From patchwork Thu Jul 23 07:49:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kurt Kanzenbach X-Patchwork-Id: 1334584 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=luIJcVzc; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=4tyMIbsR; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BC4JR5VF0z9sR4 for ; Thu, 23 Jul 2020 17:50:47 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727860AbgGWHup (ORCPT ); Thu, 23 Jul 2020 03:50:45 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:55928 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726603AbgGWHun (ORCPT ); Thu, 23 Jul 2020 03:50:43 -0400 From: Kurt Kanzenbach DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1595490641; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YsxNfI9ThCCy8NI8e3vdNLXtuNrsksklUaXTlwtOxxA=; b=luIJcVzcKIgZkJjQYPUDzNmQoV3Sf+D6NSR2YdUo/j3BErhdhNTJeGNFalcFwzc76cYjqw 6cEJp8bnApMkUXgSh3BH+nNn6i2jjOhJAQW/UV66lVBFiV2TEaSqIe1PJUZ0Df7pJEyuRY 0t0AS8FyiLELr0r5DXsVf05Vm8RzefO17Mzv/wxYRzGnMr5FsjENyEbydWitr3t0Gh9zmV h4jiidE23I+cDWeMJ/nSnYXTxNn/RgRF25ucJ1qO3WmGj2evxmfsRKCNOEWLv2Oz5TFRR0 uSNXFTFeKzp8LfModqgyEJ0Oh15RiYflyAoLdPtE2hZcwZQOWp++idCHo7ACrQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1595490641; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YsxNfI9ThCCy8NI8e3vdNLXtuNrsksklUaXTlwtOxxA=; b=4tyMIbsRkZ/vk1DXLJPagKERMVSStVhReyc9UkCOwHse+hZFFIne2lWYXi9ThttLYpOAmR DVMUEUeGLuB2i2BQ== To: Andrew Lunn , Vivien Didelot , Florian Fainelli , Richard Cochran Cc: "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, Kurt Kanzenbach Subject: [PATCH v1 1/2] ptp: Add generic ptp v2 header parsing function Date: Thu, 23 Jul 2020 09:49:45 +0200 Message-Id: <20200723074946.14253-2-kurt@linutronix.de> In-Reply-To: <20200723074946.14253-1-kurt@linutronix.de> References: <20200723074946.14253-1-kurt@linutronix.de> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Reason: A lot of the ptp drivers - which implement hardware time stamping - need specific fields such as the sequence id from the ptp v2 header. Currently all drivers implement that themselves. Introduce a generic function to retrieve a pointer to the start of the ptp v2 header. Signed-off-by: Kurt Kanzenbach --- include/linux/ptp_classify.h | 38 ++++++++++++++++++++++++++++++++++++ net/core/ptp_classifier.c | 30 ++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h index dd00fa41f7e7..3370f402a503 100644 --- a/include/linux/ptp_classify.h +++ b/include/linux/ptp_classify.h @@ -44,6 +44,30 @@ #define OFF_IHL 14 #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) +struct clock_identity { + u8 id[8]; +} __packed; + +struct port_identity { + struct clock_identity clock_identity; + __be16 port_number; +} __packed; + +struct ptp_header { + u8 tsmt; /* transportSpecific | messageType */ + u8 ver; /* reserved | versionPTP */ + __be16 message_length; + u8 domain_number; + u8 reserved1; + u8 flag_field[2]; + __be64 correction; + __be32 reserved2; + struct port_identity source_port_identity; + __be16 sequence_id; + u8 control; + u8 log_message_interval; +} __packed; + #if defined(CONFIG_NET_PTP_CLASSIFY) /** * ptp_classify_raw - classify a PTP packet @@ -57,6 +81,15 @@ */ unsigned int ptp_classify_raw(const struct sk_buff *skb); +/** + * ptp_parse_header - Get pointer to the PTP v2 header + * @skb: packet buffer + * @type: type of the packet (see ptp_classify_raw()) + * + * Return: Pointer to the ptp v2 header or NULL if not found + */ +struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type); + void __init ptp_classifier_init(void); #else static inline void ptp_classifier_init(void) @@ -66,5 +99,10 @@ static inline unsigned int ptp_classify_raw(struct sk_buff *skb) { return PTP_CLASS_NONE; } +static struct ptp_header *ptp_parse_header(struct sk_buff *skb, + unsigned int type) +{ + return NULL; +} #endif #endif /* _PTP_CLASSIFY_H_ */ diff --git a/net/core/ptp_classifier.c b/net/core/ptp_classifier.c index d964a5147f22..dc12338bf3cd 100644 --- a/net/core/ptp_classifier.c +++ b/net/core/ptp_classifier.c @@ -107,6 +107,36 @@ unsigned int ptp_classify_raw(const struct sk_buff *skb) } EXPORT_SYMBOL_GPL(ptp_classify_raw); +struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type) +{ + u8 *data = skb_mac_header(skb); + unsigned int offset = 0; + + if (type & PTP_CLASS_VLAN) + offset += VLAN_HLEN; + + switch (type & PTP_CLASS_PMASK) { + case PTP_CLASS_IPV4: + offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN; + break; + case PTP_CLASS_IPV6: + offset += ETH_HLEN + IP6_HLEN + UDP_HLEN; + break; + case PTP_CLASS_L2: + offset += ETH_HLEN; + break; + default: + return NULL; + } + + /* Ensure that the entire header is present in this packet. */ + if (skb->len + ETH_HLEN < offset + sizeof(struct ptp_header)) + return NULL; + + return (struct ptp_header *)(data + offset); +} +EXPORT_SYMBOL_GPL(ptp_parse_header); + void __init ptp_classifier_init(void) { static struct sock_filter ptp_filter[] __initdata = {