cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/xt_quota.c

Directory: net/netfilter
/*
 * netfilter module to enforce network quotas
 *
 * Sam Johnston <samj@samj.net>
 */
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_quota.h>
#include <linux/module.h>


struct xt_quota_priv {
	
spinlock_t	lock;
	
uint64_t	quota;
};

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sam Johnston <samj@samj.net>");
MODULE_DESCRIPTION("Xtables: countdown quota match");
MODULE_ALIAS("ipt_quota");
MODULE_ALIAS("ip6t_quota");


static bool quota_mt(const struct sk_buff *skb, struct xt_action_param *par) { struct xt_quota_info *q = (void *)par->matchinfo; struct xt_quota_priv *priv = q->master; bool ret = q->flags & XT_QUOTA_INVERT; spin_lock_bh(&priv->lock); if (priv->quota >= skb->len) { priv->quota -= skb->len; ret = !ret; } else { /* we do not allow even small packets from now on */ priv->quota = 0; } spin_unlock_bh(&priv->lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy7573.53%114.29%
Jan Engelhardt2120.59%571.43%
Changli Gao65.88%114.29%
Total102100.00%7100.00%


static int quota_mt_check(const struct xt_mtchk_param *par) { struct xt_quota_info *q = par->matchinfo; if (q->flags & ~XT_QUOTA_MASK) return -EINVAL; q->master = kmalloc(sizeof(*q->master), GFP_KERNEL); if (q->master == NULL) return -ENOMEM; spin_lock_init(&q->master->lock); q->master->quota = q->quota; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt4248.84%777.78%
Patrick McHardy3439.53%111.11%
Changli Gao1011.63%111.11%
Total86100.00%9100.00%


static void quota_mt_destroy(const struct xt_mtdtor_param *par) { const struct xt_quota_info *q = par->matchinfo; kfree(q->master); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt29100.00%1100.00%
Total29100.00%1100.00%

static struct xt_match quota_mt_reg __read_mostly = { .name = "quota", .revision = 0, .family = NFPROTO_UNSPEC, .match = quota_mt, .checkentry = quota_mt_check, .destroy = quota_mt_destroy, .matchsize = sizeof(struct xt_quota_info), .usersize = offsetof(struct xt_quota_info, master), .me = THIS_MODULE, };
static int __init quota_mt_init(void) { return xt_register_match(&quota_mt_reg); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy1275.00%250.00%
Jan Engelhardt425.00%250.00%
Total16100.00%4100.00%


static void __exit quota_mt_exit(void) { xt_unregister_match(&quota_mt_reg); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy1173.33%250.00%
Jan Engelhardt426.67%250.00%
Total15100.00%4100.00%

module_init(quota_mt_init); module_exit(quota_mt_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy21356.65%420.00%
Jan Engelhardt12733.78%1260.00%
Changli Gao195.05%15.00%
Willem de Bruijn112.93%15.00%
Tejun Heo30.80%15.00%
Paul Gortmaker30.80%15.00%
Total376100.00%20100.00%
Directory: net/netfilter
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