104 lines
2.1 KiB
C
104 lines
2.1 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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/*
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* linklocal - print ipv6 link-local or 6to4 address of a mac address.
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* eui is ieee's extended unique identifier, per rfc2373.
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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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enum {
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Mac0mcast = 1<<0, /* multicast address */
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Mac0localadm = 1<<1, /* locally-administered address, */
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V60globaladm = 1<<1, /* but ipv6 reverses the meaning */
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};
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static char *v4_6to4;
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static void
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usage(void)
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{
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fprint(2, "usage: %s [-t ipv4] ether...\n", argv0);
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exits("usage");
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}
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void
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ea2eui64(uint8_t *lla, uint8_t *ea)
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{
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*lla++ = *ea++ | V60globaladm; /* oui (company id) */
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*lla++ = *ea++; /* " */
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*lla++ = *ea++; /* " */
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*lla++ = 0xFF; /* mac-48 in eui-64 (sic) */
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*lla++ = 0xFE; /* " */
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*lla++ = *ea++; /* manufacturer-assigned */
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*lla++ = *ea++; /* " */
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*lla = *ea; /* " */
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}
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void
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eaip26to4(uint8_t *lla, uint8_t *ea, uint8_t *ipv4)
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{
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*lla++ = 0x20; /* 6to4 address */
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*lla++ = 0x02; /* " */
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memmove(lla, ipv4, IPv4addrlen);
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lla += IPv4addrlen;
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memset(lla, 0, 2);
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ea2eui64(lla + 2, ea);
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}
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void
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ea2lla(uint8_t *lla, uint8_t *ea)
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{
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*lla++ = 0xFE; /* link-local v6 */
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*lla++ = 0x80; /* " */
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memset(lla, 0, 6);
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ea2eui64(lla + 6, ea);
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}
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static void
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process(char *ether)
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{
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uint8_t ethaddr[6], ipaddr[IPaddrlen], ipv4[IPv4addrlen];
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if (parseether(ethaddr, ether) < 0)
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sysfatal("%s: not an ether address", ether);
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if (v4_6to4) {
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v4parseip(ipv4, v4_6to4);
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eaip26to4(ipaddr, ethaddr, ipv4);
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} else
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ea2lla(ipaddr, ethaddr);
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print("%I\n", ipaddr);
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}
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void
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main(int argc, char *argv[])
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{
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int i;
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ARGBEGIN {
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case 't':
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v4_6to4 = EARGF(usage());
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break;
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default:
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usage();
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break;
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} ARGEND
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fmtinstall('I', eipfmt);
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if (argc <= 0)
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usage();
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for (i = 0; i < argc; i++)
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process(argv[i]);
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exits(0);
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}
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