From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35021) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d1C1q-00031U-Un for qemu-devel@nongnu.org; Thu, 20 Apr 2017 09:21:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d1C1m-0007C7-Lg for qemu-devel@nongnu.org; Thu, 20 Apr 2017 09:21:46 -0400 Received: from 4.mo4.mail-out.ovh.net ([178.32.98.131]:43317) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d1C1m-00079y-FV for qemu-devel@nongnu.org; Thu, 20 Apr 2017 09:21:42 -0400 Received: from player159.ha.ovh.net (b9.ovh.net [213.186.33.59]) by mo4.mail-out.ovh.net (Postfix) with ESMTP id 07BF55FA97 for ; Thu, 20 Apr 2017 15:21:33 +0200 (CEST) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Date: Thu, 20 Apr 2017 15:21:15 +0200 Message-Id: <1492694475-18198-1-git-send-email-clg@kaod.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH] slirp: add checksum support to NC-SI backend List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jason Wang Cc: Samuel Thibault , Jan Kiszka , Gavin Shan , qemu-devel@nongnu.org, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= The checksum field of a NC-SI packet contains a value that may be included in each command and response. The verification is optional but the Linux driver does so when a non-zero value is provided. Let's extend the model to compute the checksum value and exercise a little more the Linux driver. See section "8.2.2.3 - 2's Complement Checksum Compensation" in the Network Controller Sideband Interface (NC-SI) Specification for more details. Signed-off-by: C=C3=A9dric Le Goater --- slirp/ncsi.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/slirp/ncsi.c b/slirp/ncsi.c index d12ba3e494b0..81c6bc5576d3 100644 --- a/slirp/ncsi.c +++ b/slirp/ncsi.c @@ -8,9 +8,23 @@ */ #include "qemu/osdep.h" #include "slirp.h" +#include "net/checksum.h" =20 #include "ncsi-pkt.h" =20 +static uint32_t ncsi_calculate_checksum(unsigned char *data, int len) +{ + uint32_t checksum =3D 0; + int i; + + for (i =3D 0; i < len; i +=3D 2) { + checksum +=3D (((uint32_t)data[i] << 8) | data[i + 1]); + } + + checksum =3D (~checksum + 1); + return checksum; +} + /* Get Capabilities */ static int ncsi_rsp_handler_gc(struct ncsi_rsp_pkt_hdr *rnh) { @@ -87,6 +101,9 @@ void ncsi_input(Slirp *slirp, const uint8_t *pkt, int = pkt_len) (ncsi_reply + ETH_HLEN); const struct ncsi_rsp_handler *handler =3D NULL; int i; + int ncsi_rsp_len =3D sizeof(*nh); + uint32_t checksum; + uint32_t *pchecksum; =20 memset(ncsi_reply, 0, sizeof(ncsi_reply)); =20 @@ -116,15 +133,19 @@ void ncsi_input(Slirp *slirp, const uint8_t *pkt, i= nt pkt_len) /* TODO: handle errors */ handler->handler(rnh); } + ncsi_rsp_len +=3D handler->payload; } else { rnh->common.length =3D 0; rnh->code =3D htons(NCSI_PKT_RSP_C_UNAVAILABLE); rnh->reason =3D htons(NCSI_PKT_RSP_R_UNKNOWN); } =20 - /* TODO: add a checksum at the end of the frame but the specs - * allows it to be zero */ + /* add a checksum at the end of the frame (the specs allows it to + * be zero */ + checksum =3D ncsi_calculate_checksum((unsigned char *) rnh, ncsi_rsp= _len); + pchecksum =3D (uint32_t *)((void *) rnh + ncsi_rsp_len); + *pchecksum =3D htonl(checksum); + ncsi_rsp_len +=3D 4; =20 - slirp_output(slirp->opaque, ncsi_reply, ETH_HLEN + sizeof(*nh) + - (handler ? handler->payload : 0) + 4); + slirp_output(slirp->opaque, ncsi_reply, ETH_HLEN + ncsi_rsp_len); } --=20 2.7.4