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 HW |
3 | */ |
4 | #include <linux/module.h> | |
1977f032 | 5 | #include <linux/bitops.h> |
9d810fd2 | 6 | #include <linux/skbuff.h> |
2e4e6a17 HW |
7 | #include <linux/netfilter/x_tables.h> |
8 | #include <linux/netfilter/xt_connbytes.h> | |
587aa641 | 9 | #include <net/netfilter/nf_conntrack.h> |
9d810fd2 HW |
10 | |
11 | #include <asm/div64.h> | |
9d810fd2 HW |
12 | |
13 | MODULE_LICENSE("GPL"); | |
14 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
2ae15b64 | 15 | MODULE_DESCRIPTION("Xtables: Number of packets/bytes per connection matching"); |
2e4e6a17 | 16 | MODULE_ALIAS("ipt_connbytes"); |
73aaf935 | 17 | MODULE_ALIAS("ip6t_connbytes"); |
9d810fd2 | 18 | |
1d93a9cb | 19 | static bool |
d3c5ee6d JE |
20 | connbytes_mt(const struct sk_buff *skb, const struct net_device *in, |
21 | const struct net_device *out, const struct xt_match *match, | |
22 | const void *matchinfo, int offset, unsigned int protoff, | |
23 | bool *hotdrop) | |
9d810fd2 | 24 | { |
2e4e6a17 | 25 | const struct xt_connbytes_info *sinfo = matchinfo; |
a47362a2 | 26 | const struct nf_conn *ct; |
587aa641 | 27 | enum ip_conntrack_info ctinfo; |
9d810fd2 | 28 | u_int64_t what = 0; /* initialize to make gcc happy */ |
fb74a841 PM |
29 | u_int64_t bytes = 0; |
30 | u_int64_t pkts = 0; | |
9fb9cbb1 | 31 | const struct ip_conntrack_counter *counters; |
9d810fd2 | 32 | |
587aa641 PM |
33 | ct = nf_ct_get(skb, &ctinfo); |
34 | if (!ct) | |
1d93a9cb | 35 | return false; |
587aa641 | 36 | counters = ct->counters; |
9d810fd2 HW |
37 | |
38 | switch (sinfo->what) { | |
2e4e6a17 | 39 | case XT_CONNBYTES_PKTS: |
9d810fd2 | 40 | switch (sinfo->direction) { |
2e4e6a17 | 41 | case XT_CONNBYTES_DIR_ORIGINAL: |
9fb9cbb1 | 42 | what = counters[IP_CT_DIR_ORIGINAL].packets; |
9d810fd2 | 43 | break; |
2e4e6a17 | 44 | case XT_CONNBYTES_DIR_REPLY: |
9fb9cbb1 | 45 | what = counters[IP_CT_DIR_REPLY].packets; |
9d810fd2 | 46 | break; |
2e4e6a17 | 47 | case XT_CONNBYTES_DIR_BOTH: |
9fb9cbb1 YK |
48 | what = counters[IP_CT_DIR_ORIGINAL].packets; |
49 | what += counters[IP_CT_DIR_REPLY].packets; | |
9d810fd2 HW |
50 | break; |
51 | } | |
52 | break; | |
2e4e6a17 | 53 | case XT_CONNBYTES_BYTES: |
9d810fd2 | 54 | switch (sinfo->direction) { |
2e4e6a17 | 55 | case XT_CONNBYTES_DIR_ORIGINAL: |
9fb9cbb1 | 56 | what = counters[IP_CT_DIR_ORIGINAL].bytes; |
9d810fd2 | 57 | break; |
2e4e6a17 | 58 | case XT_CONNBYTES_DIR_REPLY: |
9fb9cbb1 | 59 | what = counters[IP_CT_DIR_REPLY].bytes; |
9d810fd2 | 60 | break; |
2e4e6a17 | 61 | case XT_CONNBYTES_DIR_BOTH: |
9fb9cbb1 YK |
62 | what = counters[IP_CT_DIR_ORIGINAL].bytes; |
63 | what += counters[IP_CT_DIR_REPLY].bytes; | |
9d810fd2 HW |
64 | break; |
65 | } | |
66 | break; | |
2e4e6a17 | 67 | case XT_CONNBYTES_AVGPKT: |
9d810fd2 | 68 | switch (sinfo->direction) { |
2e4e6a17 | 69 | case XT_CONNBYTES_DIR_ORIGINAL: |
fb74a841 PM |
70 | bytes = counters[IP_CT_DIR_ORIGINAL].bytes; |
71 | pkts = counters[IP_CT_DIR_ORIGINAL].packets; | |
9d810fd2 | 72 | break; |
2e4e6a17 | 73 | case XT_CONNBYTES_DIR_REPLY: |
fb74a841 PM |
74 | bytes = counters[IP_CT_DIR_REPLY].bytes; |
