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ipmi: remove IPMI_CHECK_CMD_LEN() macro 

Most IPMI command handlers in the BMC simulator start with a call to
the macro IPMI_CHECK_CMD_LEN() which verifies that a minimal number of
arguments expected by the command are indeed available. To achieve
this task, the macro implicitly uses local variables which is
misleading in the code.

This patch adds a 'cmd_len_min' attribute to the struct IPMICmdHandler
defining the minimal number of arguments expected by the command and
moves this check in the global command handler ipmi_sim_handle_command().

To clarify the checks being done on the received command, the patch
introduces a helper ipmi_get_handler().

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cédric Le Goater 2016-03-10 15:03:54 +01:00 committed by Michael S. Tsirkin
parent 5da4fb0018
commit 4f298a4b29
1 changed files with 84 additions and 80 deletions
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164
hw/ipmi/ipmi_bmc_sim.c
View File

@ -155,10 +155,15 @@ typedef struct IPMISensor {
typedef struct IPMIBmcSim IPMIBmcSim;
#define MAX_NETFNS 64
typedef void (*IPMICmdHandler)(IPMIBmcSim *s,
uint8_t *cmd, unsigned int cmd_len,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len);
typedef struct IPMICmdHandler {
void (*cmd_handler)(IPMIBmcSim *s,
uint8_t *cmd, unsigned int cmd_len,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len);
unsigned int cmd_len_min;
} IPMICmdHandler;
typedef struct IPMINetfn {
unsigned int cmd_nums;
const IPMICmdHandler *cmd_handlers;
@ -269,13 +274,6 @@ struct IPMIBmcSim {
rsp[(*rsp_len)++] = (b); \
} while (0)
/* Verify that the received command is a certain length. */
#define IPMI_CHECK_CMD_LEN(l) \
if (cmd_len < l) { \
rsp[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID; \
return; \
}
/* Check that the reservation in the command is valid. */
#define IPMI_CHECK_RESERVATION(off, r) \
do { \
@ -566,6 +564,28 @@ static int ipmi_register_netfn(IPMIBmcSim *s, unsigned int netfn,
return 0;
}
static const IPMICmdHandler *ipmi_get_handler(IPMIBmcSim *ibs,
unsigned int netfn,
unsigned int cmd)
{
const IPMICmdHandler *hdl;
if (netfn & 1 || netfn >= MAX_NETFNS || !ibs->netfns[netfn / 2]) {
return NULL;
}
if (cmd >= ibs->netfns[netfn / 2]->cmd_nums) {
return NULL;
}
hdl = &ibs->netfns[netfn / 2]->cmd_handlers[cmd];
if (!hdl->cmd_handler) {
return NULL;
}
return hdl;
}
static void next_timeout(IPMIBmcSim *ibs)
{
int64_t next;
@ -586,11 +606,11 @@ static void ipmi_sim_handle_command(IPMIBmc *b,
IPMIBmcSim *ibs = IPMI_BMC_SIMULATOR(b);
IPMIInterface *s = ibs->parent.intf;
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
unsigned int netfn;
uint8_t rsp[MAX_IPMI_MSG_SIZE];
unsigned int rsp_len_holder = 0;
unsigned int *rsp_len = &rsp_len_holder;
unsigned int max_rsp_len = sizeof(rsp);
const IPMICmdHandler *hdl;
/* Set up the response, set the low bit of NETFN. */
/* Note that max_rsp_len must be at least 3 */
@ -619,18 +639,18 @@ static void ipmi_sim_handle_command(IPMIBmc *b,
goto out;
}
netfn = cmd[0] >> 2;
/* Odd netfns are not valid, make sure the command is registered */
if ((netfn & 1) || !ibs->netfns[netfn / 2] ||
