From patchwork Thu Jan 27 16:39:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marcin Szycik X-Patchwork-Id: 12727066 X-Patchwork-Delegate: kuba@kernel.org 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 13D83C4332F for ; Thu, 27 Jan 2022 16:42:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243916AbiA0QmR (ORCPT ); Thu, 27 Jan 2022 11:42:17 -0500 Received: from mga01.intel.com ([192.55.52.88]:39997 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244018AbiA0QmP (ORCPT ); Thu, 27 Jan 2022 11:42:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1643301735; x=1674837735; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=/el1qt9lc5Co2J+eHPhJkacvEleK1FnA+se1S8lEmhc=; b=WDr/hvqdgMSucwNLzNuCVger8FzuSPgtEZc48Z5jt4KTXHfeIU/7Bx0l ockbiSkaGV1e1JGja3Agh++5jkx5f5UqipKRsWIHA3fxIysbSDPWj2kik W7iVsx01YV+6VOrDgTYwqqEMvzCZhGZilZxg3P585lhL6fhHh11iTy7Ha dn2n7Jl0OF92Ah0nEODdCgIpbOttP71Mcou15ERMhiN1F0yt7KyUpNfpa i25UpDjpOXz4wrWUkj2mTZyxYeNNRCY4zx9o+kxjVbRrTTmuujQU0vXtU xa6wvjj1z1SZeqnNnMH9g0BlYVBtm87CeM99RRsQlGbxgL4YXPlSVN6/g g==; X-IronPort-AV: E=McAfee;i="6200,9189,10239"; a="271363588" X-IronPort-AV: E=Sophos;i="5.88,321,1635231600"; d="scan'208";a="271363588" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2022 08:42:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,321,1635231600"; d="scan'208";a="563849956" Received: from irvmail001.ir.intel.com ([10.43.11.63]) by orsmga001.jf.intel.com with ESMTP; 27 Jan 2022 08:41:58 -0800 Received: from switcheroo.igk.intel.com (switcheroo.igk.intel.com [172.22.229.137]) by irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id 20RGfvHH011366; Thu, 27 Jan 2022 16:41:57 GMT From: Marcin Szycik To: netdev@vger.kernel.org Cc: michal.swiatkowski@linux.intel.com, wojciech.drewek@intel.com, davem@davemloft.net, kuba@kernel.org, pablo@netfilter.org, laforge@gnumonks.org, osmocom-net-gprs@lists.osmocom.org Subject: [RFC PATCH net-next v3 1/5] gtp: Allow to create GTP device without FDs Date: Thu, 27 Jan 2022 17:39:00 +0100 Message-Id: <20220127163900.374645-1-marcin.szycik@linux.intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220127163749.374283-1-marcin.szycik@linux.intel.com> References: <20220127163749.374283-1-marcin.szycik@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC From: Wojciech Drewek Currently, when the user wants to create GTP device, he has to provide file handles to the sockets created in userspace (IFLA_GTP_FD0, IFLA_GTP_FD1). This behaviour is not ideal, considering the option of adding support for GTP device creation through ip link. Ip link application is not a good place to create such sockets. This patch allows to create GTP device without providing IFLA_GTP_FD0 and IFLA_GTP_FD1 arguments. If the user does not provide file handles to the sockets, then GTP module takes care of creating UDP sockets by itself. Sockets are created with the commonly known UDP ports used for GTP protocol (GTP0_PORT and GTP1U_PORT). In this case we don't have to provide encap_destroy because no extra deinitialization is needed, everything is covered by udp_tunnel_sock_release. Signed-off-by: Wojciech Drewek --- drivers/net/gtp.c | 74 ++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 67 insertions(+), 7 deletions(-) diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index 24e5c54d06c1..a2ad0af913cb 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -66,8 +66,10 @@ struct gtp_dev { struct sock *sk0; struct sock *sk1u; + u8 sk_created; struct net_device *dev; + struct net *net; unsigned int role; unsigned int hash_size; @@ -320,8 +322,16 @@ static void gtp_encap_disable_sock(struct sock *sk) static void gtp_encap_disable(struct gtp_dev *gtp) { - gtp_encap_disable_sock(gtp->sk0); - gtp_encap_disable_sock(gtp->sk1u); + if (gtp->sk_created) { + udp_tunnel_sock_release(gtp->sk0->sk_socket); + udp_tunnel_sock_release(gtp->sk1u->sk_socket); + gtp->sk_created = false; + gtp->sk0 = NULL; + gtp->sk1u = NULL; + } else { + gtp_encap_disable_sock(gtp->sk0); + gtp_encap_disable_sock(gtp->sk1u); + } } /* UDP encapsulation receive handler. See net/ipv4/udp.c. @@ -664,9 +674,6 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, struct gtp_net *gn; int hashsize, err; - if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) - return -EINVAL; - gtp = netdev_priv(dev); if (!data[IFLA_GTP_PDP_HASHSIZE]) { @@ -677,6 +684,8 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, hashsize = 1024; } + gtp->net = src_net; + err = gtp_hashtable_new(gtp, hashsize); if (err < 0) return err; @@ -844,6 +853,38 @@ static struct sock *gtp_encap_enable_socket(int fd, int type, return sk; } +static struct sock *gtp_encap_create_sock(int type, struct gtp_dev *gtp) +{ + struct udp_tunnel_sock_cfg tuncfg = {}; + struct udp_port_cfg udp_conf = { + .local_ip.s_addr = htonl(INADDR_ANY), + .family = AF_INET, + }; + struct net *net = gtp->net; + struct socket *sock; + int err; + + if (type == UDP_ENCAP_GTP0) + udp_conf.local_udp_port = GTP0_PORT; + else if (type == UDP_ENCAP_GTP1U) + udp_conf.local_udp_port = GTP1U_PORT; + else + return ERR_PTR(-EINVAL); + + err = udp_sock_create(net, &udp_conf, &sock); + if (err) + return ERR_PTR(err); + + tuncfg.sk_user_data = gtp; + tuncfg.encap_type = type; + tuncfg.encap_rcv = gtp_encap_recv; + tuncfg.encap_destroy = NULL; + + setup_udp_tunnel_sock(net, sock, &tuncfg); + + return sock->sk; +} + static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) { struct sock *sk1u = NULL; @@ -868,11 +909,30 @@ static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) } } + if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) { + sk0 = gtp_encap_create_sock(UDP_ENCAP_GTP0, gtp); + if (IS_ERR(sk0)) + return PTR_ERR(sk0); + + sk1u = gtp_encap_create_sock(UDP_ENCAP_GTP1U, gtp); + if (IS_ERR(sk1u)) { + udp_tunnel_sock_release(sk0->sk_socket); + return PTR_ERR(sk1u); + } + gtp->sk_created = true; + } + if (data[IFLA_GTP_ROLE]) { role = nla_get_u32(data[IFLA_GTP_ROLE]); if (role > GTP_ROLE_SGSN) { - gtp_encap_disable_sock(sk0); - gtp_encap_disable_sock(sk1u); + if (gtp->sk_created) { + udp_tunnel_sock_release(sk0->sk_socket); + udp_tunnel_sock_release(sk1u->sk_socket); + gtp->sk_created = false; + } else { + gtp_encap_disable_sock(sk0); + gtp_encap_disable_sock(sk1u); + } return -EINVAL; } }