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Commit | Line | Data |
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9d810fd2 HW |
1 | /* Kernel module to match connection tracking byte counter. |
2 | * GPL (C) 2002 Martin Devera (devik@cdi.cz). | |
9d810fd2 | 3 | */ |
8bee4bad | 4 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9d810fd2 | 5 | #include <linux/module.h> |
1977f032 | 6 | #include <linux/bitops.h> |
9d810fd2 | 7 | #include <linux/skbuff.h> |
6f6d6a1a | 8 | #include <linux/math64.h> |
2e4e6a17 HW |
9 | #include <linux/netfilter/x_tables.h> |
10 | #include <linux/netfilter/xt_connbytes.h> | |
587aa641 | 11 | #include <net/netfilter/nf_conntrack.h> |
58401572 | 12 | #include <net/netfilter/nf_conntrack_acct.h> |
9d810fd2 | 13 | |
9d810fd2 HW |
14 | MODULE_LICENSE("GPL"); |
15 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
2ae15b64 | 16 | MODULE_DESCRIPTION("Xtables: Number of packets/bytes per connection matching"); |
2e4e6a17 | 17 | MODULE_ALIAS("ipt_connbytes"); |
73aaf935 | 18 | MODULE_ALIAS("ip6t_connbytes"); |
9d810fd2 | 19 | |
1d93a9cb | 20 | static bool |
62fc8051 | 21 | connbytes_mt(const struct sk_buff *skb, struct xt_action_param *par) |
9d810fd2 | 22 | { |
f7108a20 | 23 | const struct xt_connbytes_info *sinfo = par->matchinfo; |
a47362a2 | 24 | const struct nf_conn *ct; |
587aa641 | 25 | enum ip_conntrack_info ctinfo; |
9d810fd2 | 26 | u_int64_t what = 0; /* initialize to make gcc happy */ |
fb74a841 PM |
27 | u_int64_t bytes = 0; |
28 | u_int64_t pkts = 0; | |
f7b13e43 | 29 | const struct nf_conn_acct *acct; |
58401572 | 30 | const struct nf_conn_counter *counters; |
9d810fd2 | 31 | |
587aa641 PM |
32 | ct = nf_ct_get(skb, &ctinfo); |
33 | if (!ct) | |
1d93a9cb | 34 | return false; |
58401572 | 35 | |
f7b13e43 HE |
36 | acct = nf_conn_acct_find(ct); |
37 | if (!acct) | |
58401572 | 38 | return false; |
9d810fd2 | 39 | |
f7b13e43 | 40 | counters = acct->counter; |
9d810fd2 | 41 | switch (sinfo->what) { |
2e4e6a17 | 42 | case XT_CONNBYTES_PKTS: |
9d810fd2 | 43 | switch (sinfo->direction) { |
2e4e6a17 | 44 | case XT_CONNBYTES_DIR_ORIGINAL: |
b3e0bfa7 | 45 | what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets); |
9d810fd2 | 46 | break; |
2e4e6a17 | 47 | case XT_CONNBYTES_DIR_REPLY: |
b3e0bfa7 | 48 | what = atomic64_read(&counters[IP_CT_DIR_REPLY].packets); |
9d810fd2 | 49 | break; |
2e4e6a17 | 50 | case XT_CONNBYTES_DIR_BOTH: |
b3e0bfa7 ED |
51 | what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets); |
52 | what += atomic64_read(&counters[IP_CT_DIR_REPLY].packets); | |
9d810fd2 HW |
53 | break; |
54 | } | |
55 | break; | |
2e4e6a17 | 56 | case XT_CONNBYTES_BYTES: |
9d810fd2 | 57 | switch (sinfo->direction) { |
2e4e6a17 | 58 | case XT_CONNBYTES_DIR_ORIGINAL: |
b3e0bfa7 | 59 | what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes); |
9d810fd2 | 60 | break; |
2e4e6a17 | 61 | case XT_CONNBYTES_DIR_REPLY: |
b3e0bfa7 | 62 | what = atomic64_read(&counters[IP_CT_DIR_REPLY].bytes); |
9d810fd2 | 63 | break; |
2e4e6a17 | 64 | case XT_CONNBYTES_DIR_BOTH: |
b3e0bfa7 ED |
65 | what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes); |
66 | what += atomic64_read(&counters[IP_CT_DIR_REPLY].bytes); | |
9d810fd2 HW |
67 | break; |
68 | } | |
69 | break; | |
2e4e6a17 | 70 | case XT_CONNBYTES_AVGPKT: |
9d810fd2 | 71 | switch (sinfo->direction) { |
2e4e6a17 | 72 | case XT_CONNBYTES_DIR_ORIGINAL: |
b3e0bfa7 ED |
73 | bytes = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes); |
