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// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
#include "bitset.h"
struct features_req_info {
struct ethnl_req_info base;
};
struct features_reply_data {
struct ethnl_reply_data base;
u32 hw[ETHTOOL_DEV_FEATURE_WORDS];
u32 wanted[ETHTOOL_DEV_FEATURE_WORDS];
u32 active[ETHTOOL_DEV_FEATURE_WORDS];
u32 nochange[ETHTOOL_DEV_FEATURE_WORDS];
u32 all[ETHTOOL_DEV_FEATURE_WORDS];
};
#define FEATURES_REPDATA(__reply_base) \
container_of(__reply_base, struct features_reply_data, base)
const struct nla_policy ethnl_features_get_policy[] = {
[ETHTOOL_A_FEATURES_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
};
static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
{
unsigned int i;
for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
dest[i] = src >> (32 * i);
}
static int features_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
{
struct features_reply_data *data = FEATURES_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
netdev_features_t all_features;
ethnl_features_to_bitmap32(data->hw, dev->hw_features);
ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
ethnl_features_to_bitmap32(data->active, dev->features);
ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
ethnl_features_to_bitmap32(data->all, all_features);
return 0;
}
static int features_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
unsigned int len = 0;
int ret;
ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
len += ret;
ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
len += ret;
ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
len += ret;
ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
len += ret;
return len;
}
static int features_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
int ret;
ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
data->all, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
NULL, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
NULL, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
return ret;
return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
data->nochange, NULL, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
}
const struct ethnl_request_ops ethnl_features_request_ops = {
.request_cmd = ETHTOOL_MSG_FEATURES_GET,
.reply_cmd = ETHTOOL_MSG_FEATURES_GET_REPLY,
.hdr_attr = ETHTOOL_A_FEATURES_HEADER,
.req_info_size = sizeof(struct features_req_info),
.reply_data_size = sizeof(struct features_reply_data),
.prepare_data = features_prepare_data,
.reply_size = features_reply_size,
.fill_reply = features_fill_reply,
};
/* FEATURES_SET */
const struct nla_policy ethnl_features_set_policy[] = {
[ETHTOOL_A_FEATURES_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_NESTED },
};
static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
{
const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
unsigned int i;
bitmap_zero(dest, NETDEV_FEATURE_COUNT);
for (i = 0; i < words; i++)
dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
}
static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
{
const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
netdev_features_t ret = 0;
unsigned int i;
for (i = 0; i < words; i++)
ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
return ret;
}
static int features_send_reply(struct net_device *dev, struct genl_info *info,
const unsigned long *wanted,
const unsigned long *wanted_mask,
const unsigned long *active,
const unsigned long *active_mask, bool compact)
{
struct sk_buff *rskb;
void *reply_payload;
int reply_len = 0;
int ret;
reply_len = ethnl_reply_header_size();
ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto err;
reply_len += ret;
ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto err;
reply_len += ret;
ret = -ENOMEM;
rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
ETHTOOL_A_FEATURES_HEADER, info,
&reply_payload);
if (!rskb)
goto err;
ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
wanted_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto nla_put_failure;
ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
active_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto nla_put_failure;
genlmsg_end(rskb, reply_payload);
ret = genlmsg_reply(rskb, info);
return ret;
nla_put_failure:
nlmsg_free(rskb);
WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
reply_len);
err:
GENL_SET_ERR_MSG(info, "failed to send reply message");
return ret;
}
int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
{
DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
struct ethnl_req_info req_info = {};
struct nlattr **tb = info->attrs;
struct net_device *dev;
bool mod;
int ret;
if (!tb[ETHTOOL_A_FEATURES_WANTED])
return -EINVAL;
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_FEATURES_HEADER],
genl_info_net(info), info->extack,
true);
if (ret < 0)
return ret;
dev = req_info.dev;
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
ethnl_features_to_bitmap(old_active, dev->features);
ethnl_features_to_bitmap(old_wanted, dev->wanted_features);
ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
tb[ETHTOOL_A_FEATURES_WANTED],
netdev_features_strings, info->extack);
if (ret < 0)
goto out_ops;
if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
ret = -EINVAL;
goto out_ops;
}
/* set req_wanted bits not in req_mask from old_wanted */
bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT);
bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT);
if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
dev->wanted_features &= ~dev->hw_features;
dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
__netdev_update_features(dev);
}
ethnl_features_to_bitmap(new_active, dev->features);
mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);
ret = 0;
if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;
bitmap_xor(wanted_diff_mask, req_wanted, new_active,
NETDEV_FEATURE_COUNT);
bitmap_xor(active_diff_mask, old_active, new_active,
NETDEV_FEATURE_COUNT);
bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
NETDEV_FEATURE_COUNT);
bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
NETDEV_FEATURE_COUNT);
bitmap_and(new_active, new_active, active_diff_mask,
NETDEV_FEATURE_COUNT);
ret = features_send_reply(dev, info, req_wanted,
wanted_diff_mask, new_active,
active_diff_mask, compact);
}
if (mod)
netdev_features_change(dev);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
dev_put(dev);
return ret;
}
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