linux/linux-5.4.31/drivers/infiniband/core/security.c

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2024-01-30 10:43:28 +00:00
/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/security.h>
#include <linux/completion.h>
#include <linux/list.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
#include "core_priv.h"
#include "mad_priv.h"
static LIST_HEAD(mad_agent_list);
/* Lock to protect mad_agent_list */
static DEFINE_SPINLOCK(mad_agent_list_lock);
static struct pkey_index_qp_list *get_pkey_idx_qp_list(struct ib_port_pkey *pp)
{
struct pkey_index_qp_list *pkey = NULL;
struct pkey_index_qp_list *tmp_pkey;
struct ib_device *dev = pp->sec->dev;
spin_lock(&dev->port_data[pp->port_num].pkey_list_lock);
list_for_each_entry (tmp_pkey, &dev->port_data[pp->port_num].pkey_list,
pkey_index_list) {
if (tmp_pkey->pkey_index == pp->pkey_index) {
pkey = tmp_pkey;
break;
}
}
spin_unlock(&dev->port_data[pp->port_num].pkey_list_lock);
return pkey;
}
static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
u16 *pkey,
u64 *subnet_prefix)
{
struct ib_device *dev = pp->sec->dev;
int ret;
ret = ib_get_cached_pkey(dev, pp->port_num, pp->pkey_index, pkey);
if (ret)
return ret;
ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
return ret;
}
static int enforce_qp_pkey_security(u16 pkey,
u64 subnet_prefix,
struct ib_qp_security *qp_sec)
{
struct ib_qp_security *shared_qp_sec;
int ret;
ret = security_ib_pkey_access(qp_sec->security, subnet_prefix, pkey);
if (ret)
return ret;
list_for_each_entry(shared_qp_sec,
&qp_sec->shared_qp_list,
shared_qp_list) {
ret = security_ib_pkey_access(shared_qp_sec->security,
subnet_prefix,
pkey);
if (ret)
return ret;
}
return 0;
}
/* The caller of this function must hold the QP security
* mutex of the QP of the security structure in *pps.
*
* It takes separate ports_pkeys and security structure
* because in some cases the pps will be for a new settings
* or the pps will be for the real QP and security structure
* will be for a shared QP.
*/
static int check_qp_port_pkey_settings(struct ib_ports_pkeys *pps,
struct ib_qp_security *sec)
{
u64 subnet_prefix;
u16 pkey;
int ret = 0;
if (!pps)
return 0;
if (pps->main.state != IB_PORT_PKEY_NOT_VALID) {
ret = get_pkey_and_subnet_prefix(&pps->main,
&pkey,
&subnet_prefix);
if (ret)
return ret;
ret = enforce_qp_pkey_security(pkey,
subnet_prefix,
sec);
if (ret)
return ret;
}
if (pps->alt.state != IB_PORT_PKEY_NOT_VALID) {
ret = get_pkey_and_subnet_prefix(&pps->alt,
&pkey,
&subnet_prefix);
if (ret)
return ret;
ret = enforce_qp_pkey_security(pkey,
subnet_prefix,
sec);
}
return ret;
}
/* The caller of this function must hold the QP security
* mutex.
*/
static void qp_to_error(struct ib_qp_security *sec)
{
struct ib_qp_security *shared_qp_sec;
struct ib_qp_attr attr = {
.qp_state = IB_QPS_ERR
};
struct ib_event event = {
.event = IB_EVENT_QP_FATAL
};
/* If the QP is in the process of being destroyed
* the qp pointer in the security structure is
* undefined. It cannot be modified now.