74 | pkts = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets); | |
9d810fd2 | 75 | break; |
2e4e6a17 | 76 | case XT_CONNBYTES_DIR_REPLY: |
b3e0bfa7 ED |
77 | bytes = atomic64_read(&counters[IP_CT_DIR_REPLY].bytes); |
78 | pkts = atomic64_read(&counters[IP_CT_DIR_REPLY].packets); | |
9d810fd2 | 79 | break; |
2e4e6a17 | 80 | case XT_CONNBYTES_DIR_BOTH: |
b3e0bfa7 ED |
81 | bytes = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes) + |
82 | atomic64_read(&counters[IP_CT_DIR_REPLY].bytes); | |
83 | pkts = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets) + | |
84 | atomic64_read(&counters[IP_CT_DIR_REPLY].packets); | |
9d810fd2 HW |
85 | break; |
86 | } | |
fb74a841 | 87 | if (pkts != 0) |
6f6d6a1a | 88 | what = div64_u64(bytes, pkts); |
9d810fd2 HW |
89 | break; |
90 | } | |
91 | ||
0354b48f | 92 | if (sinfo->count.to >= sinfo->count.from) |
7c4e36bc | 93 | return what <= sinfo->count.to && what >= sinfo->count.from; |
0354b48f FW |
94 | else /* inverted */ |
95 | return what < sinfo->count.to || what > sinfo->count.from; | |
9d810fd2 HW |
96 | } |
97 | ||
b0f38452 | 98 | static int connbytes_mt_check(const struct xt_mtchk_param *par) |
9d810fd2 | 99 | { |
9b4fce7a | 100 | const struct xt_connbytes_info *sinfo = par->matchinfo; |
4a5a5c73 | 101 | int ret; |
9d810fd2 | 102 | |
2e4e6a17 HW |
103 | if (sinfo->what != XT_CONNBYTES_PKTS && |
104 | sinfo->what != XT_CONNBYTES_BYTES && | |
105 | sinfo->what != XT_CONNBYTES_AVGPKT) | |
bd414ee6 | 106 | return -EINVAL; |
9d810fd2 | 107 | |
2e4e6a17 HW |
108 | if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL && |
109 | sinfo->direction != XT_CONNBYTES_DIR_REPLY && | |
110 | sinfo->direction != XT_CONNBYTES_DIR_BOTH) | |
bd414ee6 | 111 | return -EINVAL; |
9d810fd2 | 112 | |
ecb2421b | 113 | ret = nf_ct_netns_get(par->net, par->family); |
f95c74e3 | 114 | if (ret < 0) |
8bee4bad JE |
115 | pr_info("cannot load conntrack support for proto=%u\n", |
116 | par->family); | |
a8756201 TG |
117 | |
118 | /* | |
119 | * This filter cannot function correctly unless connection tracking | |
120 | * accounting is enabled, so complain in the hope that someone notices. | |
121 | */ | |
122 | if (!nf_ct_acct_enabled(par->net)) { | |
b167a37c | 123 | pr_warn("Forcing CT accounting to be enabled\n"); |
a8756201 TG |
124 | nf_ct_set_acct(par->net, true); |
125 | } | |
126 | ||
f95c74e3 | 127 | return ret; |
9d810fd2 HW |
128 | } |
129 | ||
6be3d859 | 130 | static void connbytes_mt_destroy(const struct xt_mtdtor_param *par) |
11078c37 | 131 | { |
ecb2421b | 132 | nf_ct_netns_put(par->net, par->family); |
11078c37 YK |
133 | } |
134 | ||
92f3b2b1 JE |
135 | static struct xt_match connbytes_mt_reg __read_mostly = { |
136 | .name = "connbytes", | |
137 | .revision = 0, | |
138 | .family = NFPROTO_UNSPEC, | |
139 | .checkentry = connbytes_mt_check, | |
140 | .match = connbytes_mt, | |
141 | .destroy = connbytes_mt_destroy, | |
142 | .matchsize = sizeof(struct xt_connbytes_info), | |
143 | .me = THIS_MODULE, | |
9d810fd2 HW |
144 | }; |
145 | ||
d3c5ee6d | 146 | static int __init connbytes_mt_init(void) |
9d810fd2 | 147 | { |
92f3b2b1 | 148 | return xt_register_match(&connbytes_mt_reg); |
9d810fd2 HW |
149 | } |
150 | ||
d3c5ee6d | 151 | static void __exit connbytes_mt_exit(void) |
9d810fd2 | 152 | { |
92f3b2b1 | 153 | xt_unregister_match(&connbytes_mt_reg); |
9d810fd2 HW |
154 | } |
155 | ||
d3c5ee6d JE |
156 | module_init(connbytes_mt_init); |
157 | module_exit(connbytes_mt_exit); |