Function delete

tools/ndp/ndp.c:569–632

* Delete a neighbor cache entry */

 * Delete a neighbor cache entry
 */
static int
delete(char *host)
{
	struct sockaddr_in6 *sin = &sin_m;
	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
	register char *cp = m_rtmsg.m_space;
	struct sockaddr_dl *sdl;
	struct addrinfo hints, *res;
	int gai_error;

	getsocket();
	sin_m = blank_sin;

	bzero(&hints, sizeof(hints));
	hints.ai_family = AF_INET6;
	gai_error = getaddrinfo(host, NULL, &hints, &res);
	if (gai_error) {
		fprintf(stderr, "ndp: %s: %s\n", host,
		    gai_strerror(gai_error));
		return 1;
	}
	sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
	sin->sin6_scope_id =
	    ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
	if (rtmsg(RTM_GET) < 0) {
		errx(1, "RTM_GET(%s) failed", host);
		/* NOTREACHED */
	}
	sin = (struct sockaddr_in6 *)(rtm + 1);
	sdl = (struct sockaddr_dl *)(ALIGN(sin->sin6_len) + (char *)sin);
	if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) {
		if (sdl->sdl_family == AF_LINK &&
		    !(rtm->rtm_flags & RTF_GATEWAY)) {
			goto delete;
		}
		fprintf(stderr, "delete: cannot delete non-NDP entry\n");
		return 1;
	}

delete:
	if (sdl->sdl_family != AF_LINK) {
		printf("cannot locate %s\n", host);
		return (1);
	}
	/*
	 * need to reinit the field because it has rt_key
	 * but we want the actual address
	 */
	NEXTADDR(RTA_DST, sin_m);
	rtm->rtm_flags |= RTF_LLDATA;
	if (rtmsg(RTM_DELETE) == 0) {
#ifndef FSTACK
		getnameinfo((struct sockaddr *)sin,
		    sin->sin6_len, host_buf,
		    sizeof(host_buf), NULL, 0,
		    (nflag ? NI_NUMERICHOST : 0));
#else
		inet_ntop(AF_INET6_LINUX, &sin->sin6_addr, host_buf, sizeof(host_buf));