Function if_getgroup

freebsd/net/if.c:1676–1707

* Stores all groups from an interface in memory pointed to by ifgr. */

 * Stores all groups from an interface in memory pointed to by ifgr.
 */
static int
if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp)
{
	int			 len, error;
	struct ifg_list		*ifgl;
	struct ifg_req		 ifgrq, *ifgp;

	NET_EPOCH_ASSERT();

	if (ifgr->ifgr_len == 0) {
		CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
			ifgr->ifgr_len += sizeof(struct ifg_req);
		return (0);
	}

	len = ifgr->ifgr_len;
	ifgp = ifgr_groups_get(ifgr);
	/* XXX: wire */
	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
		if (len < sizeof(ifgrq))
			return (EINVAL);
		bzero(&ifgrq, sizeof ifgrq);
		strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
		    sizeof(ifgrq.ifgrq_group));
		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req))))
			return (error);
		len -= sizeof(ifgrq);
		ifgp++;
	}

	return (0);
}

/*
 * Stores all members of a group in memory pointed to by igfr