From patchwork Mon Jan 30 16:32:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Schultz X-Patchwork-Id: 721588 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.osmocom.org (lists.osmocom.org [IPv6:2a01:4f8:191:444b::2:7]) by ozlabs.org (Postfix) with ESMTP id 3vBw0c0TPrz9sCM for ; Tue, 31 Jan 2017 03:32:32 +1100 (AEDT) Received: from lists.osmocom.org (lists.osmocom.org [144.76.43.76]) by lists.osmocom.org (Postfix) with ESMTP id A4FD029650; Mon, 30 Jan 2017 16:32:25 +0000 (UTC) Authentication-Results: lists.osmocom.org; dmarc=none header.from=tpip.net X-Original-To: openbsc@lists.osmocom.org Delivered-To: openbsc@lists.osmocom.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=92.43.49.48; helo=mail.tpip.net; envelope-from=aschultz@tpip.net; receiver=openbsc@lists.osmocom.org Authentication-Results: lists.osmocom.org; dmarc=none header.from=tpip.net Received: from mail.tpip.net (mail.tpip.net [92.43.49.48]) by lists.osmocom.org (Postfix) with ESMTP id D496E295DA for ; Mon, 30 Jan 2017 16:32:05 +0000 (UTC) Received: from office.tpip.net (unknown [153.92.65.89]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.tpip.net (Postfix) with ESMTPS id B347B4F40A; Mon, 30 Jan 2017 16:32:05 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by office.tpip.net (Postfix) with ESMTP id 89E82A2CDE; Mon, 30 Jan 2017 17:32:05 +0100 (CET) Received: from office.tpip.net ([127.0.0.1]) by localhost (office.tpip.net [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id DU7cji8YNR-G; Mon, 30 Jan 2017 17:32:05 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by office.tpip.net (Postfix) with ESMTP id 0CAA3A2CDD; Mon, 30 Jan 2017 17:32:05 +0100 (CET) X-Virus-Scanned: amavisd-new at tpip.net Received: from office.tpip.net ([127.0.0.1]) by localhost (office.tpip.net [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id VqIHKDDuqGN2; Mon, 30 Jan 2017 17:32:04 +0100 (CET) Received: from alice.tpip.net (pd95c9392.dip0.t-ipconnect.de [217.92.147.146]) by office.tpip.net (Postfix) with ESMTPSA id BACFBA2CE0; Mon, 30 Jan 2017 17:32:04 +0100 (CET) From: Andreas Schultz To: Pablo Neira Subject: [PATCH 6/6] gtp: consolidate gtp socket rx path Date: Mon, 30 Jan 2017 17:32:00 +0100 Message-Id: <20170130163200.17070-7-aschultz@tpip.net> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20170130163200.17070-1-aschultz@tpip.net> References: <20170130163200.17070-1-aschultz@tpip.net> X-BeenThere: openbsc@lists.osmocom.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of OpenBSC, OsmoBSC, OsmoNITB, OsmoCSCN" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: netdev@vger.kernel.org, Lionel Gauthier , openbsc@lists.osmocom.org Errors-To: openbsc-bounces@lists.osmocom.org Sender: "OpenBSC" Add network device to gtp context in preparation for splitting the TEID from the network device. Use this to rework the socker rx path. Move the common RX part of v0 and v1 into a helper. Also move the final rx part into that helper as well. Signed-off-by: Andreas Schultz --- drivers/net/gtp.c | 92 ++++++++++++++++++++++++++++--------------------------- 1 file changed, 47 insertions(+), 45 deletions(-) diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index ff00597..9c31e83 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -58,6 +58,7 @@ struct pdp_ctx { struct in_addr ms_addr_ip4; struct in_addr sgsn_addr_ip4; + struct net_device *dev; struct sock *sk; atomic_t tx_seq; @@ -179,9 +180,42 @@ static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx *pctx, return false; } +static int gtp_rx(struct sk_buff *skb, struct pdp_ctx *pctx, unsigned int hdrlen) +{ + struct pcpu_sw_netstats *stats; + + if (!gtp_check_src_ms(skb, pctx, hdrlen)) { + pr_debug("No PDP ctx for this MS\n"); + return 1; + } + + /* Get rid of the GTP + UDP headers. */ + if (iptunnel_pull_header(skb, hdrlen, skb->protocol, + !