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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* NC-SI (Network Controller Sideband Interface) "echo" model
*
* Copyright (C) 2016-2018 IBM Corp.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "slirp.h"
#include "ncsi-pkt.h"
static uint32_t ncsi_calculate_checksum(uint8_t *data, int len)
{
uint32_t checksum = 0;
int i;
/*
* 32-bit unsigned sum of the NC-SI packet header and NC-SI packet
* payload interpreted as a series of 16-bit unsigned integer values.
*/
for (i = 0; i < len; i += 2) {
checksum += (((uint16_t) data[i]) << 8) + data[i+1];
}
checksum = (~checksum + 1);
return checksum;
}
/* Get Version ID */
static int ncsi_rsp_handler_gvi(Slirp *slirp, struct ncsi_rsp_pkt_hdr *rnh)
{
struct ncsi_rsp_gvi_pkt *rsp = (struct ncsi_rsp_gvi_pkt *)rnh;
rsp->ncsi_version = htonl(0xF1F0F000);
rsp->mf_id = htonl(slirp->mfr_id);
return 0;
}
/* Get Capabilities */
static int ncsi_rsp_handler_gc(Slirp *slirp, struct ncsi_rsp_pkt_hdr *rnh)
{
struct ncsi_rsp_gc_pkt *rsp = (struct ncsi_rsp_gc_pkt *)rnh;
rsp->cap = htonl(~0);
rsp->bc_cap = htonl(~0);
rsp->mc_cap = htonl(~0);
rsp->buf_cap = htonl(~0);
rsp->aen_cap = htonl(~0);
rsp->vlan_mode = 0xff;
rsp->uc_cnt = 2;
return 0;
}
/* Get Link status */
static int ncsi_rsp_handler_gls(Slirp *slirp, struct ncsi_rsp_pkt_hdr *rnh)
{
struct ncsi_rsp_gls_pkt *rsp = (struct ncsi_rsp_gls_pkt *)rnh;
rsp->status = htonl(0x1);
return 0;
}
/* Get Parameters */
static int ncsi_rsp_handler_gp(Slirp *slirp, struct ncsi_rsp_pkt_hdr *rnh)
{
struct ncsi_rsp_gp_pkt *rsp = (struct ncsi_rsp_gp_pkt *)rnh;
/* no MAC address filters or VLAN filters on the channel */
rsp->mac_cnt = 0;
rsp->mac_enable = 0;
rsp->vlan_cnt = 0;
rsp->vlan_enable = 0;
return 0;
}
static const struct ncsi_rsp_handler {
unsigned char type;
int payload;
int (*handler)(Slirp *slirp, struct ncsi_rsp_pkt_hdr *rnh);
} ncsi_rsp_handlers[] = { { NCSI_PKT_RSP_CIS, 4, NULL },
{ NCSI_PKT_RSP_SP, 4, NULL },
{ NCSI_PKT_RSP_DP, 4, NULL },
{ NCSI_PKT_RSP_EC, 4, NULL },
{ NCSI_PKT_RSP_DC, 4, NULL },
{ NCSI_PKT_RSP_RC, 4, NULL },
{ NCSI_PKT_RSP_ECNT, 4, NULL },
{ NCSI_PKT_RSP_DCNT, 4, NULL },
{ NCSI_PKT_RSP_AE, 4, NULL },
{ NCSI_PKT_RSP_SL, 4, NULL },
{ NCSI_PKT_RSP_GLS, 16, ncsi_rsp_handler_gls },
{ NCSI_PKT_RSP_SVF, 4, NULL },
{ NCSI_PKT_RSP_EV, 4, NULL },
{ NCSI_PKT_RSP_DV, 4, NULL },
{ NCSI_PKT_RSP_SMA, 4, NULL },
{ NCSI_PKT_RSP_EBF, 4, NULL },
{ NCSI_PKT_RSP_DBF, 4, NULL },
{ NCSI_PKT_RSP_EGMF, 4, NULL },
{ NCSI_PKT_RSP_DGMF, 4, NULL },
{ NCSI_PKT_RSP_SNFC, 4, NULL },
{ NCSI_PKT_RSP_GVI, 40, ncsi_rsp_handler_gvi },
{ NCSI_PKT_RSP_GC, 32, ncsi_rsp_handler_gc },
{ NCSI_PKT_RSP_GP, 40, ncsi_rsp_handler_gp },
{ NCSI_PKT_RSP_GCPS, 172, NULL },
{ NCSI_PKT_RSP_GNS, 172, NULL },
{ NCSI_PKT_RSP_GNPTS, 172, NULL },
{ NCSI_PKT_RSP_GPS, 8, NULL },
{ NCSI_PKT_RSP_OEM, 0, NULL },
{ NCSI_PKT_RSP_PLDM, 0, NULL },
{ NCSI_PKT_RSP_GPUUID, 20, NULL } };
/*
* packet format : ncsi header + payload + checksum
*/
#define NCSI_MAX_PAYLOAD 172
#define NCSI_MAX_LEN (sizeof(struct ncsi_pkt_hdr) + NCSI_MAX_PAYLOAD + 4)
void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
{
const struct ncsi_pkt_hdr *nh =
(const struct ncsi_pkt_hdr *)(pkt + ETH_HLEN);
uint8_t ncsi_reply[ETH_HLEN + NCSI_MAX_LEN];
struct ethhdr *reh = (struct ethhdr *)ncsi_reply;
struct ncsi_rsp_pkt_hdr *rnh =
(struct ncsi_rsp_pkt_hdr *)(ncsi_reply + ETH_HLEN);
const struct ncsi_rsp_handler *handler = NULL;
int i;
int ncsi_rsp_len = sizeof(*nh);
uint32_t checksum;
uint32_t *pchecksum;
if (pkt_len < ETH_HLEN + sizeof(struct ncsi_pkt_hdr)) {
return; /* packet too short */
}
memset(ncsi_reply, 0, sizeof(ncsi_reply));
memset(reh->h_dest, 0xff, ETH_ALEN);
memset(reh->h_source, 0xff, ETH_ALEN);
reh->h_proto = htons(ETH_P_NCSI);
for (i = 0; i < G_N_ELEMENTS(ncsi_rsp_handlers); i++) {
if (ncsi_rsp_handlers[i].type == nh->type + 0x80) {
handler = &ncsi_rsp_handlers[i];
break;
}
}
rnh->common.mc_id = nh->mc_id;
rnh->common.revision = NCSI_PKT_REVISION;
rnh->common.id = nh->id;
rnh->common.type = nh->type + 0x80;
rnh->common.channel = nh->channel;
if (handler) {
rnh->common.length = htons(handler->payload);
rnh->code = htons(NCSI_PKT_RSP_C_COMPLETED);
rnh->reason = htons(NCSI_PKT_RSP_R_NO_ERROR);
if (handler->handler) {
/* TODO: handle errors */
handler->handler(slirp, rnh);
}
ncsi_rsp_len += handler->payload;
} else {
rnh->common.length = 0;
rnh->code = htons(NCSI_PKT_RSP_C_UNAVAILABLE);
rnh->reason = htons(NCSI_PKT_RSP_R_UNKNOWN);
}
/* Add the optional checksum at the end of the frame. */
checksum = ncsi_calculate_checksum((uint8_t *)rnh, ncsi_rsp_len);
pchecksum = (uint32_t *)((void *)rnh + ncsi_rsp_len);
*pchecksum = htonl(checksum);
ncsi_rsp_len += 4;
slirp_send_packet_all(slirp, ncsi_reply, ETH_HLEN + ncsi_rsp_len);
}
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