| 1 | |
| 2 | |
| 3 | * (C) 2007 Patrick McHardy <[email protected]>
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| 4 |
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| 5 | #include <linux/module.h>
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| 6 | #include <linux/skbuff.h>
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| 7 | #include <linux/gen_stats.h>
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| 8 |
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| 9 | #include <linux/netfilter/x_tables.h>
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| 10 | #include <linux/netfilter/xt_rateest.h>
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| 11 | #include <net/netfilter/xt_rateest.h>
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| 12 |
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| 13 |
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| 14 | static bool
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| 15 | xt_rateest_mt(const struct sk_buff *skb, struct xt_action_param *par)
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| 16 | {
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| 17 | const struct xt_rateest_match_info *info = par->matchinfo;
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| 18 | struct gnet_stats_rate_est64 sample = {0};
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| 19 | u64 bps1, bps2, pps1, pps2;
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| 20 | bool ret = true;
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| 21 |
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| 22 | gen_estimator_read(&info->est1->rate_est, &sample);
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| 23 |
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| 24 | if (info->flags & XT_RATEEST_MATCH_DELTA) {
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| 25 | bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0;
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| 26 | pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0;
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| 27 | } else {
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| 28 | bps1 = sample.bps;
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| 29 | pps1 = sample.pps;
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| 30 | }
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| 31 |
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| 32 | if (info->flags & XT_RATEEST_MATCH_ABS) {
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| 33 | bps2 = info->bps2;
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| 34 | pps2 = info->pps2;
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| 35 | } else {
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| 36 | gen_estimator_read(&info->est2->rate_est, &sample);
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| 37 |
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| 38 | if (info->flags & XT_RATEEST_MATCH_DELTA) {
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| 39 | bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0;
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| 40 | pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0;
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| 41 | } else {
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| 42 | bps2 = sample.bps;
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| 43 | pps2 = sample.pps;
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| 44 | }
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| 45 | }
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| 46 |
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| 47 | switch (info->mode) {
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| 48 | case XT_RATEEST_MATCH_LT:
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| 49 | if (info->flags & XT_RATEEST_MATCH_BPS)
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| 50 | ret &= bps1 < bps2;
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| 51 | if (info->flags & XT_RATEEST_MATCH_PPS)
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| 52 | ret &= pps1 < pps2;
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| 53 | break;
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| 54 | case XT_RATEEST_MATCH_GT:
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| 55 | if (info->flags & XT_RATEEST_MATCH_BPS)
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| 56 | ret &= bps1 > bps2;
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| 57 | if (info->flags & XT_RATEEST_MATCH_PPS)
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| 58 | ret &= pps1 > pps2;
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| 59 | break;
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| 60 | case XT_RATEEST_MATCH_EQ:
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| 61 | if (info->flags & XT_RATEEST_MATCH_BPS)
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| 62 | ret &= bps1 == bps2;
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| 63 | if (info->flags & XT_RATEEST_MATCH_PPS)
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| 64 | ret &= pps1 == pps2;
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| 65 | break;
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| 66 | }
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| 67 |
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| 68 | ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
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| 69 | return ret;
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| 70 | }
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| 71 |
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| 72 | static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
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| 73 | {
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| 74 | struct xt_rateest_match_info *info = par->matchinfo;
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| 75 | struct xt_rateest *est1, *est2;
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| 76 | int ret = -EINVAL;
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| 77 |
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| 78 | if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
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| 79 | XT_RATEEST_MATCH_REL)) != 1)
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| 80 | goto err1;
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| 81 |
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| 82 | if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
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| 83 | goto err1;
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| 84 |
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| 85 | switch (info->mode) {
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| 86 | case XT_RATEEST_MATCH_EQ:
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| 87 | case XT_RATEEST_MATCH_LT:
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| 88 | case XT_RATEEST_MATCH_GT:
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| 89 | break;
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| 90 | default:
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| 91 | goto err1;
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| 92 | }
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| 93 |
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| 94 | if (strnlen(info->name1, sizeof(info->name1)) >= sizeof(info->name1))
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| 95 | return -ENAMETOOLONG;
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| 96 | if (strnlen(info->name2, sizeof(info->name2)) >= sizeof(info->name2))
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| 97 | return -ENAMETOOLONG;
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| 98 |
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| 99 | ret = -ENOENT;
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| 100 | est1 = xt_rateest_lookup(par->net, info->name1);
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| 101 | if (!est1)
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| 102 | goto err1;
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| 103 |
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| 104 | est2 = NULL;
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| 105 | if (info->flags & XT_RATEEST_MATCH_REL) {
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| 106 | est2 = xt_rateest_lookup(par->net, info->name2);
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| 107 | if (!est2)
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| 108 | goto err2;
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| 109 | }
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| 110 |
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| 111 | info->est1 = est1;
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| 112 | info->est2 = est2;
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| 113 | return 0;
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| 114 |
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| 115 | err2:
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| 116 | xt_rateest_put(par->net, est1);
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| 117 | err1:
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| 118 | return ret;
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| 119 | }
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| 120 |
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| 121 | static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
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| 122 | {
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| 123 | struct xt_rateest_match_info *info = par->matchinfo;
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| 124 |
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| 125 | xt_rateest_put(par->net, info->est1);
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| 126 | if (info->est2)
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| 127 | xt_rateest_put(par->net, info->est2);
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| 128 | }
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| 129 |
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| 130 | static struct xt_match xt_rateest_mt_reg __read_mostly = {
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| 131 | .name = "rateest",
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| 132 | .revision = 0,
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| 133 | .family = NFPROTO_UNSPEC,
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| 134 | .match = xt_rateest_mt,
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| 135 | .checkentry = xt_rateest_mt_checkentry,
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| 136 | .destroy = xt_rateest_mt_destroy,
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| 137 | .matchsize = sizeof(struct xt_rateest_match_info),
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| 138 | .usersize = offsetof(struct xt_rateest_match_info, est1),
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| 139 | .me = THIS_MODULE,
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| 140 | };
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| 141 |
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| 142 | static int __init xt_rateest_mt_init(void)
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| 143 | {
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| 144 | return xt_register_match(&xt_rateest_mt_reg);
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| 145 | }
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| 146 |
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| 147 | static void __exit xt_rateest_mt_fini(void)
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| 148 | {
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| 149 | xt_unregister_match(&xt_rateest_mt_reg);
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| 150 | }
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| 151 |
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| 152 | MODULE_AUTHOR("Patrick McHardy <[email protected]>");
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| 153 | MODULE_LICENSE("GPL");
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| 154 | MODULE_DESCRIPTION("xtables rate estimator match");
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| 155 | MODULE_ALIAS("ipt_rateest");
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| 156 | MODULE_ALIAS("ip6t_rateest");
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| 157 | module_init(xt_rateest_mt_init);
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| 158 | module_exit(xt_rateest_mt_fini);
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