net/netfilter/xt_RATEEST.c

38 				   struct xt_rateest *est)
42 	h = xt_rateest_hash(est->name);
43 	hlist_add_head(&est->list, &xn->hash[h]);
49 	struct xt_rateest *est;
53 	hlist_for_each_entry(est, &xn->hash[h], list) {
54 		if (strcmp(est->name, name) == 0) {
55 			est->refcnt++;
56 			return est;
66 	struct xt_rateest *est;
69 	est = __xt_rateest_lookup(xn, name);
71 	return est;
75 void xt_rateest_put(struct net *net, struct xt_rateest *est)
80 	if (--est->refcnt == 0) {
81 		hlist_del(&est->list);
82 		gen_kill_estimator(&est->rate_est);
84 		 * gen_estimator est_timer() might access est->lock or bstats,
85 		 * wait a RCU grace period before freeing 'est'
87 		kfree_rcu(est, rcu);
97 	struct gnet_stats_basic_sync *stats = &info->est->bstats;
99 	spin_lock_bh(&info->est->lock);
102 	spin_unlock_bh(&info->est->lock);
111 	struct xt_rateest *est;
114 		struct gnet_estimator	est;
118 	if (strnlen(info->name, sizeof(est->name)) >= sizeof(est->name))
124 	est = __xt_rateest_lookup(xn, info->name);
125 	if (est) {
132 		    (info->interval != est->params.interval ||
133 		     info->ewma_log != est->params.ewma_log)) {
134 			xt_rateest_put(par->net, est);
137 		info->est = est;
142 	est = kzalloc(sizeof(*est), GFP_KERNEL);
143 	if (!est)
146 	gnet_stats_basic_sync_init(&est->bstats);
147 	strscpy(est->name, info->name, sizeof(est->name));
148 	spin_lock_init(&est->lock);
149 	est->refcnt		= 1;
150 	est->params.interval	= info->interval;
151 	est->params.ewma_log	= info->ewma_log;
153 	cfg.opt.nla_len		= nla_attr_size(sizeof(cfg.est));
155 	cfg.est.interval	= info->interval;
156 	cfg.est.ewma_log	= info->ewma_log;
158 	ret = gen_new_estimator(&est->bstats, NULL, &est->rate_est,
159 				&est->lock, NULL, &cfg.opt);
163 	info->est = est;
164 	xt_rateest_hash_insert(xn, est);
169 	kfree(est);
179 	xt_rateest_put(par->net, info->est);
190 	.usersize   = offsetof(struct xt_rateest_target_info, est),