*/
if (sec->destroying)
return;
ib_modify_qp(sec->qp,
&attr,
IB_QP_STATE);
if (sec->qp->event_handler && sec->qp->qp_context) {
event.element.qp = sec->qp;
sec->qp->event_handler(&event,
sec->qp->qp_context);
}
list_for_each_entry(shared_qp_sec,
&sec->shared_qp_list,
shared_qp_list) {
struct ib_qp *qp = shared_qp_sec->qp;
if (qp->event_handler && qp->qp_context) {
event.element.qp = qp;
event.device = qp->device;
qp->event_handler(&event,
qp->qp_context);
}
}
}
static inline void check_pkey_qps(struct pkey_index_qp_list *pkey,
struct ib_device *device,
u8 port_num,
u64 subnet_prefix)
{
struct ib_port_pkey *pp, *tmp_pp;
bool comp;
LIST_HEAD(to_error_list);
u16 pkey_val;
if (!ib_get_cached_pkey(device,
port_num,
pkey->pkey_index,
&pkey_val)) {
spin_lock(&pkey->qp_list_lock);
list_for_each_entry(pp, &pkey->qp_list, qp_list) {
if (atomic_read(&pp->sec->error_list_count))
continue;
if (enforce_qp_pkey_security(pkey_val,
subnet_prefix,
pp->sec)) {
atomic_inc(&pp->sec->error_list_count);
list_add(&pp->to_error_list,
&to_error_list);
}
}
spin_unlock(&pkey->qp_list_lock);
}
list_for_each_entry_safe(pp,
tmp_pp,
&to_error_list,
to_error_list) {
mutex_lock(&pp->sec->mutex);
qp_to_error(pp->sec);
list_del(&pp->to_error_list);
atomic_dec(&pp->sec->error_list_count);
comp = pp->sec->destroying;
mutex_unlock(&pp->sec->mutex);
if (comp)
complete(&pp->sec->error_complete);
}
}
/* The caller of this function must hold the QP security
* mutex.
*/
static int port_pkey_list_insert(struct ib_port_pkey *pp)
{
struct pkey_index_qp_list *tmp_pkey;
struct pkey_index_qp_list *pkey;
struct ib_device *dev;
u8 port_num = pp->port_num;
int ret = 0;
if (pp->state != IB_PORT_PKEY_VALID)
return 0;
dev = pp->sec->dev;
pkey = get_pkey_idx_qp_list(pp);
if (!pkey) {
bool found = false;
pkey = kzalloc(sizeof(*pkey), GFP_KERNEL);
if (!pkey)
return -ENOMEM;
spin_lock(&dev->port_data[port_num].pkey_list_lock);
/* Check for the PKey again. A racing process may
* have created it.
*/
list_for_each_entry(tmp_pkey,
&dev->port_data[port_num].pkey_list,
pkey_index_list) {
if (tmp_pkey->pkey_index == pp->pkey_index) {
kfree(pkey);
pkey = tmp_pkey;
found = true;
break;
}
}
if (!found) {
pkey->pkey_index = pp->pkey_index;
spin_lock_init(&pkey->qp_list_lock);
INIT_LIST_HEAD(&pkey->qp_list);
list_add(&pkey->pkey_index_list,
&dev->port_data[port_num].pkey_list);
}
spin_unlock(&dev->port_data[port_num].pkey_list_lock);
}
spin_lock(&pkey->qp_list_lock);
list_add(&pp->qp_list, &pkey->qp_list);
spin_unlock(&pkey->qp_list_lock);
pp->state = IB_PORT_PKEY_LISTED;
return ret;
}
/* The caller of this function must hold the QP security
* mutex.
*/
static void port_pkey_list_remove(struct ib_port_pkey *pp)
{
struct pkey_index_qp_list *pkey;
if (pp->state != IB_PORT_PKEY_LISTED)
return;
pkey = get_pkey_idx_qp_list(pp);
spin_lock(&pkey->qp_list_lock);
list_del(&pp->qp_list);
spin_unlock(&pkey->qp_list_lock);
/* The setting may still be valid, i.e. after
* a destroy has failed for example.
*/
pp->state = IB_PORT_PKEY_VALID;
}
static void destroy_qp_security(struct ib_qp_security *sec)
{
security_ib_free_security(sec->security);
kfree(sec->ports_pkeys);
kfree(sec);
}
/* The caller of this function must hold the QP security
* mutex.
