96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <ip.h>
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static uint8_t classmask[4][16] = {
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00,
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00,
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0x00,0x00,
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0x00,
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};
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static uint8_t v6loopback[IPaddrlen] = {
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0x01
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};
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static uint8_t v6linklocal[IPaddrlen] = {
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0xfe, 0x80, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static uint8_t v6linklocalmask[IPaddrlen] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static int v6llpreflen = 8; /* link-local prefix length in bytes */
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static uint8_t v6multicast[IPaddrlen] = {
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0xff, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static uint8_t v6multicastmask[IPaddrlen] = {
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0xff, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static int v6mcpreflen = 1; /* multicast prefix length */
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static uint8_t v6solicitednode[IPaddrlen] = {
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0xff, 0x02, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0x01,
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0xff, 0, 0, 0
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};
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static uint8_t v6solicitednodemask[IPaddrlen] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0x0, 0x0, 0x0
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};
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static int v6snpreflen = 13;
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uint8_t*
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defmask(uint8_t *ip)
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{
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if(isv4(ip))
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return classmask[ip[IPv4off]>>6];
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else {
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if(ipcmp(ip, v6loopback) == 0)
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return IPallbits;
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else if(memcmp(ip, v6linklocal, v6llpreflen) == 0)
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return v6linklocalmask;
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else if(memcmp(ip, v6solicitednode, v6snpreflen) == 0)
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return v6solicitednodemask;
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else if(memcmp(ip, v6multicast, v6mcpreflen) == 0)
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return v6multicastmask;
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return IPallbits;
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}
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}
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void
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maskip(uint8_t *from, uint8_t *mask, uint8_t *to)
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{
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int i;
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for(i = 0; i < IPaddrlen; i++)
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to[i] = from[i] & mask[i];
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}
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