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) + return -1; + + pr_debug("forwarding packet from GGSN to uplink\n"); + + /* Now that the UDP and the GTP header have been removed, set up the + * new network header. This is required by the upper layer to + * calculate the transport header. + */ + skb_reset_network_header(skb); + + skb->dev = pctx->dev; + + stats = this_cpu_ptr(pctx->dev->tstats); + u64_stats_update_begin(&stats->syncp); + stats->rx_packets++; + stats->rx_bytes += skb->len; + u64_stats_update_end(&stats->syncp); + + netif_rx(skb); + return 0; +} + /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ -static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, - bool xnet) +static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) { unsigned int hdrlen = sizeof(struct udphdr) + sizeof(struct gtp0_header); @@ -205,17 +239,10 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, return 1; } - if (!gtp_check_src_ms(skb, pctx, hdrlen)) { - netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); - return 1; - } - - /* Get rid of the GTP + UDP headers. */ - return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); + return gtp_rx(skb, pctx, hdrlen); } -static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, - bool xnet) +static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) { unsigned int hdrlen = sizeof(struct udphdr) + sizeof(struct gtp1_header); @@ -254,13 +281,7 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, return 1; } - if (!gtp_check_src_ms(skb, pctx, hdrlen)) { - netdev_dbg(gtp->dev, "No PDP ctx for this MS\n"); - return 1; - } - - /* Get rid of the GTP + UDP headers. */ - return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet); + return gtp_rx(skb, pctx, hdrlen); } static void gtp_encap_destroy(struct sock *sk) @@ -294,10 +315,8 @@ static void gtp_encap_disable(struct gtp_dev *gtp) */ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) { - struct pcpu_sw_netstats *stats; struct gtp_dev *gtp; - bool xnet; - int ret; + int ret = 0; gtp = rcu_dereference_sk_user_data(sk); if (!gtp) @@ -305,16 +324,14 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); - xnet = !net_eq(sock_net(sk), dev_net(gtp->dev)); - switch (udp_sk(sk)->encap_type) { case UDP_ENCAP_GTP0: netdev_dbg(gtp->dev, "received GTP0 packet\n"); - ret = gtp0_udp_encap_recv(gtp, skb, xnet); + ret = gtp0_udp_encap_recv(gtp, skb); break; case UDP_ENCAP_GTP1U: netdev_dbg(gtp->dev, "received GTP1U packet\n"); - ret = gtp1u_udp_encap_recv(gtp, skb, xnet); + ret = gtp1u_udp_encap_recv(gtp, skb); break; default: ret = -1; /* Shouldn't happen. */ @@ -323,33 +340,17 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) switch (ret) { case 1: netdev_dbg(gtp->dev, "pass up to the process\n"); - return 1; + break; case 0: - netdev_dbg(gtp->dev, "forwarding packet from GGSN to uplink\n"); break; case -1: netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); kfree_skb(skb); - return 0; + ret = 0; + break; } - /* Now that the UDP and the GTP header have been removed, set up the - * new network header. This is required by the upper layer to - * calculate the transport header. - */ - skb_reset_network_header(skb); - - skb->dev = gtp->dev; - - stats = this_cpu_ptr(gtp->dev->tstats); - u64_stats_update_begin(&stats->syncp); - stats->rx_packets++; - stats->rx_bytes += skb->len; - u64_stats_update_end(&stats->syncp); - - netif_rx(skb); - - return 0; + return ret; } static int gtp_dev_init(struct net_device *dev) @@ -930,6 +931,7 @@ static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk, sock_hold(sk); pctx->sk = sk; + pctx->dev = gtp->dev; ipv4_pdp_fill(pctx, info); atomic_set(&pctx->tx_seq, 0);