Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751829AbZL1OkU (ORCPT ); Mon, 28 Dec 2009 09:40:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751799AbZL1OkS (ORCPT ); Mon, 28 Dec 2009 09:40:18 -0500 Received: from mailgw.kvados.cz ([194.213.53.146]:19217 "EHLO mailgw.kvados.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751787AbZL1OkQ (ORCPT ); Mon, 28 Dec 2009 09:40:16 -0500 From: Milan Dadok To: , , CC: , Subject: [PATCH] 1/1 net: packet: Keep 802.1Q VLAN tag in packet on SOCK_DGRAM socket Date: Mon, 28 Dec 2009 15:34:49 +0100 Message-ID: <004501ca87ca$e9815030$bc83f090$@name> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcqHyukDHcnH4PKNRxOAB5G+QnAFoA== Content-Language: cs Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2476 Lines: 61 Keep 802.1Q VLAN tag on non HW vlan accelerated network card received to SOCK_DGRAM socket. Signed-off-by: Milan Dadok --- diff -urN af_packet.c.orig af_packet.c --- af_packet.c.orig 2009-12-26 12:34:15.000000000 +0100 +++ af_packet.c 2009-12-28 14:31:14.000000000 +0100 @@ -57,6 +57,8 @@ #include #include #include +#include +#include "../8021q/vlan.h" #include #include #include @@ -680,8 +682,28 @@ if (sk->sk_type != SOCK_DGRAM) skb_push(skb, skb->data - skb_mac_header(skb)); else if (skb->pkt_type == PACKET_OUTGOING) { - /* Special case: outgoing packets have ll header at head */ - skb_pull(skb, skb_network_offset(skb)); + /* Special case: outgoing packets have ll header at head + * but we must leave 802.1Q encapsulation etc. (only for non HW vlan accelerated) + * encasulation len = actual header_len minus hard_header_len + * packet outgoing from vlan1@eth0 on eth0 have skb_network_offset=18, hard_header_len=14 + */ + int hard_header_len; + struct net_device *pdev; + hard_header_len = dev->hard_header_len; + pdev = dev; + /* if dev is vlan device, hard_header_len contains 802.1Q encap, subtract it, recursively + * ie. vlan3@vlan2@vlan1@eth0 + */ + while (is_vlan_dev(pdev)) { + struct net_device *real_dev = vlan_dev_info(pdev)->real_dev; + hard_header_len -= pdev->hard_header_len - real_dev->hard_header_len; + pdev = real_dev; + } + + skb_pull(skb, skb_network_offset(skb) - + (skb_network_offset(skb) - hard_header_len>0 ? skb_network_offset(skb) - hard_header_len : 0)); } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/