Function vfs_hang_addrlist

freebsd/kern/vfs_export.c:104–230

* Build hash lists of net addresses and hang them off the mount point. * Called by vfs_export() to set up the lists of export addresses. */

 * Called by vfs_export() to set up the lists of export addresses.
 */
static int
vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
    struct export_args *argp)
{
	struct netcred *np;
	struct radix_node_head *rnh;
	int i;
	struct radix_node *rn;
	struct sockaddr *saddr, *smask = NULL;
#if defined(INET6) || defined(INET)
	int off;
#endif
	int error;

	KASSERT(argp->ex_numsecflavors > 0,
	    ("%s: numsecflavors <= 0", __func__));
	KASSERT(argp->ex_numsecflavors < MAXSECFLAVORS,
	    ("%s: numsecflavors >= MAXSECFLAVORS", __func__));

	/*
	 * XXX: This routine converts from a uid plus gid list
	 * to a `struct ucred' (np->netc_anon).  This
	 * operation is questionable; for example, what should be done
	 * with fields like cr_uidinfo and cr_prison?  Currently, this
	 * routine does not touch them (leaves them as NULL).
	 */
	if (argp->ex_addrlen == 0) {
		if (mp->mnt_flag & MNT_DEFEXPORTED) {
			vfs_mount_error(mp,
			    "MNT_DEFEXPORTED already set for mount %p", mp);
			return (EPERM);
		}
		np = &nep->ne_defexported;
		np->netc_exflags = argp->ex_flags;
		np->netc_anon = crget();
		np->netc_anon->cr_uid = argp->ex_uid;
		crsetgroups(np->netc_anon, argp->ex_ngroups,
		    argp->ex_groups);
		np->netc_anon->cr_prison = &prison0;
		prison_hold(np->netc_anon->cr_prison);
		np->netc_numsecflavors = argp->ex_numsecflavors;
		bcopy(argp->ex_secflavors, np->netc_secflavors,
		    sizeof(np->netc_secflavors));
		MNT_ILOCK(mp);
		mp->mnt_flag |= MNT_DEFEXPORTED;
		MNT_IUNLOCK(mp);
		return (0);
	}

#if MSIZE <= 256
	if (argp->ex_addrlen > MLEN) {
		vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
		    argp->ex_addrlen, MLEN);
		return (EINVAL);
	}
#endif

	i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;