*/
static struct ib_ports_pkeys *get_new_pps(const struct ib_qp *qp,
const struct ib_qp_attr *qp_attr,
int qp_attr_mask)
{
struct ib_ports_pkeys *new_pps;
struct ib_ports_pkeys *qp_pps = qp->qp_sec->ports_pkeys;
new_pps = kzalloc(sizeof(*new_pps), GFP_KERNEL);
if (!new_pps)
return NULL;
if (qp_attr_mask & IB_QP_PORT)
new_pps->main.port_num = qp_attr->port_num;
else if (qp_pps)
new_pps->main.port_num = qp_pps->main.port_num;
if (qp_attr_mask & IB_QP_PKEY_INDEX)
new_pps->main.pkey_index = qp_attr->pkey_index;
else if (qp_pps)
new_pps->main.pkey_index = qp_pps->main.pkey_index;
if (((qp_attr_mask & IB_QP_PKEY_INDEX) &&
(qp_attr_mask & IB_QP_PORT)) ||
(qp_pps && qp_pps->main.state != IB_PORT_PKEY_NOT_VALID))
new_pps->main.state = IB_PORT_PKEY_VALID;
if (qp_attr_mask & IB_QP_ALT_PATH) {
new_pps->alt.port_num = qp_attr->alt_port_num;
new_pps->alt.pkey_index = qp_attr->alt_pkey_index;
new_pps->alt.state = IB_PORT_PKEY_VALID;
} else if (qp_pps) {
new_pps->alt.port_num = qp_pps->alt.port_num;
new_pps->alt.pkey_index = qp_pps->alt.pkey_index;
if (qp_pps->alt.state != IB_PORT_PKEY_NOT_VALID)
new_pps->alt.state = IB_PORT_PKEY_VALID;
}
new_pps->main.sec = qp->qp_sec;
new_pps->alt.sec = qp->qp_sec;
return new_pps;
}
int ib_open_shared_qp_security(struct ib_qp *qp, struct ib_device *dev)
{
struct ib_qp *real_qp = qp->real_qp;
int ret;
ret = ib_create_qp_security(qp, dev);
if (ret)
return ret;
if (!qp->qp_sec)
return 0;
mutex_lock(&real_qp->qp_sec->mutex);
ret = check_qp_port_pkey_settings(real_qp->qp_sec->ports_pkeys,
qp->qp_sec);
if (ret)
goto ret;
if (qp != real_qp)
list_add(&qp->qp_sec->shared_qp_list,
&real_qp->qp_sec->shared_qp_list);
ret:
mutex_unlock(&real_qp->qp_sec->mutex);
if (ret)
destroy_qp_security(qp->qp_sec);
return ret;
}
void ib_close_shared_qp_security(struct ib_qp_security *sec)
{
struct ib_qp *real_qp = sec->qp->real_qp;
mutex_lock(&real_qp->qp_sec->mutex);
list_del(&sec->shared_qp_list);
mutex_unlock(&real_qp->qp_sec->mutex);
destroy_qp_security(sec);
}
int ib_create_qp_security(struct ib_qp *qp, struct ib_device *dev)
{
unsigned int i;
bool is_ib = false;
int ret;
rdma_for_each_port (dev, i) {
is_ib = rdma_protocol_ib(dev, i);
if (is_ib)
break;
}
/* If this isn't an IB device don't create the security context */
if (!is_ib)
return 0;
qp->qp_sec = kzalloc(sizeof(*qp->qp_sec), GFP_KERNEL);
if (!qp->qp_sec)
return -ENOMEM;
qp->qp_sec->qp = qp;
qp->qp_sec->dev = dev;
mutex_init(&qp->qp_sec->mutex);
INIT_LIST_HEAD(&qp->qp_sec->shared_qp_list);
atomic_set(&qp->qp_sec->error_list_count, 0);
init_completion(&qp->qp_sec->error_complete);
ret = security_ib_alloc_security(&qp->qp_sec->security);
if (ret) {
kfree(qp->qp_sec);
qp->qp_sec = NULL;
}
return ret;
}
EXPORT_SYMBOL(ib_create_qp_security);
void ib_destroy_qp_security_begin(struct ib_qp_security *sec)
{
/* Return if not IB */
if (!sec)
return;
mutex_lock(&sec->mutex);
/* Remove the QP from the lists so it won't get added to
* a to_error_list during the destroy process.
