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net/netfilter/xt_rateest.c
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81f7e3824 Initial Release, ... |
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/* * (C) 2007 Patrick McHardy <kaber@trash.net> * * 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. */ #include <linux/module.h> #include <linux/skbuff.h> #include <linux/gen_stats.h> #include <linux/netfilter/x_tables.h> #include <linux/netfilter/xt_rateest.h> #include <net/netfilter/xt_rateest.h> static bool xt_rateest_mt(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_rateest_match_info *info = par->matchinfo; struct gnet_stats_rate_est64 sample = {0}; u_int32_t bps1, bps2, pps1, pps2; bool ret = true; gen_estimator_read(&info->est1->rate_est, &sample); if (info->flags & XT_RATEEST_MATCH_DELTA) { bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0; pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0; } else { bps1 = sample.bps; pps1 = sample.pps; } if (info->flags & XT_RATEEST_MATCH_ABS) { bps2 = info->bps2; pps2 = info->pps2; } else { gen_estimator_read(&info->est2->rate_est, &sample); if (info->flags & XT_RATEEST_MATCH_DELTA) { bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0; pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0; } else { bps2 = sample.bps; pps2 = sample.pps; } } switch (info->mode) { case XT_RATEEST_MATCH_LT: if (info->flags & XT_RATEEST_MATCH_BPS) ret &= bps1 < bps2; if (info->flags & XT_RATEEST_MATCH_PPS) ret &= pps1 < pps2; break; case XT_RATEEST_MATCH_GT: if (info->flags & XT_RATEEST_MATCH_BPS) ret &= bps1 > bps2; if (info->flags & XT_RATEEST_MATCH_PPS) ret &= pps1 > pps2; break; case XT_RATEEST_MATCH_EQ: if (info->flags & XT_RATEEST_MATCH_BPS) ret &= bps1 == bps2; if (info->flags & XT_RATEEST_MATCH_PPS) ret &= pps1 == pps2; break; } ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false; return ret; } static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par) { struct xt_rateest_match_info *info = par->matchinfo; struct xt_rateest *est1, *est2; int ret = -EINVAL; if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS | XT_RATEEST_MATCH_REL)) != 1) goto err1; if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS))) goto err1; switch (info->mode) { case XT_RATEEST_MATCH_EQ: case XT_RATEEST_MATCH_LT: case XT_RATEEST_MATCH_GT: break; default: goto err1; } ret = -ENOENT; est1 = xt_rateest_lookup(info->name1); if (!est1) goto err1; est2 = NULL; if (info->flags & XT_RATEEST_MATCH_REL) { est2 = xt_rateest_lookup(info->name2); if (!est2) goto err2; } info->est1 = est1; info->est2 = est2; return 0; err2: xt_rateest_put(est1); err1: return ret; } static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par) { struct xt_rateest_match_info *info = par->matchinfo; xt_rateest_put(info->est1); if (info->est2) xt_rateest_put(info->est2); } static struct xt_match xt_rateest_mt_reg __read_mostly = { .name = "rateest", .revision = 0, .family = NFPROTO_UNSPEC, .match = xt_rateest_mt, .checkentry = xt_rateest_mt_checkentry, .destroy = xt_rateest_mt_destroy, .matchsize = sizeof(struct xt_rateest_match_info), .usersize = offsetof(struct xt_rateest_match_info, est1), .me = THIS_MODULE, }; static int __init xt_rateest_mt_init(void) { return xt_register_match(&xt_rateest_mt_reg); } static void __exit xt_rateest_mt_fini(void) { xt_unregister_match(&xt_rateest_mt_reg); } MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("xtables rate estimator match"); MODULE_ALIAS("ipt_rateest"); MODULE_ALIAS("ip6t_rateest"); module_init(xt_rateest_mt_init); module_exit(xt_rateest_mt_fini); |