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// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
#include "bitset.h"
struct privflags_req_info {
struct ethnl_req_info base;
};
struct privflags_reply_data {
struct ethnl_reply_data base;
const char (*priv_flag_names)[ETH_GSTRING_LEN];
unsigned int n_priv_flags;
u32 priv_flags;
};
#define PRIVFLAGS_REPDATA(__reply_base) \
container_of(__reply_base, struct privflags_reply_data, base)
static const struct nla_policy
privflags_get_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {
[ETHTOOL_A_PRIVFLAGS_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_PRIVFLAGS_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_PRIVFLAGS_FLAGS] = { .type = NLA_REJECT },
};
static int ethnl_get_priv_flags_info(struct net_device *dev,
unsigned int *count,
const char (**names)[ETH_GSTRING_LEN])
{
const struct ethtool_ops *ops = dev->ethtool_ops;
int nflags;
nflags = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
if (nflags < 0)
return nflags;
if (names) {
*names = kcalloc(nflags, ETH_GSTRING_LEN, GFP_KERNEL);
if (!*names)
return -ENOMEM;
ops->get_strings(dev, ETH_SS_PRIV_FLAGS, (u8 *)*names);
}
/* We can pass more than 32 private flags to userspace via netlink but
* we cannot get more with ethtool_ops::get_priv_flags(). Note that we
* must not adjust nflags before allocating the space for flag names
* as the buffer must be large enough for all flags.
*/
if (WARN_ONCE(nflags > 32,
"device %s reports more than 32 private flags (%d)\n",
netdev_name(dev), nflags))
nflags = 32;
*count = nflags;
return 0;
}
static int privflags_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
{
struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
const char (*names)[ETH_GSTRING_LEN];
const struct ethtool_ops *ops;
unsigned int nflags;
int ret;
ops = dev->ethtool_ops;
if (!ops->get_priv_flags || !ops->get_sset_count || !ops->get_strings)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
ret = ethnl_get_priv_flags_info(dev, &nflags, &names);
if (ret < 0)
goto out_ops;
data->priv_flags = ops->get_priv_flags(dev);
data->priv_flag_names = names;
data->n_priv_flags = nflags;
out_ops:
ethnl_ops_complete(dev);
return ret;
}
static int privflags_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base);
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags);
return ethnl_bitset32_size(&data->priv_flags, &all_flags,
data->n_priv_flags,
data->priv_flag_names, compact);
}
static int privflags_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base);
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags);
return ethnl_put_bitset32(skb, ETHTOOL_A_PRIVFLAGS_FLAGS,
&data->priv_flags, &all_flags,
data->n_priv_flags, data->priv_flag_names,
compact);
}
static void privflags_cleanup_data(struct ethnl_reply_data *reply_data)
{
struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_data);
kfree(data->priv_flag_names);
}
const struct ethnl_request_ops ethnl_privflags_request_ops = {
.request_cmd = ETHTOOL_MSG_PRIVFLAGS_GET,
.reply_cmd = ETHTOOL_MSG_PRIVFLAGS_GET_REPLY,
.hdr_attr = ETHTOOL_A_PRIVFLAGS_HEADER,
.max_attr = ETHTOOL_A_PRIVFLAGS_MAX,
.req_info_size = sizeof(struct privflags_req_info),
.reply_data_size = sizeof(struct privflags_reply_data),
.request_policy = privflags_get_policy,
.prepare_data = privflags_prepare_data,
.reply_size = privflags_reply_size,
.fill_reply = privflags_fill_reply,
.cleanup_data = privflags_cleanup_data,
};
/* PRIVFLAGS_SET */
static const struct nla_policy
privflags_set_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {
[ETHTOOL_A_PRIVFLAGS_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_PRIVFLAGS_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_PRIVFLAGS_FLAGS] = { .type = NLA_NESTED },
};
int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *tb[ETHTOOL_A_PRIVFLAGS_MAX + 1];
const char (*names)[ETH_GSTRING_LEN] = NULL;
struct ethnl_req_info req_info = {};
const struct ethtool_ops *ops;
struct net_device *dev;
unsigned int nflags;
bool mod = false;
bool compact;
u32 flags;
int ret;
ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
ETHTOOL_A_PRIVFLAGS_MAX, privflags_set_policy,
info->extack);
if (ret < 0)
return ret;
if (!tb[ETHTOOL_A_PRIVFLAGS_FLAGS])
return -EINVAL;
ret = ethnl_bitset_is_compact(tb[ETHTOOL_A_PRIVFLAGS_FLAGS], &compact);
if (ret < 0)
return ret;
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_PRIVFLAGS_HEADER],
genl_info_net(info), info->extack,
true);
if (ret < 0)
return ret;
dev = req_info.dev;
ops = dev->ethtool_ops;
ret = -EOPNOTSUPP;
if (!ops->get_priv_flags || !ops->set_priv_flags ||
!ops->get_sset_count || !ops->get_strings)
goto out_dev;
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
ret = ethnl_get_priv_flags_info(dev, &nflags, compact ? NULL : &names);
if (ret < 0)
goto out_ops;
flags = ops->get_priv_flags(dev);
ret = ethnl_update_bitset32(&flags, nflags,
tb[ETHTOOL_A_PRIVFLAGS_FLAGS], names,
info->extack, &mod);
if (ret < 0 || !mod)
goto out_free;
ret = ops->set_priv_flags(dev, flags);
if (ret < 0)
goto out_free;
ethtool_notify(dev, ETHTOOL_MSG_PRIVFLAGS_NTF, NULL);
out_free:
kfree(names);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
out_dev:
dev_put(dev);
return ret;
}
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