*/
if (sec->ports_pkeys) {
port_pkey_list_remove(&sec->ports_pkeys->main);
port_pkey_list_remove(&sec->ports_pkeys->alt);
}
/* If the QP is already in one or more of those lists
* the destroying flag will ensure the to error flow
* doesn't operate on an undefined QP.
*/
sec->destroying = true;
/* Record the error list count to know how many completions
* to wait for.
*/
sec->error_comps_pending = atomic_read(&sec->error_list_count);
mutex_unlock(&sec->mutex);
}
void ib_destroy_qp_security_abort(struct ib_qp_security *sec)
{
int ret;
int i;
/* Return if not IB */
if (!sec)
return;
/* If a concurrent cache update is in progress this
* QP security could be marked for an error state
* transition. Wait for this to complete.
*/
for (i = 0; i < sec->error_comps_pending; i++)
wait_for_completion(&sec->error_complete);
mutex_lock(&sec->mutex);
sec->destroying = false;
/* Restore the position in the lists and verify
* access is still allowed in case a cache update
* occurred while attempting to destroy.
*
* Because these setting were listed already
* and removed during ib_destroy_qp_security_begin
* we know the pkey_index_qp_list for the PKey
* already exists so port_pkey_list_insert won't fail.
*/
if (sec->ports_pkeys) {
port_pkey_list_insert(&sec->ports_pkeys->main);
port_pkey_list_insert(&sec->ports_pkeys->alt);
}
ret = check_qp_port_pkey_settings(sec->ports_pkeys, sec);
if (ret)
qp_to_error(sec);
mutex_unlock(&sec->mutex);
}
void ib_destroy_qp_security_end(struct ib_qp_security *sec)
{
int i;
/* Return if not IB */
if (!sec)
return;
/* If a concurrent cache update is occurring we must
* wait until this QP security structure is processed
* in the QP to error flow before destroying it because
* the to_error_list is in use.
*/
for (i = 0; i < sec->error_comps_pending; i++)
wait_for_completion(&sec->error_complete);
destroy_qp_security(sec);
}
void ib_security_cache_change(struct ib_device *device,
u8 port_num,
u64 subnet_prefix)
{
struct pkey_index_qp_list *pkey;
list_for_each_entry (pkey, &device->port_data[port_num].pkey_list,
pkey_index_list) {
check_pkey_qps(pkey,
device,
port_num,
subnet_prefix);
}
}
void ib_security_release_port_pkey_list(struct ib_device *device)
{
struct pkey_index_qp_list *pkey, *tmp_pkey;
unsigned int i;
rdma_for_each_port (device, i) {
list_for_each_entry_safe(pkey,
tmp_pkey,
&device->port_data[i].pkey_list,
pkey_index_list) {
list_del(&pkey->pkey_index_list);
kfree(pkey);
}
}
}
int ib_security_modify_qp(struct ib_qp *qp,
struct ib_qp_attr *qp_attr,
int qp_attr_mask,
struct ib_udata *udata)
{
int ret = 0;
struct ib_ports_pkeys *tmp_pps;
struct ib_ports_pkeys *new_pps = NULL;
struct ib_qp *real_qp = qp->real_qp;
bool special_qp = (real_qp->qp_type == IB_QPT_SMI ||
real_qp->qp_type == IB_QPT_GSI ||
real_qp->qp_type >= IB_QPT_RESERVED1);
bool pps_change = ((qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) ||
(qp_attr_mask & IB_QP_ALT_PATH));
WARN_ONCE((qp_attr_mask & IB_QP_PORT &&
rdma_protocol_ib(real_qp->device, qp_attr->port_num) &&
!real_qp->qp_sec),
"%s: QP security is not initialized for IB QP: %d\n",
__func__, real_qp->qp_num);
/* The port/pkey settings are maintained only for the real QP. Open
* handles on the real QP will be in the shared_qp_list. When
* enforcing security on the real QP all the shared QPs will be
* checked as well.
