Exemplo n.º 1
0
int
in6_pcbbind(
	struct inpcb *inp,
	struct sockaddr *nam,
	struct proc *p)
{
	struct socket *so = inp->inp_socket;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
	u_short	lport = 0;
	int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);

	if (!in6_ifaddrs) /* XXX broken! */
		return (EADDRNOTAVAIL);
	if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
		return(EINVAL);
	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
		wild = 1;
	socket_unlock(so, 0); /* keep reference */
	lck_rw_lock_exclusive(pcbinfo->mtx);
	if (nam) {
		sin6 = (struct sockaddr_in6 *)nam;
		if (nam->sa_len != sizeof(*sin6)) {
			lck_rw_done(pcbinfo->mtx);
			socket_lock(so, 0);
			return(EINVAL);
		}
		/*
		 * family check.
		 */
		if (nam->sa_family != AF_INET6) {
			lck_rw_done(pcbinfo->mtx);
			socket_lock(so, 0);
			return(EAFNOSUPPORT);
		}

		/* KAME hack: embed scopeid */
		if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) {
			lck_rw_done(pcbinfo->mtx);
			socket_lock(so, 0);
			return EINVAL;
		}
		/* this must be cleared for ifa_ifwithaddr() */
		sin6->sin6_scope_id = 0;

		lport = sin6->sin6_port;
		if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
			/*
			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
			 * allow compepte duplication of binding if
			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
			 * and a multicast address is bound on both
			 * new and duplicated sockets.
			 */
			if (so->so_options & SO_REUSEADDR)
				reuseport = SO_REUSEADDR|SO_REUSEPORT;
		} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
			struct ifaddr *ia = NULL;

			sin6->sin6_port = 0;		/* yech... */
			if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) {
				lck_rw_done(pcbinfo->mtx);
				socket_lock(so, 0);
				return(EADDRNOTAVAIL);
			}

			/*
			 * XXX: bind to an anycast address might accidentally
			 * cause sending a packet with anycast source address.
			 * We should allow to bind to a deprecated address, since
			 * the application dare to use it.
			 */
			if (ia &&
			    ((struct in6_ifaddr *)ia)->ia6_flags &
			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
			    	ifafree(ia);
				lck_rw_done(pcbinfo->mtx);
				socket_lock(so, 0);
				return(EADDRNOTAVAIL);
			}
			ifafree(ia);
			ia = NULL;
		}
		if (lport) {
			struct inpcb *t;

			/* GROSS */
			if (ntohs(lport) < IPV6PORT_RESERVED && p &&
                            ((so->so_state & SS_PRIV) == 0)) {
				lck_rw_done(pcbinfo->mtx);
				socket_lock(so, 0);
				return(EACCES);
			}

			if (so->so_uid &&
			    !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
				t = in6_pcblookup_local_and_cleanup(pcbinfo,
				    &sin6->sin6_addr, lport,
				    INPLOOKUP_WILDCARD);
				if (t &&
				    (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
				     !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
				     (t->inp_socket->so_options &
				      SO_REUSEPORT) == 0) &&
				     (so->so_uid != t->inp_socket->so_uid) &&
				     ((t->inp_socket->so_flags & SOF_REUSESHAREUID) == 0)) {
					lck_rw_done(pcbinfo->mtx);
					socket_lock(so, 0);
					return (EADDRINUSE);
				}
				if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
				    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
					struct sockaddr_in sin;

					in6_sin6_2_sin(&sin, sin6);
					t = in_pcblookup_local_and_cleanup(pcbinfo,
						sin.sin_addr, lport,
						INPLOOKUP_WILDCARD);
					if (t && (t->inp_socket->so_options & SO_REUSEPORT) == 0 &&
					    (so->so_uid !=
					     t->inp_socket->so_uid) &&
					    (ntohl(t->inp_laddr.s_addr) !=
					     INADDR_ANY ||
					     INP_SOCKAF(so) ==
					     INP_SOCKAF(t->inp_socket))) {

						lck_rw_done(pcbinfo->mtx);
						socket_lock(so, 0);
						return (EADDRINUSE);
					}
				}
			}
			t = in6_pcblookup_local_and_cleanup(pcbinfo, &sin6->sin6_addr,
						lport, wild);
			if (t && (reuseport & t->inp_socket->so_options) == 0) {
				lck_rw_done(pcbinfo->mtx);
				socket_lock(so, 0);
				return(EADDRINUSE);
			}
			if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
			    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
				struct sockaddr_in sin;

