need to add many error handlings. To handle that easily, let's add wrapper functions for bulk registration of rtnetlink message handlers. Signed-off-by: Kuniyuki Iwashima Signed-off-by: Paolo Abeni Stable-dep-of: d51705614f66 ("mctp: Handle error of rtnl_register_module().") Signed-off-by: Sasha Levin --- include/net/rtnetlink.h | 17 +++++++++++++++++ net/core/rtnetlink.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h index c9d3ae92c9321..dcb1c92e69879 100644 --- a/include/net/rtnetlink.h +++ b/include/net/rtnetlink.h @@ -20,6 +20,15 @@ enum rtnl_kinds { RTNL_KIND_SET }; +struct rtnl_msg_handler { + struct module *owner; + int protocol; + int msgtype; + rtnl_doit_func doit; + rtnl_dumpit_func dumpit; + int flags; +}; + void rtnl_register(int protocol, int msgtype, rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); int rtnl_register_module(struct module *owner, int protocol, int msgtype, @@ -27,6 +36,14 @@ int rtnl_register_module(struct module *owner, int protocol, int msgtype, int rtnl_unregister(int protocol, int msgtype); void rtnl_unregister_all(int protocol); +int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n); +void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n); + +#define rtnl_register_many(handlers) \ + __rtnl_register_many(handlers, ARRAY_SIZE(handlers)) +#define rtnl_unregister_many(handlers) \ + __rtnl_unregister_many(handlers, ARRAY_SIZE(handlers)) + static inline int rtnl_msg_family(const struct nlmsghdr *nlh) { if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 8fc86d1edf561..24795110b2ff3 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -348,6 +348,35 @@ void rtnl_unregister_all(int protocol) } EXPORT_SYMBOL_GPL(rtnl_unregister_all); +int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n) +{ + const struct rtnl_msg_handler *handler; + int i, err; + + for (i = 0, handler = handlers; i < n; i++, handler++) { + err = rtnl_register_internal(handler->owner, handler->protocol, + handler->msgtype, handler->doit, + handler->dumpit, handler->flags); + if (err) { + __rtnl_unregister_many(handlers, i); + break; + } + } + + return err; +} +EXPORT_SYMBOL_GPL(__rtnl_register_many); + +void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n) +{ + const struct rtnl_msg_handler *handler; + int i; + + for (i = n - 1, handler = handlers + n - 1; i >= 0; i--, handler--) + rtnl_unregister(handler->protocol, handler->msgtype); +} +EXPORT_SYMBOL_GPL(__rtnl_unregister_many); + static LIST_HEAD(link_ops); static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) -- 2.43.0