Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 1 | /* Kernel module to match connection tracking byte counter. |
| 2 | * GPL (C) 2002 Martin Devera (devik@cdi.cz). |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 3 | */ |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 4 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 5 | #include <linux/module.h> |
Jiri Slaby | 1977f03 | 2007-10-18 23:40:25 -0700 | [diff] [blame] | 6 | #include <linux/bitops.h> |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 7 | #include <linux/skbuff.h> |
Roman Zippel | 6f6d6a1 | 2008-05-01 04:34:28 -0700 | [diff] [blame] | 8 | #include <linux/math64.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 9 | #include <linux/netfilter/x_tables.h> |
| 10 | #include <linux/netfilter/xt_connbytes.h> |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 11 | #include <net/netfilter/nf_conntrack.h> |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 12 | #include <net/netfilter/nf_conntrack_acct.h> |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 13 | |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 14 | MODULE_LICENSE("GPL"); |
| 15 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 16 | MODULE_DESCRIPTION("Xtables: Number of packets/bytes per connection matching"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 17 | MODULE_ALIAS("ipt_connbytes"); |
Jan Engelhardt | 73aaf93 | 2007-10-11 14:36:40 -0700 | [diff] [blame] | 18 | MODULE_ALIAS("ip6t_connbytes"); |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 19 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 20 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 21 | connbytes_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 22 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 23 | const struct xt_connbytes_info *sinfo = par->matchinfo; |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 24 | const struct nf_conn *ct; |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 25 | enum ip_conntrack_info ctinfo; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 26 | u_int64_t what = 0; /* initialize to make gcc happy */ |
Patrick McHardy | fb74a841 | 2007-01-30 14:24:29 -0800 | [diff] [blame] | 27 | u_int64_t bytes = 0; |
| 28 | u_int64_t pkts = 0; |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 29 | const struct nf_conn_counter *counters; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 30 | |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 31 | ct = nf_ct_get(skb, &ctinfo); |
| 32 | if (!ct) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 33 | return false; |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 34 | |
| 35 | counters = nf_conn_acct_find(ct); |
| 36 | if (!counters) |
| 37 | return false; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 38 | |
| 39 | switch (sinfo->what) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 40 | case XT_CONNBYTES_PKTS: |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 41 | switch (sinfo->direction) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 42 | case XT_CONNBYTES_DIR_ORIGINAL: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 43 | what = counters[IP_CT_DIR_ORIGINAL].packets; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 44 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 45 | case XT_CONNBYTES_DIR_REPLY: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 46 | what = counters[IP_CT_DIR_REPLY].packets; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 47 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 48 | case XT_CONNBYTES_DIR_BOTH: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 49 | what = counters[IP_CT_DIR_ORIGINAL].packets; |
| 50 | what += counters[IP_CT_DIR_REPLY].packets; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 51 | break; |
| 52 | } |
| 53 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 54 | case XT_CONNBYTES_BYTES: |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 55 | switch (sinfo->direction) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 56 | case XT_CONNBYTES_DIR_ORIGINAL: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 57 | what = counters[IP_CT_DIR_ORIGINAL].bytes; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 58 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 59 | case XT_CONNBYTES_DIR_REPLY: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 60 | what = counters[IP_CT_DIR_REPLY].bytes; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 61 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 62 | case XT_CONNBYTES_DIR_BOTH: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 63 | what = counters[IP_CT_DIR_ORIGINAL].bytes; |
| 64 | what += counters[IP_CT_DIR_REPLY].bytes; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 65 | break; |
| 66 | } |
| 67 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 68 | case XT_CONNBYTES_AVGPKT: |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 69 | switch (sinfo->direction) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 70 | case XT_CONNBYTES_DIR_ORIGINAL: |
Patrick McHardy | fb74a841 | 2007-01-30 14:24:29 -0800 | [diff] [blame] | 71 | bytes = counters[IP_CT_DIR_ORIGINAL].bytes; |
