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