400 lines
9.9 KiB
C
400 lines
9.9 KiB
C
/*-
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* Copyright (c) 2004-2005 Robert N. M. Watson
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* Copyright (c) 1990,1994 Regents of The University of Michigan.
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* All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation, and that the name of The University
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* of Michigan not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. This software is supplied as is without expressed or
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* implied warranties of any kind.
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*
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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*
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* Research Systems Unix Group
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* The University of Michigan
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* c/o Wesley Craig
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* 535 W. William Street
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* Ann Arbor, Michigan
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* +1-313-764-2278
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* netatalk@umich.edu
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#include <netatalk/ddp_var.h>
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#include <netatalk/ddp_pcb.h>
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#include <netatalk/at_extern.h>
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struct mtx ddp_list_mtx;
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static struct ddpcb *ddp_ports[ ATPORT_LAST ];
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struct ddpcb *ddpcb_list = NULL;
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void
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at_sockaddr(struct ddpcb *ddp, struct sockaddr **addr)
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{
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/*
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* Prevent modification of ddp during copy of addr.
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*/
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DDP_LOCK_ASSERT(ddp);
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*addr = sodupsockaddr((struct sockaddr *)&ddp->ddp_lsat, M_NOWAIT);
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}
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int
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at_pcbsetaddr(struct ddpcb *ddp, struct sockaddr *addr, struct thread *td)
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{
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struct sockaddr_at lsat, *sat;
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struct at_ifaddr *aa;
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struct ddpcb *ddpp;
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/*
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* We read and write both the ddp passed in, and also ddp_ports.
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*/
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DDP_LIST_XLOCK_ASSERT();
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DDP_LOCK_ASSERT(ddp);
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if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) { /* shouldn't be bound */
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return (EINVAL);
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}
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if (addr != NULL) { /* validate passed address */
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sat = (struct sockaddr_at *)addr;
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if (sat->sat_family != AF_APPLETALK) {
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return (EAFNOSUPPORT);
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}
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if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
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sat->sat_addr.s_net != ATADDR_ANYNET) {
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for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
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if ((sat->sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) &&
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(sat->sat_addr.s_node == AA_SAT(aa)->sat_addr.s_node)) {
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break;
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}
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}
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if (!aa) {
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return (EADDRNOTAVAIL);
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}
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}
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if (sat->sat_port != ATADDR_ANYPORT) {
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if (sat->sat_port < ATPORT_FIRST ||
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sat->sat_port >= ATPORT_LAST) {
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return (EINVAL);
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}
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if (sat->sat_port < ATPORT_RESERVED &&
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suser(td)) {
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return (EACCES);
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}
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}
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} else {
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bzero((caddr_t)&lsat, sizeof(struct sockaddr_at));
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lsat.sat_len = sizeof(struct sockaddr_at);
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lsat.sat_addr.s_node = ATADDR_ANYNODE;
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lsat.sat_addr.s_net = ATADDR_ANYNET;
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lsat.sat_family = AF_APPLETALK;
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sat = &lsat;
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}
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if (sat->sat_addr.s_node == ATADDR_ANYNODE &&
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sat->sat_addr.s_net == ATADDR_ANYNET) {
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if (at_ifaddr_list == NULL) {
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return (EADDRNOTAVAIL);
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}
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sat->sat_addr = AA_SAT(at_ifaddr_list)->sat_addr;
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}
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ddp->ddp_lsat = *sat;
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/*
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* Choose port.
