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https://github.com/torvalds/linux
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a251c17aa5
The prandom_u32() function has been a deprecated inline wrapper around get_random_u32() for several releases now, and compiles down to the exact same code. Replace the deprecated wrapper with a direct call to the real function. The same also applies to get_random_int(), which is just a wrapper around get_random_u32(). This was done as a basic find and replace. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> # for sch_cake Acked-by: Chuck Lever <chuck.lever@oracle.com> # for nfsd Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> # for thunderbolt Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Acked-by: Helge Deller <deller@gmx.de> # for parisc Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
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*
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* Based on ipt_random and ipt_nth by Fabrice MARIE <fabrice@netfilter.org>.
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*/
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/net.h>
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#include <linux/slab.h>
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#include <linux/netfilter/xt_statistic.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/module.h>
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struct xt_statistic_priv {
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atomic_t count;
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} ____cacheline_aligned_in_smp;
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_DESCRIPTION("Xtables: statistics-based matching (\"Nth\", random)");
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MODULE_ALIAS("ipt_statistic");
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MODULE_ALIAS("ip6t_statistic");
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static bool
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statistic_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_statistic_info *info = par->matchinfo;
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bool ret = info->flags & XT_STATISTIC_INVERT;
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int nval, oval;
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switch (info->mode) {
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case XT_STATISTIC_MODE_RANDOM:
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if ((get_random_u32() & 0x7FFFFFFF) < info->u.random.probability)
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ret = !ret;
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break;
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case XT_STATISTIC_MODE_NTH:
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do {
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oval = atomic_read(&info->master->count);
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nval = (oval == info->u.nth.every) ? 0 : oval + 1;
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} while (atomic_cmpxchg(&info->master->count, oval, nval) != oval);
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if (nval == 0)
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ret = !ret;
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break;
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}
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return ret;
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}
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static int statistic_mt_check(const struct xt_mtchk_param *par)
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{
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struct xt_statistic_info *info = par->matchinfo;
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if (info->mode > XT_STATISTIC_MODE_MAX ||
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info->flags & ~XT_STATISTIC_MASK)
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return -EINVAL;
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info->master = kzalloc(sizeof(*info->master), GFP_KERNEL);
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if (info->master == NULL)
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return -ENOMEM;
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atomic_set(&info->master->count, info->u.nth.count);
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return 0;
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}
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static void statistic_mt_destroy(const struct xt_mtdtor_param *par)
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{
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const struct xt_statistic_info *info = par->matchinfo;
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kfree(info->master);
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}
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static struct xt_match xt_statistic_mt_reg __read_mostly = {
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.name = "statistic",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.match = statistic_mt,
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.checkentry = statistic_mt_check,
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.destroy = statistic_mt_destroy,
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.matchsize = sizeof(struct xt_statistic_info),
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.usersize = offsetof(struct xt_statistic_info, master),
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.me = THIS_MODULE,
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};
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static int __init statistic_mt_init(void)
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{
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return xt_register_match(&xt_statistic_mt_reg);
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}
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static void __exit statistic_mt_exit(void)
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{
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xt_unregister_match(&xt_statistic_mt_reg);
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}
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module_init(statistic_mt_init);
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module_exit(statistic_mt_exit);
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