linux/net/ieee802154/nl-phy.c
Kees Cook 6396bb2215 treewide: kzalloc() -> kcalloc()
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:

        kzalloc(a * b, gfp)

with:
        kcalloc(a * b, gfp)

as well as handling cases of:

        kzalloc(a * b * c, gfp)

with:

        kzalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kzalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kzalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kzalloc
+ kcalloc
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kzalloc(sizeof(THING) * C2, ...)
|
  kzalloc(sizeof(TYPE) * C2, ...)
|
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

354 lines
8.0 KiB
C

/*
* Netlink interface for IEEE 802.15.4 stack
*
* Copyright 2007, 2008 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Written by:
* Sergey Lapin <slapin@ossfans.org>
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Maxim Osipov <maxim.osipov@siemens.com>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/if_arp.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/cfg802154.h>
#include <net/af_ieee802154.h>
#include <net/ieee802154_netdev.h>
#include <net/rtnetlink.h> /* for rtnl_{un,}lock */
#include <linux/nl802154.h>
#include "ieee802154.h"
#include "rdev-ops.h"
#include "core.h"
static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
u32 seq, int flags, struct wpan_phy *phy)
{
void *hdr;
int i, pages = 0;
uint32_t *buf = kcalloc(32, sizeof(uint32_t), GFP_KERNEL);
pr_debug("%s\n", __func__);
if (!buf)
return -EMSGSIZE;
hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
IEEE802154_LIST_PHY);
if (!hdr)
goto out;
rtnl_lock();
if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
goto nla_put_failure;
for (i = 0; i < 32; i++) {
if (phy->supported.channels[i])
buf[pages++] = phy->supported.channels[i] | (i << 27);
}
if (pages &&
nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
pages * sizeof(uint32_t), buf))
goto nla_put_failure;
rtnl_unlock();
kfree(buf);
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
rtnl_unlock();
genlmsg_cancel(msg, hdr);
out:
kfree(buf);
return -EMSGSIZE;
}
int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
{
/* Request for interface name, index, type, IEEE address,
* PAN Id, short address
*/
struct sk_buff *msg;
struct wpan_phy *phy;
const char *name;
int rc = -ENOBUFS;
pr_debug("%s\n", __func__);
if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
return -EINVAL;
name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
return -EINVAL; /* phy name should be null-terminated */
phy = wpan_phy_find(name);
if (!phy)
return -ENODEV;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
goto out_dev;
rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
0, phy);
if (rc < 0)
goto out_free;
wpan_phy_put(phy);
return genlmsg_reply(msg, info);
out_free:
nlmsg_free(msg);
out_dev:
wpan_phy_put(phy);
return rc;
}
struct dump_phy_data {
struct sk_buff *skb;
struct netlink_callback *cb;
int idx, s_idx;
};
static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
{
int rc;
struct dump_phy_data *data = _data;
pr_debug("%s\n", __func__);
if (data->idx++ < data->s_idx)
return 0;
rc = ieee802154_nl_fill_phy(data->skb,
NETLINK_CB(data->cb->skb).portid,
data->cb->nlh->nlmsg_seq,
NLM_F_MULTI,
phy);
if (rc < 0) {
data->idx--;
return rc;
}
return 0;
}
int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
{
struct dump_phy_data data = {
.cb = cb,
.skb = skb,
.s_idx = cb->args[0],
.idx = 0,
};
pr_debug("%s\n", __func__);
wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
cb->args[0] = data.idx;
return skb->len;
}
int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
struct wpan_phy *phy;
const char *name;
const char *devname;
int rc = -ENOBUFS;
struct net_device *dev;
int type = __IEEE802154_DEV_INVALID;
unsigned char name_assign_type;
pr_debug("%s\n", __func__);
if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
return -EINVAL;
name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
return -EINVAL; /* phy name should be null-terminated */
if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
!= '\0')
return -EINVAL; /* phy name should be null-terminated */
name_assign_type = NET_NAME_USER;
} else {
devname = "wpan%d";
name_assign_type = NET_NAME_ENUM;
}
if (strlen(devname) >= IFNAMSIZ)
return -ENAMETOOLONG;
phy = wpan_phy_find(name);
if (!phy)
return -ENODEV;
msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
if (!msg)
goto out_dev;
if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
IEEE802154_ADDR_LEN) {
rc = -EINVAL;
goto nla_put_failure;
}
if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
if (type >= __IEEE802154_DEV_MAX) {
rc = -EINVAL;
goto nla_put_failure;
}
}
dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname,
name_assign_type, type);
if (IS_ERR(dev)) {
rc = PTR_ERR(dev);
goto nla_put_failure;
}
dev_hold(dev);
if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
struct sockaddr addr;
addr.sa_family = ARPHRD_IEEE802154;
nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
IEEE802154_ADDR_LEN);
/* strangely enough, some callbacks (inetdev_event) from
* dev_set_mac_address require RTNL_LOCK
*/
rtnl_lock();
rc = dev_set_mac_address(dev, &addr);
rtnl_unlock();
if (rc)
goto dev_unregister;
}
if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
goto nla_put_failure;
dev_put(dev);
wpan_phy_put(phy);
return ieee802154_nl_reply(msg, info);
dev_unregister:
rtnl_lock(); /* del_iface must be called with RTNL lock */
rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
dev_put(dev);
rtnl_unlock();
nla_put_failure:
nlmsg_free(msg);
out_dev:
wpan_phy_put(phy);
return rc;
}
int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
struct wpan_phy *phy;
const char *name;
int rc;
struct net_device *dev;
pr_debug("%s\n", __func__);
if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
return -EINVAL;
name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
return -EINVAL; /* name should be null-terminated */
rc = -ENODEV;
dev = dev_get_by_name(genl_info_net(info), name);
if (!dev)
return rc;
if (dev->type != ARPHRD_IEEE802154)
goto out;
phy = dev->ieee802154_ptr->wpan_phy;
BUG_ON(!phy);
get_device(&phy->dev);
rc = -EINVAL;
/* phy name is optional, but should be checked if it's given */
if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
struct wpan_phy *phy2;
const char *pname =
nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
!= '\0')
/* name should be null-terminated */
goto out_dev;
phy2 = wpan_phy_find(pname);
if (!phy2)
goto out_dev;
if (phy != phy2) {
wpan_phy_put(phy2);
goto out_dev;
}
}
rc = -ENOBUFS;
msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
if (!msg)
goto out_dev;
rtnl_lock();
rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
/* We don't have device anymore */
dev_put(dev);
dev = NULL;
rtnl_unlock();
if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
goto nla_put_failure;
wpan_phy_put(phy);
return ieee802154_nl_reply(msg, info);
nla_put_failure:
nlmsg_free(msg);
out_dev:
wpan_phy_put(phy);
out:
if (dev)
dev_put(dev);
return rc;
}