1*58da3067SDavid du Colombier #include <u.h>
2*58da3067SDavid du Colombier #include <libc.h>
3*58da3067SDavid du Colombier #include <ip.h>
4*58da3067SDavid du Colombier
5*58da3067SDavid du Colombier /*
6*58da3067SDavid du Colombier * well known IP addresses
7*58da3067SDavid du Colombier */
8*58da3067SDavid du Colombier uchar IPv4bcast[IPaddrlen] = {
9*58da3067SDavid du Colombier 0, 0, 0, 0,
10*58da3067SDavid du Colombier 0, 0, 0, 0,
11*58da3067SDavid du Colombier 0, 0, 0xff, 0xff,
12*58da3067SDavid du Colombier 0xff, 0xff, 0xff, 0xff
13*58da3067SDavid du Colombier };
14*58da3067SDavid du Colombier uchar IPv4allsys[IPaddrlen] = {
15*58da3067SDavid du Colombier 0, 0, 0, 0,
16*58da3067SDavid du Colombier 0, 0, 0, 0,
17*58da3067SDavid du Colombier 0, 0, 0xff, 0xff,
18*58da3067SDavid du Colombier 0xe0, 0, 0, 0x01
19*58da3067SDavid du Colombier };
20*58da3067SDavid du Colombier uchar IPv4allrouter[IPaddrlen] = {
21*58da3067SDavid du Colombier 0, 0, 0, 0,
22*58da3067SDavid du Colombier 0, 0, 0, 0,
23*58da3067SDavid du Colombier 0, 0, 0xff, 0xff,
24*58da3067SDavid du Colombier 0xe0, 0, 0, 0x02
25*58da3067SDavid du Colombier };
26*58da3067SDavid du Colombier uchar IPallbits[IPaddrlen] = {
27*58da3067SDavid du Colombier 0xff, 0xff, 0xff, 0xff,
28*58da3067SDavid du Colombier 0xff, 0xff, 0xff, 0xff,
29*58da3067SDavid du Colombier 0xff, 0xff, 0xff, 0xff,
30*58da3067SDavid du Colombier 0xff, 0xff, 0xff, 0xff
31*58da3067SDavid du Colombier };
32*58da3067SDavid du Colombier uchar IPnoaddr[IPaddrlen];
33*58da3067SDavid du Colombier
34*58da3067SDavid du Colombier /*
35*58da3067SDavid du Colombier * prefix of all v4 addresses
36*58da3067SDavid du Colombier */
37*58da3067SDavid du Colombier uchar v4prefix[IPaddrlen] = {
38*58da3067SDavid du Colombier 0, 0, 0, 0,
39*58da3067SDavid du Colombier 0, 0, 0, 0,
40*58da3067SDavid du Colombier 0, 0, 0xff, 0xff,
41*58da3067SDavid du Colombier 0, 0, 0, 0
42*58da3067SDavid du Colombier };
43*58da3067SDavid du Colombier
44*58da3067SDavid du Colombier int
isv4(uchar * ip)45*58da3067SDavid du Colombier isv4(uchar *ip)
46*58da3067SDavid du Colombier {
47*58da3067SDavid du Colombier return memcmp(ip, v4prefix, IPv4off) == 0;
48*58da3067SDavid du Colombier }
49*58da3067SDavid du Colombier
50*58da3067SDavid du Colombier /*
51*58da3067SDavid du Colombier * the following routines are unrolled with no memset's to speed
52*58da3067SDavid du Colombier * up the usual case
53*58da3067SDavid du Colombier */
54*58da3067SDavid du Colombier void
v4tov6(uchar * v6,uchar * v4)55*58da3067SDavid du Colombier v4tov6(uchar *v6, uchar *v4)
56*58da3067SDavid du Colombier {
57*58da3067SDavid du Colombier v6[0] = 0;
58*58da3067SDavid du Colombier v6[1] = 0;
59*58da3067SDavid du Colombier v6[2] = 0;
60*58da3067SDavid du Colombier v6[3] = 0;
61*58da3067SDavid du Colombier v6[4] = 0;
62*58da3067SDavid du Colombier v6[5] = 0;
63*58da3067SDavid du Colombier v6[6] = 0;
64*58da3067SDavid du Colombier v6[7] = 0;
65*58da3067SDavid du Colombier v6[8] = 0;
66*58da3067SDavid du Colombier v6[9] = 0;
67*58da3067SDavid du Colombier v6[10] = 0xff;
68*58da3067SDavid du Colombier v6[11] = 0xff;
69*58da3067SDavid du Colombier v6[12] = v4[0];
70*58da3067SDavid du Colombier v6[13] = v4[1];
71*58da3067SDavid du Colombier v6[14] = v4[2];
72*58da3067SDavid du Colombier v6[15] = v4[3];
73*58da3067SDavid du Colombier }
74*58da3067SDavid du Colombier
75*58da3067SDavid du Colombier int
v6tov4(uchar * v4,uchar * v6)76*58da3067SDavid du Colombier v6tov4(uchar *v4, uchar *v6)
77*58da3067SDavid du Colombier {
78*58da3067SDavid du Colombier if(v6[0] == 0
79*58da3067SDavid du Colombier && v6[1] == 0
80*58da3067SDavid du Colombier && v6[2] == 0
81*58da3067SDavid du Colombier && v6[3] == 0
82*58da3067SDavid du Colombier && v6[4] == 0
83*58da3067SDavid du Colombier && v6[5] == 0
84*58da3067SDavid du Colombier && v6[6] == 0
85*58da3067SDavid du Colombier && v6[7] == 0
86*58da3067SDavid du Colombier && v6[8] == 0
87*58da3067SDavid du Colombier && v6[9] == 0
88*58da3067SDavid du Colombier && v6[10] == 0xff
89*58da3067SDavid du Colombier && v6[11] == 0xff)
90*58da3067SDavid du Colombier {
91*58da3067SDavid du Colombier v4[0] = v6[12];
92*58da3067SDavid du Colombier v4[1] = v6[13];
93*58da3067SDavid du Colombier v4[2] = v6[14];
94*58da3067SDavid du Colombier v4[3] = v6[15];
95*58da3067SDavid du Colombier return 0;
96*58da3067SDavid du Colombier } else {
97*58da3067SDavid du Colombier memset(v4, 0, 4);
98*58da3067SDavid du Colombier if(memcmp(v6, IPnoaddr, IPaddrlen) == 0)
99*58da3067SDavid du Colombier return 0;
100*58da3067SDavid du Colombier return -1;
101*58da3067SDavid du Colombier }
102*58da3067SDavid du Colombier }
103