From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KNv3I-0004JM-6o for qemu-devel@nongnu.org; Tue, 29 Jul 2008 15:40:08 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KNv3G-0004I7-OD for qemu-devel@nongnu.org; Tue, 29 Jul 2008 15:40:07 -0400 Received: from [199.232.76.173] (port=44144 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KNv3G-0004Hz-AM for qemu-devel@nongnu.org; Tue, 29 Jul 2008 15:40:06 -0400 Received: from savannah.gnu.org ([199.232.41.3]:47368 helo=sv.gnu.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KNv3G-0004Qa-6u for qemu-devel@nongnu.org; Tue, 29 Jul 2008 15:40:06 -0400 Received: from cvs.savannah.gnu.org ([199.232.41.69]) by sv.gnu.org with esmtp (Exim 4.63) (envelope-from ) id 1KNv3E-0002GF-Mm for qemu-devel@nongnu.org; Tue, 29 Jul 2008 19:40:04 +0000 Received: from aliguori by cvs.savannah.gnu.org with local (Exim 4.63) (envelope-from ) id 1KNv3E-0002Fo-B0 for qemu-devel@nongnu.org; Tue, 29 Jul 2008 19:40:04 +0000 MIME-Version: 1.0 Errors-To: aliguori Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Anthony Liguori Message-Id: Date: Tue, 29 Jul 2008 19:40:04 +0000 Subject: [Qemu-devel] [4971] Add IP checksumming functions to qemu (Gerd Hoffmann) Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Revision: 4971 http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=4971 Author: aliguori Date: 2008-07-29 19:40:04 +0000 (Tue, 29 Jul 2008) Log Message: ----------- Add IP checksumming functions to qemu (Gerd Hoffmann) This can be shared between the e1000, virtio-net, and xennet. Signed-off-by: Gerd Hoffmann Signed-off-by: Anthony Liguori Modified Paths: -------------- trunk/Makefile.target trunk/net.h Added Paths: ----------- trunk/net-checksum.c Modified: trunk/Makefile.target =================================================================== --- trunk/Makefile.target 2008-07-29 18:11:20 UTC (rev 4970) +++ trunk/Makefile.target 2008-07-29 19:40:04 UTC (rev 4971) @@ -472,7 +472,7 @@ # System emulator target ifndef CONFIG_USER_ONLY -OBJS=vl.o osdep.o monitor.o pci.o loader.o isa_mmio.o machine.o +OBJS=vl.o osdep.o monitor.o pci.o loader.o isa_mmio.o machine.o net-checksum.o ifdef CONFIG_WIN32 OBJS+=block-raw-win32.o else Added: trunk/net-checksum.c =================================================================== --- trunk/net-checksum.c (rev 0) +++ trunk/net-checksum.c 2008-07-29 19:40:04 UTC (rev 4971) @@ -0,0 +1,87 @@ +/* + * IP checksumming functions. + * (c) 2008 Gerd Hoffmann + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; under version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "hw/hw.h" +#include "net.h" + +#define PROTO_TCP 6 +#define PROTO_UDP 17 + +uint32_t net_checksum_add(int len, uint8_t *buf) +{ + uint32_t sum = 0; + int i; + + for (i = 0; i < len; i++) { + if (i & 1) + sum += (uint32_t)buf[i]; + else + sum += (uint32_t)buf[i] << 8; + } + return sum; +} + +uint16_t net_checksum_finish(uint32_t sum) +{ + while (sum>>16) + sum = (sum & 0xFFFF)+(sum >> 16); + return ~sum; +} + +uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto, + uint8_t *addrs, uint8_t *buf) +{ + uint32_t sum = 0; + + sum += net_checksum_add(length, buf); // payload + sum += net_checksum_add(8, addrs); // src + dst address + sum += proto + length; // protocol & length + return net_checksum_finish(sum); +} + +void net_checksum_calculate(uint8_t *data, int length) +{ + int hlen, plen, proto, csum_offset; + uint16_t csum; + + if ((data[14] & 0xf0) != 0x40) + return; /* not IPv4 */ + hlen = (data[14] & 0x0f) * 4; + plen = (data[16] << 8 | data[17]) - hlen; + proto = data[23]; + + switch (proto) { + case PROTO_TCP: + csum_offset = 16; + break; + case PROTO_UDP: + csum_offset = 6; + break; + default: + return; + } + + if (plen < csum_offset+2) + return; + + data[14+hlen+csum_offset] = 0; + data[14+hlen+csum_offset+1] = 0; + csum = net_checksum_tcpudp(plen, proto, data+14+12, data+14+hlen); + data[14+hlen+csum_offset] = csum >> 8; + data[14+hlen+csum_offset+1] = csum & 0xff; +} Modified: trunk/net.h =================================================================== --- trunk/net.h 2008-07-29 18:11:20 UTC (rev 4970) +++ trunk/net.h 2008-07-29 19:40:04 UTC (rev 4971) @@ -48,4 +48,11 @@ extern int nb_nics; extern NICInfo nd_table[MAX_NICS]; +/* checksumming functions (net-checksum.c) */ +uint32_t net_checksum_add(int len, uint8_t *buf); +uint16_t net_checksum_finish(uint32_t sum); +uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto, + uint8_t *addrs, uint8_t *buf); +void net_checksum_calculate(uint8_t *data, int length); + #endif