Function fill_ip6

tools/ipfw/ipv6.c:340–451

* fill the addr and mask fields in the instruction as appropriate from av. * Update length as appropriate. * The following formats are allowed: * any matches any IP6. Actually returns an empty instruction. * me returns O_IP6_*_ME * * 03f1::234:123:0342 single IP6 address * 03f1::234:123:0342/24 address/masklen * 03f1::234:123:0342/ffff::ffff:ffff address/ma

 * Return 1 on success, 0 on failure.
 */
static int
fill_ip6(ipfw_insn_ip6 *cmd, char *av, int cblen, struct tidx *tstate)
{
	int len = 0;
	struct in6_addr *d = &(cmd->addr6);
	char *oav;
	/*
	 * Needed for multiple address.
	 * Note d[1] points to struct in6_add r mask6 of cmd
	 */

	cmd->o.len &= ~F_LEN_MASK;	/* zero len */

	if (strcmp(av, "any") == 0)
		return (1);

	/* Set the data for "me" opt */
	if (strcmp(av, "me") == 0 || strcmp(av, "me6") == 0) {
		cmd->o.len |= F_INSN_SIZE(ipfw_insn);
		return (1);
	}

	if (strncmp(av, "table(", 6) == 0) {
		fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate);
		return (1);
	}

	oav = av = strdup(av);
	while (av) {
		/*
		 * After the address we can have '/' indicating a mask,
		 * or ',' indicating another address follows.
		 */

		char *p, *q;
		int masklen;
		char md = '\0';

		CHECK_LENGTH(cblen,
		    1 + len + 2 * (int)F_INSN_SIZE(struct in6_addr));

		if ((q = strchr(av, ',')) ) {
			*q = '\0';
			q++;
		}

		if ((p = strchr(av, '/')) ) {
			md = *p;	/* save the separator */
			*p = '\0';	/* terminate address string */
			p++;		/* and skip past it */
		}
		/* now p points to NULL, mask or next entry */

		/* lookup stores address in *d as a side effect */
		if (lookup_host6(av, d) != 0) {
			/* XXX: failed. Free memory and go */
			errx(EX_DATAERR, "bad address \"%s\"", av);
		}