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1 | /* Kernel module to match connection tracking byte counter. |
2 | * GPL (C) 2002 Martin Devera (devik@cdi.cz). |
3 | */ |
4 | #include <linux/module.h> |
5 | #include <linux/bitops.h> |
6 | #include <linux/skbuff.h> |
7 | #include <linux/math64.h> |
8 | #include <linux/netfilter/x_tables.h> |
9 | #include <linux/netfilter/xt_connbytes.h> |
10 | #include <net/netfilter/nf_conntrack.h> |
11 | #include <net/netfilter/nf_conntrack_acct.h> |
12 | |
13 | MODULE_LICENSE("GPL"); |
14 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
15 | MODULE_DESCRIPTION("Xtables: Number of packets/bytes per connection matching"); |
16 | MODULE_ALIAS("ipt_connbytes"); |
17 | MODULE_ALIAS("ip6t_connbytes"); |
18 | |
19 | static bool |
20 | connbytes_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
21 | { |
22 | const struct xt_connbytes_info *sinfo = par->matchinfo; |
23 | const struct nf_conn *ct; |
24 | enum ip_conntrack_info ctinfo; |
25 | u_int64_t what = 0; /* initialize to make gcc happy */ |
26 | u_int64_t bytes = 0; |
27 | u_int64_t pkts = 0; |
28 | const struct nf_conn_counter *counters; |
29 | |
30 | ct = nf_ct_get(skb, &ctinfo); |
31 | if (!ct) |
32 | return false; |
33 | |
34 | counters = nf_conn_acct_find(ct); |
35 | if (!counters) |
36 | return false; |
37 | |
38 | switch (sinfo->what) { |
39 | case XT_CONNBYTES_PKTS: |
40 | switch (sinfo->direction) { |
41 | case XT_CONNBYTES_DIR_ORIGINAL: |
42 | what = counters[IP_CT_DIR_ORIGINAL].packets; |
43 | break; |
44 | case XT_CONNBYTES_DIR_REPLY: |
45 | what = counters[IP_CT_DIR_REPLY].packets; |
46 | break; |
47 | case XT_CONNBYTES_DIR_BOTH: |
48 | what = counters[IP_CT_DIR_ORIGINAL].packets; |
49 | what += counters[IP_CT_DIR_REPLY].packets; |
50 | break; |
51 | } |
52 | break; |
53 | case XT_CONNBYTES_BYTES: |
54 | switch (sinfo->direction) { |
55 | case XT_CONNBYTES_DIR_ORIGINAL: |
56 | what = counters[IP_CT_DIR_ORIGINAL].bytes; |
57 | break; |
58 | case XT_CONNBYTES_DIR_REPLY: |
59 | what = counters[IP_CT_DIR_REPLY].bytes; |
60 | break; |
61 | case XT_CONNBYTES_DIR_BOTH: |
62 | what = counters[IP_CT_DIR_ORIGINAL].bytes; |
63 | what += counters[IP_CT_DIR_REPLY].bytes; |
64 | break; |
65 | } |
66 | break; |
67 | case XT_CONNBYTES_AVGPKT: |
68 | switch (sinfo->direction) { |
69 | case XT_CONNBYTES_DIR_ORIGINAL: |
70 | bytes = counters[IP_CT_DIR_ORIGINAL].bytes; |
71 | pkts = counters[IP_CT_DIR_ORIGINAL].packets; |
72 | break; |
73 | case XT_CONNBYTES_DIR_REPLY: |
74 | bytes = counters[IP_CT_DIR_REPLY].bytes; |
75 | pkts = counters[IP_CT_DIR_REPLY].packets; |
76 | break; |
77 | case XT_CONNBYTES_DIR_BOTH: |
78 | bytes = counters[IP_CT_DIR_ORIGINAL].bytes + |
79 | counters[IP_CT_DIR_REPLY].bytes; |
80 | pkts = counters[IP_CT_DIR_ORIGINAL].packets + |
81 | counters[IP_CT_DIR_REPLY].packets; |
82 | break; |
83 | } |
84 | if (pkts != 0) |
85 | what = div64_u64(bytes, pkts); |
86 | break; |
87 | } |
88 | |
89 | if (sinfo->count.to) |
90 | return what <= sinfo->count.to && what >= sinfo->count.from; |
91 | else |
92 | return what >= sinfo->count.from; |
93 | } |
94 | |
95 | static bool connbytes_mt_check(const struct xt_mtchk_param *par) |
96 | { |
97 | const struct xt_connbytes_info *sinfo = par->matchinfo; |
98 | |
99 | if (sinfo->what != XT_CONNBYTES_PKTS && |
100 | sinfo->what != XT_CONNBYTES_BYTES && |
101 | sinfo->what != XT_CONNBYTES_AVGPKT) |
102 | return false; |
103 | |
104 | if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL && |
105 | sinfo->direction != XT_CONNBYTES_DIR_REPLY && |
106 | sinfo->direction != XT_CONNBYTES_DIR_BOTH) |
107 | return false; |
108 | |
109 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
110 | printk(KERN_WARNING "can't load conntrack support for " |
111 | "proto=%u\n", par->family); |
112 | return false; |
113 | } |
114 | |
115 | return true; |
116 | } |
117 | |
118 | static void connbytes_mt_destroy(const struct xt_mtdtor_param *par) |
119 | { |
120 | nf_ct_l3proto_module_put(par->family); |
121 | } |
122 | |
123 | static struct xt_match connbytes_mt_reg __read_mostly = { |
124 | .name = "connbytes", |
125 | .revision = 0, |
126 | .family = NFPROTO_UNSPEC, |
127 | .checkentry = connbytes_mt_check, |
128 | .match = connbytes_mt, |
129 | .destroy = connbytes_mt_destroy, |
130 | .matchsize = sizeof(struct xt_connbytes_info), |
131 | .me = THIS_MODULE, |
132 | }; |
133 | |
134 | static int __init connbytes_mt_init(void) |
135 | { |
136 | return xt_register_match(&connbytes_mt_reg); |
137 | } |
138 | |
139 | static void __exit connbytes_mt_exit(void) |
140 | { |
141 | xt_unregister_match(&connbytes_mt_reg); |
142 | } |
143 | |
144 | module_init(connbytes_mt_init); |
145 | module_exit(connbytes_mt_exit); |
146 |
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