				in6_sin6_2_sin(&sin, sin6);
				t = in_pcblookup_local_and_cleanup(pcbinfo, sin.sin_addr,
						       lport, wild);
				if (t &&
				    (reuseport & t->inp_socket->so_options)
				    == 0 &&
				    (ntohl(t->inp_laddr.s_addr)
				     != INADDR_ANY ||
				     INP_SOCKAF(so) ==
				     INP_SOCKAF(t->inp_socket))) {
					lck_rw_done(pcbinfo->mtx);
					socket_lock(so, 0);
					return (EADDRINUSE);
				}
			}
		}
		inp->in6p_laddr = sin6->sin6_addr;
	}
	socket_lock(so, 0);
	if (lport == 0) {
		int e;
		if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, p, 1)) != 0) {
			lck_rw_done(pcbinfo->mtx);
			return(e);
		}
	}
	else {
		inp->inp_lport = lport;
		if (in_pcbinshash(inp, 1) != 0) {
			inp->in6p_laddr = in6addr_any;
			inp->inp_lport = 0;
			lck_rw_done(pcbinfo->mtx);
			return (EAGAIN);
		}
	}	
	lck_rw_done(pcbinfo->mtx);
	sflt_notify(so, sock_evt_bound, NULL);
	return(0);
}
Exemplo n.º 2
0
/*
 * NOTE: in6_ifdetach() does not support loopback if at this moment.
 * We don't need this function in bsdi, because interfaces are never removed
 * from the ifnet list in bsdi.
 */
void
in6_ifdetach(struct ifnet *ifp)
{
	struct in6_ifaddr *ia, *oia;
	struct ifaddr *ifa, *next;
	struct rtentry *rt;
	short rtflags;
	struct in6_multi_mship *imm;

	/* remove ip6_mrouter stuff */
	ip6_mrouter_detach(ifp);

	/* remove neighbor management table */
	nd6_purge(ifp);

	/* XXX this code is duplicated in in6_purgeif() --dyoung */
	/* nuke any of IPv6 addresses we have */
	if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr);

	/* XXX isn't this code is redundant, given the above? --dyoung */
	/* XXX doesn't this code replicate code in in6_purgeaddr() ? --dyoung */
	/* undo everything done by in6_ifattach(), just in case */
	for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = next) {
		next = IFADDR_NEXT(ifa);

		if (ifa->ifa_addr->sa_family != AF_INET6
		 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
			continue;
		}

		ia = (struct in6_ifaddr *)ifa;

		/*
		 * leave from multicast groups we have joined for the interface
		 */
		while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
			LIST_REMOVE(imm, i6mm_chain);
			in6_leavegroup(imm);
		}

		/* remove from the routing table */
		if ((ia->ia_flags & IFA_ROUTE) &&
		    (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) {
			rtflags = rt->rt_flags;
			rtfree(rt);
			rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
			    (struct sockaddr *)&ia->ia_addr,
			    (struct sockaddr *)&ia->ia_prefixmask,
			    rtflags, NULL);
		}

		/* remove from the linked list */
		ifa_remove(ifp, &ia->ia_ifa);

		/* also remove from the IPv6 address chain(itojun&jinmei) */
		oia = ia;
		if (oia == (ia = in6_ifaddr))
			in6_ifaddr = ia->ia_next;
		else {
			while (ia->ia_next && (ia->ia_next != oia))
				ia = ia->ia_next;
			if (ia->ia_next)
				ia->ia_next = oia->ia_next;
			else {
				nd6log((LOG_ERR,
				    "%s: didn't unlink in6ifaddr from list\n",
				    if_name(ifp)));
			}
		}

		ifafree(&oia->ia_ifa);
	}

	/* cleanup multicast address kludge table, if there is any */
	in6_purgemkludge(ifp);

	/*
	 * remove neighbor management table.  we call it twice just to make
	 * sure we nuke everything.  maybe we need just one call.
	 * XXX: since the first call did not release addresses, some prefixes
	 * might remain.  We should call nd6_purge() again to release the
	 * prefixes after removing all addresses above.
	 * (Or can we just delay calling nd6_purge until at this point?)
	 */
	nd6_purge(ifp);
}