(cmd[1] >= ibs->netfns[netfn / 2]->cmd_nums) ||
(!ibs->netfns[netfn / 2]->cmd_handlers[cmd[1]])) {
hdl = ipmi_get_handler(ibs, cmd[0] >> 2, cmd[1]);
if (!hdl) {
rsp[2] = IPMI_CC_INVALID_CMD;
goto out;
}
ibs->netfns[netfn / 2]->cmd_handlers[cmd[1]](ibs, cmd, cmd_len, rsp, rsp_len,
max_rsp_len);
if (cmd_len < hdl->cmd_len_min) {
rsp[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
goto out;
}
hdl->cmd_handler(ibs, cmd, cmd_len, rsp, rsp_len, max_rsp_len);
out:
k->handle_rsp(s, msg_id, rsp, *rsp_len);
@ -737,7 +757,6 @@ static void chassis_control(IPMIBmcSim *ibs,
IPMIInterface *s = ibs->parent.intf;
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
IPMI_CHECK_CMD_LEN(3);
switch (cmd[2] & 0xf) {
case 0: /* power down */
rsp[2] = k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 0);
@ -838,7 +857,6 @@ static void set_acpi_power_state(IPMIBmcSim *ibs,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len)
{
IPMI_CHECK_CMD_LEN(4);
ibs->acpi_power_state[0] = cmd[2];
ibs->acpi_power_state[1] = cmd[3];
}
@ -869,7 +887,6 @@ static void set_bmc_global_enables(IPMIBmcSim *ibs,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len)
{
IPMI_CHECK_CMD_LEN(3);
set_global_enables(ibs, cmd[2]);
}
@ -889,7 +906,6 @@ static void clr_msg_flags(IPMIBmcSim *ibs,
IPMIInterface *s = ibs->parent.intf;
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
IPMI_CHECK_CMD_LEN(3);
ibs->msg_flags &= ~cmd[2];
k->set_atn(s, attn_set(ibs), attn_irq_enabled(ibs));
}
@ -976,15 +992,17 @@ static void send_msg(IPMIBmcSim *ibs,
uint8_t *buf;
uint8_t netfn, rqLun, rsLun, rqSeq;
IPMI_CHECK_CMD_LEN(3);
if (cmd[2] != 0) {
/* We only handle channel 0 with no options */
rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
return;
}
IPMI_CHECK_CMD_LEN(10);
if (cmd_len < 10) {
rsp[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
return;
}
if (cmd[3] != 0x40) {
/* We only emulate a MC at address 0x40. */
rsp[2] = 0x83; /* NAK on write */
@ -1092,7 +1110,6 @@ static void set_watchdog_timer(IPMIBmcSim *ibs,
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
unsigned int val;
IPMI_CHECK_CMD_LEN(8);
val = cmd[2] & 0x7; /* Validate use */
if (val == 0 || val > 5) {
rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
@ -1217,7 +1234,6 @@ static void get_sdr(IPMIBmcSim *ibs,
uint16_t nextrec;
struct ipmi_sdr_header *sdrh;
IPMI_CHECK_CMD_LEN(8);
if (cmd[6]) {
IPMI_CHECK_RESERVATION(2, ibs->sdr.reservation);
}
@ -1271,7 +1287,6 @@ static void clear_sdr_rep(IPMIBmcSim *ibs,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len)
{
IPMI_CHECK_CMD_LEN(8);
IPMI_CHECK_RESERVATION(2, ibs->sdr.reservation);
if (cmd[4] != 'C' || cmd[5] != 'L' || cmd[6] != 'R') {
rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
@ -1330,7 +1345,6 @@ static void get_sel_entry(IPMIBmcSim *ibs,
{
unsigned int val;
IPMI_CHECK_CMD_LEN(8);
if (cmd[6]) {
IPMI_CHECK_RESERVATION(2, ibs->sel.reservation);
}
@ -1375,7 +1389,6 @@ static void add_sel_entry(IPMIBmcSim *ibs,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len)
{
IPMI_CHECK_CMD_LEN(18);
if (sel_add_event(ibs, cmd + 2)) {
rsp[2] = IPMI_CC_OUT_OF_SPACE;
return;
@ -1390,7 +1403,6 @@ static void clear_sel(IPMIBmcSim *ibs,