*/
if (pps_change && !special_qp && real_qp->qp_sec) {
mutex_lock(&real_qp->qp_sec->mutex);
new_pps = get_new_pps(real_qp,
qp_attr,
qp_attr_mask);
if (!new_pps) {
mutex_unlock(&real_qp->qp_sec->mutex);
return -ENOMEM;
}
/* Add this QP to the lists for the new port
* and pkey settings before checking for permission
* in case there is a concurrent cache update
* occurring. Walking the list for a cache change
* doesn't acquire the security mutex unless it's
* sending the QP to error.
*/
ret = port_pkey_list_insert(&new_pps->main);
if (!ret)
ret = port_pkey_list_insert(&new_pps->alt);
if (!ret)
ret = check_qp_port_pkey_settings(new_pps,
real_qp->qp_sec);
}
if (!ret)
ret = real_qp->device->ops.modify_qp(real_qp,
qp_attr,
qp_attr_mask,
udata);
if (new_pps) {
/* Clean up the lists and free the appropriate
* ports_pkeys structure.
*/
if (ret) {
tmp_pps = new_pps;
} else {
tmp_pps = real_qp->qp_sec->ports_pkeys;
real_qp->qp_sec->ports_pkeys = new_pps;
}
if (tmp_pps) {
port_pkey_list_remove(&tmp_pps->main);
port_pkey_list_remove(&tmp_pps->alt);
}
kfree(tmp_pps);
mutex_unlock(&real_qp->qp_sec->mutex);
}
return ret;
}
static int ib_security_pkey_access(struct ib_device *dev,
u8 port_num,
u16 pkey_index,
void *sec)
{
u64 subnet_prefix;
u16 pkey;
int ret;
if (!rdma_protocol_ib(dev, port_num))
return 0;
ret = ib_get_cached_pkey(dev, port_num, pkey_index, &pkey);
if (ret)
return ret;
ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
if (ret)
return ret;
return security_ib_pkey_access(sec, subnet_prefix, pkey);
}
void ib_mad_agent_security_change(void)
{
struct ib_mad_agent *ag;
spin_lock(&mad_agent_list_lock);
list_for_each_entry(ag,
&mad_agent_list,
mad_agent_sec_list)
WRITE_ONCE(ag->smp_allowed,
!security_ib_endport_manage_subnet(ag->security,
dev_name(&ag->device->dev), ag->port_num));
spin_unlock(&mad_agent_list_lock);
}
int ib_mad_agent_security_setup(struct ib_mad_agent *agent,
enum ib_qp_type qp_type)
{
int ret;
if (!rdma_protocol_ib(agent->device, agent->port_num))
return 0;
INIT_LIST_HEAD(&agent->mad_agent_sec_list);
ret = security_ib_alloc_security(&agent->security);
if (ret)
return ret;
if (qp_type != IB_QPT_SMI)
return 0;
spin_lock(&mad_agent_list_lock);
ret = security_ib_endport_manage_subnet(agent->security,
dev_name(&agent->device->dev),
agent->port_num);
if (ret)
goto free_security;
WRITE_ONCE(agent->smp_allowed, true);
list_add(&agent->mad_agent_sec_list, &mad_agent_list);
spin_unlock(&mad_agent_list_lock);
return 0;
free_security:
spin_unlock(&mad_agent_list_lock);
security_ib_free_security(agent->security);
return ret;
}
void ib_mad_agent_security_cleanup(struct ib_mad_agent *agent)
{
if (!rdma_protocol_ib(agent->device, agent->port_num))
return;
if (agent->qp->qp_type == IB_QPT_SMI) {
spin_lock(&mad_agent_list_lock);
list_del(&agent->mad_agent_sec_list);
spin_unlock(&mad_agent_list_lock);
}
security_ib_free_security(agent->security);
}
int ib_mad_enforce_security(struct ib_mad_agent_private *map, u16 pkey_index)
{
if (!rdma_protocol_ib(map->agent.device, map->agent.port_num))
return 0;
if (map->agent.qp->qp_type == IB_QPT_SMI) {
if (!READ_ONCE(map->agent.smp_allowed))
return -EACCES;
return 0;
}
return ib_security_pkey_access(map->agent.device,
map->agent.port_num,
pkey_index,
map->agent.security);
}