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*/
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if (sat->sat_port == ATADDR_ANYPORT) {
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for (sat->sat_port = ATPORT_RESERVED;
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sat->sat_port < ATPORT_LAST; sat->sat_port++) {
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if (ddp_ports[ sat->sat_port - 1 ] == NULL) {
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break;
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}
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}
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if (sat->sat_port == ATPORT_LAST) {
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return (EADDRNOTAVAIL);
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}
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ddp->ddp_lsat.sat_port = sat->sat_port;
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ddp_ports[ sat->sat_port - 1 ] = ddp;
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} else {
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for (ddpp = ddp_ports[ sat->sat_port - 1 ]; ddpp;
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ddpp = ddpp->ddp_pnext) {
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if (ddpp->ddp_lsat.sat_addr.s_net == sat->sat_addr.s_net &&
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ddpp->ddp_lsat.sat_addr.s_node == sat->sat_addr.s_node) {
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break;
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}
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}
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if (ddpp != NULL) {
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return (EADDRINUSE);
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}
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ddp->ddp_pnext = ddp_ports[ sat->sat_port - 1 ];
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ddp_ports[ sat->sat_port - 1 ] = ddp;
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if (ddp->ddp_pnext) {
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ddp->ddp_pnext->ddp_pprev = ddp;
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}
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}
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return (0);
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}
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int
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at_pcbconnect(struct ddpcb *ddp, struct sockaddr *addr, struct thread *td)
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{
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struct sockaddr_at *sat = (struct sockaddr_at *)addr;
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struct route *ro;
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struct at_ifaddr *aa = NULL;
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struct ifnet *ifp;
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u_short hintnet = 0, net;
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DDP_LIST_XLOCK_ASSERT();
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DDP_LOCK_ASSERT(ddp);
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if (sat->sat_family != AF_APPLETALK) {
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return (EAFNOSUPPORT);
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}
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/*
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* Under phase 2, network 0 means "the network". We take "the
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* network" to mean the network the control block is bound to.
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* If the control block is not bound, there is an error.
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*/
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if (sat->sat_addr.s_net == ATADDR_ANYNET
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&& sat->sat_addr.s_node != ATADDR_ANYNODE) {
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if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
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return (EADDRNOTAVAIL);
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}
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hintnet = ddp->ddp_lsat.sat_addr.s_net;
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}
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ro = &ddp->ddp_route;
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/*
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* If we've got an old route for this pcb, check that it is valid.
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* If we've changed our address, we may have an old "good looking"
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* route here. Attempt to detect it.
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*/
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if (ro->ro_rt) {
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if (hintnet) {
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net = hintnet;
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} else {
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net = sat->sat_addr.s_net;
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}
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aa = NULL;
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if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
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for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
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if (aa->aa_ifp == ifp &&
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ntohs(net) >= ntohs(aa->aa_firstnet) &&
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ntohs(net) <= ntohs(aa->aa_lastnet)) {
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break;
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}
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}
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}
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if (aa == NULL || (satosat(&ro->ro_dst)->sat_addr.s_net !=
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(hintnet ? hintnet : sat->sat_addr.s_net) ||
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satosat(&ro->ro_dst)->sat_addr.s_node !=
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sat->sat_addr.s_node)) {
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RTFREE(ro->ro_rt);
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ro->ro_rt = NULL;
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}
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}
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/*
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* If we've got no route for this interface, try to find one.
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*/
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if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
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ro->ro_dst.sa_len = sizeof(struct sockaddr_at);
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ro->ro_dst.sa_family = AF_APPLETALK;
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if (hintnet) {
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satosat(&ro->ro_dst)->sat_addr.s_net = hintnet;
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} else {
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satosat(&ro->ro_dst)->sat_addr.s_net = sat->sat_addr.s_net;
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}
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satosat(&ro->ro_dst)->sat_addr.s_node = sat->sat_addr.s_node;
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rtalloc(ro);
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}
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/*
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* Make sure any route that we have has a valid interface.