75 | pkts = counters[IP_CT_DIR_REPLY].packets; | |
9d810fd2 | 76 | break; |
2e4e6a17 | 77 | case XT_CONNBYTES_DIR_BOTH: |
fb74a841 PM |
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; | |
9d810fd2 HW |
82 | break; |
83 | } | |
fb74a841 PM |
84 | if (pkts != 0) |
85 | what = div64_64(bytes, pkts); | |
9d810fd2 HW |
86 | break; |
87 | } | |
88 | ||
89 | if (sinfo->count.to) | |
7c4e36bc | 90 | return what <= sinfo->count.to && what >= sinfo->count.from; |
9d810fd2 | 91 | else |
7c4e36bc | 92 | return what >= sinfo->count.from; |
9d810fd2 HW |
93 | } |
94 | ||
d3c5ee6d JE |
95 | static bool |
96 | connbytes_mt_check(const char *tablename, const void *ip, | |
97 | const struct xt_match *match, void *matchinfo, | |
98 | unsigned int hook_mask) | |
9d810fd2 | 99 | { |
2e4e6a17 | 100 | const struct xt_connbytes_info *sinfo = matchinfo; |
9d810fd2 | 101 | |
2e4e6a17 HW |
102 | if (sinfo->what != XT_CONNBYTES_PKTS && |
103 | sinfo->what != XT_CONNBYTES_BYTES && | |
104 | sinfo->what != XT_CONNBYTES_AVGPKT) | |
ccb79bdc | 105 | return false; |
9d810fd2 | 106 | |
2e4e6a17 HW |
107 | if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL && |
108 | sinfo->direction != XT_CONNBYTES_DIR_REPLY && | |
109 | sinfo->direction != XT_CONNBYTES_DIR_BOTH) | |
ccb79bdc | 110 | return false; |
9d810fd2 | 111 | |
11078c37 YK |
112 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { |
113 | printk(KERN_WARNING "can't load conntrack support for " | |
df54aae0 | 114 | "proto=%u\n", match->family); |
ccb79bdc | 115 | return false; |
11078c37 YK |
116 | } |
117 | ||
ccb79bdc | 118 | return true; |
9d810fd2 HW |
119 | } |
120 | ||
11078c37 | 121 | static void |
d3c5ee6d | 122 | connbytes_mt_destroy(const struct xt_match *match, void *matchinfo) |
11078c37 YK |
123 | { |
124 | nf_ct_l3proto_module_put(match->family); | |
125 | } | |
126 | ||
d3c5ee6d | 127 | static struct xt_match connbytes_mt_reg[] __read_mostly = { |
4470bbc7 PM |
128 | { |
129 | .name = "connbytes", | |
130 | .family = AF_INET, | |
d3c5ee6d JE |
131 | .checkentry = connbytes_mt_check, |
132 | .match = connbytes_mt, | |
133 | .destroy = connbytes_mt_destroy, | |
4470bbc7 PM |
134 | .matchsize = sizeof(struct xt_connbytes_info), |
135 | .me = THIS_MODULE | |
136 | }, | |
137 | { | |
138 | .name = "connbytes", | |
139 | .family = AF_INET6, | |
d3c5ee6d JE |
140 | .checkentry = connbytes_mt_check, |
141 | .match = connbytes_mt, | |
142 | .destroy = connbytes_mt_destroy, | |
4470bbc7 PM |
143 | .matchsize = sizeof(struct xt_connbytes_info), |
144 | .me = THIS_MODULE | |
145 | }, | |
9d810fd2 HW |
146 | }; |
147 | ||
d3c5ee6d | 148 | static int __init connbytes_mt_init(void) |
9d810fd2 | 149 | { |
d3c5ee6d JE |
150 | return xt_register_matches(connbytes_mt_reg, |
151 | ARRAY_SIZE(connbytes_mt_reg)); | |
9d810fd2 HW |
152 | } |
153 | ||
d3c5ee6d | 154 | static void __exit connbytes_mt_exit(void) |
9d810fd2 | 155 | { |
d3c5ee6d | 156 | xt_unregister_matches(connbytes_mt_reg, ARRAY_SIZE(connbytes_mt_reg)); |
9d810fd2 HW |
157 | } |
158 | ||
d3c5ee6d JE |
159 | module_init(connbytes_mt_init); |
160 | module_exit(connbytes_mt_exit); |