| 72 | pkts = counters[IP_CT_DIR_ORIGINAL].packets; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 73 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 74 | case XT_CONNBYTES_DIR_REPLY: |
Patrick McHardy | fb74a841 | 2007-01-30 14:24:29 -0800 | [diff] [blame] | 75 | bytes = counters[IP_CT_DIR_REPLY].bytes; |
| 76 | pkts = counters[IP_CT_DIR_REPLY].packets; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 77 | break; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 78 | case XT_CONNBYTES_DIR_BOTH: |
Patrick McHardy | fb74a841 | 2007-01-30 14:24:29 -0800 | [diff] [blame] | 79 | bytes = counters[IP_CT_DIR_ORIGINAL].bytes + |
| 80 | counters[IP_CT_DIR_REPLY].bytes; |
| 81 | pkts = counters[IP_CT_DIR_ORIGINAL].packets + |
| 82 | counters[IP_CT_DIR_REPLY].packets; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 83 | break; |
| 84 | } |
Patrick McHardy | fb74a841 | 2007-01-30 14:24:29 -0800 | [diff] [blame] | 85 | if (pkts != 0) |
Roman Zippel | 6f6d6a1 | 2008-05-01 04:34:28 -0700 | [diff] [blame] | 86 | what = div64_u64(bytes, pkts); |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 87 | break; |
| 88 | } |
| 89 | |
| 90 | if (sinfo->count.to) |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 91 | return what <= sinfo->count.to && what >= sinfo->count.from; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 92 | else |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 93 | return what >= sinfo->count.from; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 96 | static int connbytes_mt_check(const struct xt_mtchk_param *par) |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 97 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 98 | const struct xt_connbytes_info *sinfo = par->matchinfo; |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 99 | int ret; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 100 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 101 | if (sinfo->what != XT_CONNBYTES_PKTS && |
| 102 | sinfo->what != XT_CONNBYTES_BYTES && |
| 103 | sinfo->what != XT_CONNBYTES_AVGPKT) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 104 | return -EINVAL; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 105 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 106 | if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL && |
| 107 | sinfo->direction != XT_CONNBYTES_DIR_REPLY && |
| 108 | sinfo->direction != XT_CONNBYTES_DIR_BOTH) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 109 | return -EINVAL; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 110 | |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 111 | ret = nf_ct_l3proto_try_module_get(par->family); |
Jan Engelhardt | f95c74e | 2010-03-21 04:05:56 +0100 | [diff] [blame] | 112 | if (ret < 0) |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 113 | pr_info("cannot load conntrack support for proto=%u\n", |
| 114 | par->family); |
Tim Gardner | a875620 | 2010-06-25 14:44:07 +0200 | [diff] [blame] | 115 | |
| 116 | /* |
| 117 | * This filter cannot function correctly unless connection tracking |
| 118 | * accounting is enabled, so complain in the hope that someone notices. |
| 119 | */ |
| 120 | if (!nf_ct_acct_enabled(par->net)) { |
| 121 | pr_warning("Forcing CT accounting to be enabled\n"); |
| 122 | nf_ct_set_acct(par->net, true); |
| 123 | } |
| 124 | |
Jan Engelhardt | f95c74e | 2010-03-21 04:05:56 +0100 | [diff] [blame] | 125 | return ret; |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 126 | } |
| 127 | |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 128 | static void connbytes_mt_destroy(const struct xt_mtdtor_param *par) |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 129 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 130 | nf_ct_l3proto_module_put(par->family); |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 131 | } |
| 132 | |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 133 | static struct xt_match connbytes_mt_reg __read_mostly = { |
| 134 | .name = "connbytes", |
| 135 | .revision = 0, |
| 136 | .family = NFPROTO_UNSPEC, |
| 137 | .checkentry = connbytes_mt_check, |
| 138 | .match = connbytes_mt, |
| 139 | .destroy = connbytes_mt_destroy, |
| 140 | .matchsize = sizeof(struct xt_connbytes_info), |
| 141 | .me = THIS_MODULE, |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 142 | }; |
| 143 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 144 | static int __init connbytes_mt_init(void) |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 145 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 146 | return xt_register_match(&connbytes_mt_reg); |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 147 | } |
| 148 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 149 | static void __exit connbytes_mt_exit(void) |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 150 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 151 | xt_unregister_match(&connbytes_mt_reg); |
Harald Welte | 9d810fd | 2005-08-13 13:56:26 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 154 | module_init(connbytes_mt_init); |
| 155 | module_exit(connbytes_mt_exit); |