From patchwork Thu Feb 17 01:21:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jakub Kicinski X-Patchwork-Id: 12749213 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 3450CC433EF for ; Thu, 17 Feb 2022 01:21:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230203AbiBQBVo (ORCPT ); Wed, 16 Feb 2022 20:21:44 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:48220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230173AbiBQBVn (ORCPT ); Wed, 16 Feb 2022 20:21:43 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 512E1C79; Wed, 16 Feb 2022 17:21:27 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A0785616D2; Thu, 17 Feb 2022 01:21:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8492C340F1; Thu, 17 Feb 2022 01:21:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645060886; bh=PyfBm3JdbqZgg6lEYzHxWbG1mDXoWMsCqP0jN55ZWaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mtNJojPtKoq8pmHhOOjdVgVbQD71b+SR4H/IwoHiLsDMgBemQQFbXhNIv+avIz1PV 3vuVmwNruRiyXcB2MOO7GQEbIiRmVXMYS+RNTcF0NBeJgdXaMbbBpjJpiQKRpHwWxU HmKY6suo70GLVpl7sRSQVns/IJScgxFUPyGzF1j884Du694iLvxtMypen+blPUWDF7 DMyAuvu7r3llbow7zrL+/LExnKkI4VPh1fv0CX8WFt0wH0EcQw3XiaeReN2j6RAU6k UVy9ZUhhEuZAR5noxhc1t/hxObVkjQr+usltu9cc/kpuzQ03b86RgPR74sQbzeDkTf HGwjLcglvVenQ== From: Jakub Kicinski To: davem@davemloft.net Cc: netdev@vger.kernel.org, willemb@google.com, lorenzo@google.com, maze@google.com, dsahern@kernel.org, yoshfuji@linux-ipv6.org, shuah@kernel.org, linux-kselftest@vger.kernel.org, Jakub Kicinski Subject: [PATCH net-next 1/5] net: ping6: support setting basic SOL_IPV6 options via cmsg Date: Wed, 16 Feb 2022 17:21:16 -0800 Message-Id: <20220217012120.61250-2-kuba@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220217012120.61250-1-kuba@kernel.org> References: <20220217012120.61250-1-kuba@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Support setting IPV6_HOPLIMIT, IPV6_TCLASS, IPV6_DONTFRAG during sendmsg via SOL_IPV6 cmsgs. tclass and dontfrag are init'ed from struct ipv6_pinfo in ipcm6_init_sk(), while hlimit is inited to -1, so we need to handle it being populated via cmsg explicitly. Leave extension headers and flowlabel unimplemented. Those are slightly more laborious to test and users seem to primarily care about IPV6_TCLASS. Signed-off-by: Jakub Kicinski --- net/ipv6/ip6_output.c | 1 + net/ipv6/ping.c | 21 ++++++++++++++++----- 2 files changed, 17 insertions(+), 5 deletions(-) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 0c6c971ce0a5..3286b64ec03d 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1487,6 +1487,7 @@ static int __ip6_append_data(struct sock *sk, if (cork->length + length > mtu - headersize && ipc6->dontfrag && (sk->sk_protocol == IPPROTO_UDP || + sk->sk_protocol == IPPROTO_ICMPV6 || sk->sk_protocol == IPPROTO_RAW)) { ipv6_local_rxpmtu(sk, fl6, mtu - headersize + sizeof(struct ipv6hdr)); diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c index d5544cf67ffe..ff033d16549e 100644 --- a/net/ipv6/ping.c +++ b/net/ipv6/ping.c @@ -101,11 +101,21 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) ipc6.sockc.tsflags = sk->sk_tsflags; ipc6.sockc.mark = sk->sk_mark; - err = sock_cmsg_send(sk, msg, &ipc6.sockc); - if (err) - return err; + if (msg->msg_controllen) { + struct ipv6_txoptions opt = {}; + + opt.tot_len = sizeof(opt); + ipc6.opt = &opt; - /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ + err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); + if (err < 0) + return err; + + /* Changes to txoptions and flow info are not implemented, yet. + * Drop the options, fl6 is wiped below. + */ + ipc6.opt = NULL; + } memset(&fl6, 0, sizeof(fl6)); @@ -140,7 +150,8 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) pfh.wcheck = 0; pfh.family = AF_INET6; - ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); + if (ipc6.hlimit < 0) + ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); lock_sock(sk); err = ip6_append_data(sk, ping_getfrag, &pfh, len,