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linux/net/ethtool/pse-pd.c
Diogo Jahchan Koike cff69f72d3 ethtool: pse-pd: move pse validation into set 
Move validation into set, removing .set_validate operation as its current
implementation holds the rtnl lock for acquiring the PHY device, defeating
the intended purpose of checking before grabbing the lock.

Reported-by: syzbot+ec369e6d58e210135f71@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=ec369e6d58e210135f71
Fixes: 31748765be ("net: ethtool: pse-pd: Target the command to the requested PHY")
Signed-off-by: Diogo Jahchan Koike <djahchankoike@gmail.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20240829184830.5861-1-djahchankoike@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-30 12:14:57 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
//
// ethtool interface for Ethernet PSE (Power Sourcing Equipment)
// and PD (Powered Device)
//
// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
//
#include "common.h"
#include "linux/pse-pd/pse.h"
#include "netlink.h"
#include <linux/ethtool_netlink.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
struct pse_req_info {
struct ethnl_req_info base;
};
struct pse_reply_data {
struct ethnl_reply_data base;
struct pse_control_status status;
};
#define PSE_REPDATA(__reply_base) \
container_of(__reply_base, struct pse_reply_data, base)
/* PSE_GET */
const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = {
[ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy),
};
static int pse_get_pse_attributes(struct phy_device *phydev,
struct netlink_ext_ack *extack,
struct pse_reply_data *data)
{
if (!phydev) {
NL_SET_ERR_MSG(extack, "No PHY found");
return -EOPNOTSUPP;
}
if (!phydev->psec) {
NL_SET_ERR_MSG(extack, "No PSE is attached");
return -EOPNOTSUPP;
}
memset(&data->status, 0, sizeof(data->status));
return pse_ethtool_get_status(phydev->psec, extack, &data->status);
}
static int pse_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
const struct genl_info *info)
{
struct pse_reply_data *data = PSE_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
struct nlattr **tb = info->attrs;
struct phy_device *phydev;
int ret;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
phydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_PSE_HEADER],
info->extack);
if (IS_ERR(phydev))
return -ENODEV;
ret = pse_get_pse_attributes(phydev, info->extack, data);
ethnl_ops_complete(dev);
return ret;
}
static int pse_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct pse_reply_data *data = PSE_REPDATA(reply_base);
const struct pse_control_status *st = &data->status;
int len = 0;
if (st->podl_admin_state > 0)
len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
if (st->podl_pw_status > 0)
len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */
if (st->c33_admin_state > 0)
len += nla_total_size(sizeof(u32)); /* _C33_PSE_ADMIN_STATE */
if (st->c33_pw_status > 0)
len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_D_STATUS */
if (st->c33_pw_class > 0)
len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_CLASS */
if (st->c33_actual_pw > 0)
len += nla_total_size(sizeof(u32)); /* _C33_PSE_ACTUAL_PW */
if (st->c33_ext_state_info.c33_pse_ext_state > 0) {
len += nla_total_size(sizeof(u32)); /* _C33_PSE_EXT_STATE */
if (st->c33_ext_state_info.__c33_pse_ext_substate > 0)
/* _C33_PSE_EXT_SUBSTATE */
len += nla_total_size(sizeof(u32));
}
if (st->c33_avail_pw_limit > 0)
/* _C33_AVAIL_PSE_PW_LIMIT */
len += nla_total_size(sizeof(u32));
if (st->c33_pw_limit_nb_ranges > 0)
/* _C33_PSE_PW_LIMIT_RANGES */
len += st->c33_pw_limit_nb_ranges *
(nla_total_size(0) +
nla_total_size(sizeof(u32)) * 2);
return len;
}
static int pse_put_pw_limit_ranges(struct sk_buff *skb,
const struct pse_control_status *st)
{
const struct ethtool_c33_pse_pw_limit_range *pw_limit_ranges;
int i;
pw_limit_ranges = st->c33_pw_limit_ranges;
for (i = 0; i < st->c33_pw_limit_nb_ranges; i++) {
struct nlattr *nest;
nest = nla_nest_start(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_RANGES);
if (!nest)
return -EMSGSIZE;
if (nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_MIN,
pw_limit_ranges->min) ||
nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_MAX,
pw_limit_ranges->max)) {
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
nla_nest_end(skb, nest);
pw_limit_ranges++;
}
return 0;
}
static int pse_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct pse_reply_data *data = PSE_REPDATA(reply_base);