uint8_t *rsp, unsigned int *rsp_len,
unsigned int max_rsp_len)
{
IPMI_CHECK_CMD_LEN(8);
IPMI_CHECK_RESERVATION(2, ibs->sel.reservation);
if (cmd[4] != 'C' || cmd[5] != 'L' || cmd[6] != 'R') {
rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
@ -1434,7 +1446,6 @@ static void set_sel_time(IPMIBmcSim *ibs,
uint32_t val;
struct ipmi_time now;
IPMI_CHECK_CMD_LEN(6);
val = cmd[2] | (cmd[3] << 8) | (cmd[4] << 16) | (cmd[5] << 24);
ipmi_gettime(&now);
ibs->sel.time_offset = now.tv_sec - ((long) val);
@ -1447,7 +1458,6 @@ static void set_sensor_evt_enable(IPMIBmcSim *ibs,
{
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(4);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1499,7 +1509,6 @@ static void get_sensor_evt_enable(IPMIBmcSim *ibs,
{
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(3);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1520,7 +1529,6 @@ static void rearm_sensor_evts(IPMIBmcSim *ibs,
{
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(4);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1542,7 +1550,6 @@ static void get_sensor_evt_status(IPMIBmcSim *ibs,
{
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(3);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1564,7 +1571,6 @@ static void get_sensor_reading(IPMIBmcSim *ibs,
{
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(3);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1587,7 +1593,6 @@ static void set_sensor_type(IPMIBmcSim *ibs,
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(5);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1606,7 +1611,6 @@ static void get_sensor_type(IPMIBmcSim *ibs,
IPMISensor *sens;
IPMI_CHECK_CMD_LEN(3);
if ((cmd[2] >= MAX_SENSORS) ||
!IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
@ -1619,10 +1623,10 @@ static void get_sensor_type(IPMIBmcSim *ibs,
static const IPMICmdHandler chassis_cmds[] = {
[IPMI_CMD_GET_CHASSIS_CAPABILITIES] = chassis_capabilities,
[IPMI_CMD_GET_CHASSIS_STATUS] = chassis_status,
[IPMI_CMD_CHASSIS_CONTROL] = chassis_control,
[IPMI_CMD_GET_SYS_RESTART_CAUSE] = chassis_get_sys_restart_cause
[IPMI_CMD_GET_CHASSIS_CAPABILITIES] = { chassis_capabilities },
[IPMI_CMD_GET_CHASSIS_STATUS] = { chassis_status },
[IPMI_CMD_CHASSIS_CONTROL] = { chassis_control, 3 },
[IPMI_CMD_GET_SYS_RESTART_CAUSE] = { chassis_get_sys_restart_cause }
};
static const IPMINetfn chassis_netfn = {
.cmd_nums = ARRAY_SIZE(chassis_cmds),
@ -1630,13 +1634,13 @@ static const IPMINetfn chassis_netfn = {
};
static const IPMICmdHandler sensor_event_cmds[] = {
[IPMI_CMD_SET_SENSOR_EVT_ENABLE] = set_sensor_evt_enable,
[IPMI_CMD_GET_SENSOR_EVT_ENABLE] = get_sensor_evt_enable,
[IPMI_CMD_REARM_SENSOR_EVTS] = rearm_sensor_evts,
[IPMI_CMD_GET_SENSOR_EVT_STATUS] = get_sensor_evt_status,
[IPMI_CMD_GET_SENSOR_READING] = get_sensor_reading,
[IPMI_CMD_SET_SENSOR_TYPE] = set_sensor_type,
[IPMI_CMD_GET_SENSOR_TYPE] = get_sensor_type,
[IPMI_CMD_SET_SENSOR_EVT_ENABLE] = { set_sensor_evt_enable, 4 },
[IPMI_CMD_GET_SENSOR_EVT_ENABLE] = { get_sensor_evt_enable, 3 },
[IPMI_CMD_REARM_SENSOR_EVTS] = { rearm_sensor_evts, 4 },
[IPMI_CMD_GET_SENSOR_EVT_STATUS] = { get_sensor_evt_status, 3 },
