Added support for 2.6.27 kernel
[openwrt.git] / package / base-files / files / usr / lib / common.awk
1 # Copyright (C) 2006 OpenWrt.org
2
3 function portstr(type, str) {
4 gsub(/-/, ":", str)
5 if (insmod_mport != 1) {
6 print "insmod ipt_multiport >&- 2>&-"
7 insmod_mport = 1
8 }
9 if (type == "src") return " -m multiport --sports " str
10 else return " -m multiport --dports " str
11 }
12
13 function str2ipt(str) {
14 str2data(str)
15 _cmd = ""
16 if (_l["src"] != "") _cmd = _cmd " -s " _l["src"]
17 if (_l["dest"] != "") _cmd = _cmd " -d " _l["dest"]
18 if (_l["proto"] != "") {
19 _cmd = _cmd " -p " _l["proto"]
20 }
21 # scripts need to check for proto="" and emit two rules in that case
22 if ((_l["proto"] == "") || (_l["proto"] == "tcp") || (_l["proto"] == "udp")) {
23 if (_l["sport"] != "") _cmd = _cmd portstr("src", _l["sport"])
24 if (_l["dport"] != "") _cmd = _cmd portstr("dest", _l["dport"])
25 }
26 if (_l["layer7"] != "") {
27 if (insmod_l7 != 1) {
28 print "insmod ipt_layer7 >&- 2>&-"
29 insmod_l7 = 1
30 }
31 _cmd = _cmd " -m layer7 --l7proto " _l["layer7"]
32 }
33 return _cmd
34 }
35
36 function str2data(str) {
37 delete _l
38 _n = split(str, _o, "[\t ]")
39 for (_i = 1; _i <= _n; _i++) {
40 _n2 = split(_o[_i], _c, "=")
41 if (_n2 == 2) _l[_c[1]] = _c[2]
42 }
43 }
44
45 function bitcount(c) {
46 c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
47 c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
48 c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
49 c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
50 c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
51 return c
52 }
53
54 function validate_netmask(nm) {
55 return and(-nm,compl(nm))
56 }
57
58 function ip2int(ip) {
59 for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x])
60 return ret
61 }
62
63 function int2ip(ip,ret,x) {
64 ret=and(ip,255)
65 ip=rshift(ip,8)
66 for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
67 return ret
68 }
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