const struct pse_control_status *st = &data->status;
if (st->podl_admin_state > 0 &&
nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE,
st->podl_admin_state))
return -EMSGSIZE;
if (st->podl_pw_status > 0 &&
nla_put_u32(skb, ETHTOOL_A_PODL_PSE_PW_D_STATUS,
st->podl_pw_status))
return -EMSGSIZE;
if (st->c33_admin_state > 0 &&
nla_put_u32(skb, ETHTOOL_A_C33_PSE_ADMIN_STATE,
st->c33_admin_state))
return -EMSGSIZE;
if (st->c33_pw_status > 0 &&
nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_D_STATUS,
st->c33_pw_status))
return -EMSGSIZE;
if (st->c33_pw_class > 0 &&
nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_CLASS,
st->c33_pw_class))
return -EMSGSIZE;
if (st->c33_actual_pw > 0 &&
nla_put_u32(skb, ETHTOOL_A_C33_PSE_ACTUAL_PW,
st->c33_actual_pw))
return -EMSGSIZE;
if (st->c33_ext_state_info.c33_pse_ext_state > 0) {
if (nla_put_u32(skb, ETHTOOL_A_C33_PSE_EXT_STATE,
st->c33_ext_state_info.c33_pse_ext_state))
return -EMSGSIZE;
if (st->c33_ext_state_info.__c33_pse_ext_substate > 0 &&
nla_put_u32(skb, ETHTOOL_A_C33_PSE_EXT_SUBSTATE,
st->c33_ext_state_info.__c33_pse_ext_substate))
return -EMSGSIZE;
}
if (st->c33_avail_pw_limit > 0 &&
nla_put_u32(skb, ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT,
st->c33_avail_pw_limit))
return -EMSGSIZE;
if (st->c33_pw_limit_nb_ranges > 0 &&
pse_put_pw_limit_ranges(skb, st))
return -EMSGSIZE;
return 0;
}
static void pse_cleanup_data(struct ethnl_reply_data *reply_base)
{
const struct pse_reply_data *data = PSE_REPDATA(reply_base);
kfree(data->status.c33_pw_limit_ranges);
}
/* PSE_SET */
const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
[ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy),
[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] =
NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED),
[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT] = { .type = NLA_U32 },
};
static int
ethnl_set_pse_validate(struct phy_device *phydev, struct genl_info *info)
{
struct nlattr **tb = info->attrs;
if (IS_ERR_OR_NULL(phydev)) {
NL_SET_ERR_MSG(info->extack, "No PHY is attached");
return -EOPNOTSUPP;
}
if (!phydev->psec) {
NL_SET_ERR_MSG(info->extack, "No PSE is attached");
return -EOPNOTSUPP;
}
if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] &&
!pse_has_podl(phydev->psec)) {
NL_SET_ERR_MSG_ATTR(info->extack,
tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL],
"setting PoDL PSE admin control not supported");
return -EOPNOTSUPP;
}
if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] &&
!pse_has_c33(phydev->psec)) {
NL_SET_ERR_MSG_ATTR(info->extack,
tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL],
"setting C33 PSE admin control not supported");
return -EOPNOTSUPP;
}
return 0;
}
static int
ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
{
struct nlattr **tb = info->attrs;
struct phy_device *phydev;
int ret;
phydev = ethnl_req_get_phydev(req_info, tb[ETHTOOL_A_PSE_HEADER],
info->extack);
ret = ethnl_set_pse_validate(phydev, info);
if (ret)
return ret;
if (tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]) {
unsigned int pw_limit;
pw_limit = nla_get_u32(tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]);
ret = pse_ethtool_set_pw_limit(phydev->psec, info->extack,
pw_limit);
if (ret)
return ret;
}
/* These values are already validated by the ethnl_pse_set_policy */
if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] ||
tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) {
struct pse_control_config config = {};
if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL])
config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL])
config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
/* pse_ethtool_set_config() will do nothing if the config
* is zero
*/
ret = pse_ethtool_set_config(phydev->psec, info->extack,
&config);
if (ret)
return ret;
}
/* Return errno or zero - PSE has no notification */
return ret;
}
const struct ethnl_request_ops ethnl_pse_request_ops = {
.request_cmd = ETHTOOL_MSG_PSE_GET,
.reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY,
.hdr_attr = ETHTOOL_A_PSE_HEADER,
.req_info_size = sizeof(struct pse_req_info),
.reply_data_size = sizeof(struct pse_reply_data),
.prepare_data = pse_prepare_data,
.reply_size = pse_reply_size,
.fill_reply = pse_fill_reply,
.cleanup_data = pse_cleanup_data,
.set = ethnl_set_pse,
/* PSE has no notification */
};
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