[IPMI_CMD_GET_SENSOR_READING] = { get_sensor_reading, 3 },
[IPMI_CMD_SET_SENSOR_TYPE] = { set_sensor_type, 5 },
[IPMI_CMD_GET_SENSOR_TYPE] = { get_sensor_type, 3 },
};
static const IPMINetfn sensor_event_netfn = {
.cmd_nums = ARRAY_SIZE(sensor_event_cmds),
@ -1644,22 +1648,22 @@ static const IPMINetfn sensor_event_netfn = {
};
static const IPMICmdHandler app_cmds[] = {
[IPMI_CMD_GET_DEVICE_ID] = get_device_id,
[IPMI_CMD_COLD_RESET] = cold_reset,
[IPMI_CMD_WARM_RESET] = warm_reset,
[IPMI_CMD_SET_ACPI_POWER_STATE] = set_acpi_power_state,
[IPMI_CMD_GET_ACPI_POWER_STATE] = get_acpi_power_state,
[IPMI_CMD_GET_DEVICE_GUID] = get_device_guid,
[IPMI_CMD_SET_BMC_GLOBAL_ENABLES] = set_bmc_global_enables,
[IPMI_CMD_GET_BMC_GLOBAL_ENABLES] = get_bmc_global_enables,
[IPMI_CMD_CLR_MSG_FLAGS] = clr_msg_flags,
[IPMI_CMD_GET_MSG_FLAGS] = get_msg_flags,
[IPMI_CMD_GET_MSG] = get_msg,
[IPMI_CMD_SEND_MSG] = send_msg,
[IPMI_CMD_READ_EVT_MSG_BUF] = read_evt_msg_buf,
[IPMI_CMD_RESET_WATCHDOG_TIMER] = reset_watchdog_timer,
[IPMI_CMD_SET_WATCHDOG_TIMER] = set_watchdog_timer,
[IPMI_CMD_GET_WATCHDOG_TIMER] = get_watchdog_timer,
[IPMI_CMD_GET_DEVICE_ID] = { get_device_id },
[IPMI_CMD_COLD_RESET] = { cold_reset },
[IPMI_CMD_WARM_RESET] = { warm_reset },
[IPMI_CMD_SET_ACPI_POWER_STATE] = { set_acpi_power_state, 4 },
[IPMI_CMD_GET_ACPI_POWER_STATE] = { get_acpi_power_state },
[IPMI_CMD_GET_DEVICE_GUID] = { get_device_guid },
[IPMI_CMD_SET_BMC_GLOBAL_ENABLES] = { set_bmc_global_enables, 3 },
[IPMI_CMD_GET_BMC_GLOBAL_ENABLES] = { get_bmc_global_enables },
[IPMI_CMD_CLR_MSG_FLAGS] = { clr_msg_flags, 3 },
[IPMI_CMD_GET_MSG_FLAGS] = { get_msg_flags },
[IPMI_CMD_GET_MSG] = { get_msg },
[IPMI_CMD_SEND_MSG] = { send_msg, 3 },
[IPMI_CMD_READ_EVT_MSG_BUF] = { read_evt_msg_buf },
[IPMI_CMD_RESET_WATCHDOG_TIMER] = { reset_watchdog_timer },
[IPMI_CMD_SET_WATCHDOG_TIMER] = { set_watchdog_timer, 8 },
[IPMI_CMD_GET_WATCHDOG_TIMER] = { get_watchdog_timer },
};
static const IPMINetfn app_netfn = {
.cmd_nums = ARRAY_SIZE(app_cmds),
@ -1667,18 +1671,18 @@ static const IPMINetfn app_netfn = {
};
static const IPMICmdHandler storage_cmds[] = {
[IPMI_CMD_GET_SDR_REP_INFO] = get_sdr_rep_info,
[IPMI_CMD_RESERVE_SDR_REP] = reserve_sdr_rep,
[IPMI_CMD_GET_SDR] = get_sdr,
[IPMI_CMD_ADD_SDR] = add_sdr,
[IPMI_CMD_CLEAR_SDR_REP] = clear_sdr_rep,
[IPMI_CMD_GET_SEL_INFO] = get_sel_info,
[IPMI_CMD_RESERVE_SEL] = reserve_sel,
[IPMI_CMD_GET_SEL_ENTRY] = get_sel_entry,
[IPMI_CMD_ADD_SEL_ENTRY] = add_sel_entry,
[IPMI_CMD_CLEAR_SEL] = clear_sel,
[IPMI_CMD_GET_SEL_TIME] = get_sel_time,
[IPMI_CMD_SET_SEL_TIME] = set_sel_time,
[IPMI_CMD_GET_SDR_REP_INFO] = { get_sdr_rep_info },
[IPMI_CMD_RESERVE_SDR_REP] = { reserve_sdr_rep },
[IPMI_CMD_GET_SDR] = { get_sdr, 8 },
[IPMI_CMD_ADD_SDR] = { add_sdr },
[IPMI_CMD_CLEAR_SDR_REP] = { clear_sdr_rep, 8 },
[IPMI_CMD_GET_SEL_INFO] = { get_sel_info },
[IPMI_CMD_RESERVE_SEL] = { reserve_sel },
[IPMI_CMD_GET_SEL_ENTRY] = { get_sel_entry, 8 },
[IPMI_CMD_ADD_SEL_ENTRY] = { add_sel_entry, 18 },
[IPMI_CMD_CLEAR_SEL] = { clear_sel, 8 },
[IPMI_CMD_GET_SEL_TIME] = { get_sel_time, 6 },
[IPMI_CMD_SET_SEL_TIME] = { set_sel_time },
};
static const IPMINetfn storage_netfn = {