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*/
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aa = NULL;
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if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
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for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
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if (aa->aa_ifp == ifp) {
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break;
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}
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}
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}
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if (aa == NULL) {
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return (ENETUNREACH);
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}
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ddp->ddp_fsat = *sat;
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if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
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return (at_pcbsetaddr(ddp, NULL, td));
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}
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return (0);
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}
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void
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at_pcbdisconnect(struct ddpcb *ddp)
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{
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DDP_LOCK_ASSERT(ddp);
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ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
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ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
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ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
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}
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int
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at_pcballoc(struct socket *so)
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{
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struct ddpcb *ddp;
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DDP_LIST_XLOCK_ASSERT();
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MALLOC(ddp, struct ddpcb *, sizeof *ddp, M_PCB, M_NOWAIT | M_ZERO);
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if (ddp == NULL)
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return (ENOBUFS);
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DDP_LOCK_INIT(ddp);
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ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
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ddp->ddp_socket = so;
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so->so_pcb = (caddr_t)ddp;
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ddp->ddp_next = ddpcb_list;
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ddp->ddp_prev = NULL;
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ddp->ddp_pprev = NULL;
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ddp->ddp_pnext = NULL;
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if (ddpcb_list != NULL) {
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ddpcb_list->ddp_prev = ddp;
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}
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ddpcb_list = ddp;
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return(0);
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}
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void
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at_pcbdetach(struct socket *so, struct ddpcb *ddp)
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{
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/*
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* We modify ddp, ddp_ports, and the global list.
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*/
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DDP_LIST_XLOCK_ASSERT();
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DDP_LOCK_ASSERT(ddp);
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soisdisconnected(so);
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ACCEPT_LOCK();
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SOCK_LOCK(so);
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so->so_pcb = NULL;
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sotryfree(so);
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/* remove ddp from ddp_ports list */
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if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
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ddp_ports[ ddp->ddp_lsat.sat_port - 1 ] != NULL) {
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if (ddp->ddp_pprev != NULL) {
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ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
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} else {
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ddp_ports[ ddp->ddp_lsat.sat_port - 1 ] = ddp->ddp_pnext;
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}
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if (ddp->ddp_pnext != NULL) {
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ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
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}
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}
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if (ddp->ddp_route.ro_rt) {
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RTFREE(ddp->ddp_route.ro_rt);
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}
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if (ddp->ddp_prev) {
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ddp->ddp_prev->ddp_next = ddp->ddp_next;
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} else {
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ddpcb_list = ddp->ddp_next;
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}
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if (ddp->ddp_next) {
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ddp->ddp_next->ddp_prev = ddp->ddp_prev;
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}
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DDP_UNLOCK(ddp);
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DDP_LOCK_DESTROY(ddp);
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FREE(ddp, M_PCB);
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}
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/*
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* For the moment, this just find the pcb with the correct local address.
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* In the future, this will actually do some real searching, so we can use
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* the sender's address to do de-multiplexing on a single port to many
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* sockets (pcbs).
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*/
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struct ddpcb *
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ddp_search(struct sockaddr_at *from, struct sockaddr_at *to,
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struct at_ifaddr *aa)
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{
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struct ddpcb *ddp;
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DDP_LIST_SLOCK_ASSERT();
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/*
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* Check for bad ports.
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*/
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if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) {
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return (NULL);
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}
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/*
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* Make sure the local address matches the sent address. What about
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* the interface?
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*/
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for (ddp = ddp_ports[ to->sat_port - 1 ]; ddp; ddp = ddp->ddp_pnext) {
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DDP_LOCK(ddp);
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/* XXX should we handle 0.YY? */
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/* XXXX.YY to socket on destination interface */
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if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
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to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) {
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DDP_UNLOCK(ddp);
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break;
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}
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/* 0.255 to socket on receiving interface */
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if (to->sat_addr.s_node == ATADDR_BCAST && (to->sat_addr.s_net == 0 ||
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to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) &&
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ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) {
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DDP_UNLOCK(ddp);
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break;
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}
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/* XXXX.0 to socket on destination interface */
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if (to->sat_addr.s_net == aa->aa_firstnet &&
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to->sat_addr.s_node == 0 &&
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ntohs(ddp->ddp_lsat.sat_addr.s_net) >=
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ntohs(aa->aa_firstnet) &&
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ntohs(ddp->ddp_lsat.sat_addr.s_net) <=
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ntohs(aa->aa_lastnet)) {
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DDP_UNLOCK(ddp);
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break;
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}
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DDP_UNLOCK(ddp);
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}
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return (ddp);
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}
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