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freebsd-skq/sys/netipx/ipx_pcb.c
rwatson bba6f515e1 Use queue(9) instead of hand-crafted link lists for the global IPX 
address list (ipx_ifaddr -> ipx_ifaddrhead), and generally adopt the
naming and usage conventions found in netinet.

MFC after:	6 weeks
2009-06-24 20:57:50 +00:00

429 lines
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/*-
* Copyright (c) 1984, 1985, 1986, 1987, 1993
* The Regents of the University of California.
* Copyright (c) 2004-2009 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (c) 1995, Mike Mitchell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ipx_pcb.c
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <net/route.h>
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#include <netipx/ipx_pcb.h>
#include <netipx/ipx_var.h>
static struct ipx_addr zeroipx_addr;
static u_short ipxpcb_lport_cache;
int
ipx_pcballoc(struct socket *so, struct ipxpcbhead *head, struct thread *td)
{
struct ipxpcb *ipxp;
KASSERT(so->so_pcb == NULL, ("ipx_pcballoc: so_pcb != NULL"));
IPX_LIST_LOCK_ASSERT();
ipxp = malloc(sizeof *ipxp, M_PCB, M_NOWAIT | M_ZERO);
if (ipxp == NULL)
return (ENOBUFS);
IPX_LOCK_INIT(ipxp);
ipxp->ipxp_socket = so;
if (ipxcksum)
ipxp->ipxp_flags |= IPXP_CHECKSUM;
LIST_INSERT_HEAD(head, ipxp, ipxp_list);
so->so_pcb = (caddr_t)ipxp;
return (0);
}
int
ipx_pcbbind(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
{
struct sockaddr_ipx *sipx;
u_short lport = 0;
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
if (ipxp->ipxp_lport || !ipx_nullhost(ipxp->ipxp_laddr))
return (EINVAL);
if (nam == NULL)
goto noname;
sipx = (struct sockaddr_ipx *)nam;
if (!ipx_nullhost(sipx->sipx_addr)) {
int tport = sipx->sipx_port;
sipx->sipx_port = 0; /* yech... */
if (ifa_ifwithaddr_check((struct sockaddr *)sipx) == 0)
return (EADDRNOTAVAIL);
sipx->sipx_port = tport;
}
lport = sipx->sipx_port;
if (lport) {
u_short aport = ntohs(lport);
if (aport < IPXPORT_RESERVED && td != NULL &&
priv_check(td, PRIV_NETIPX_RESERVEDPORT))
return (EACCES);
if (ipx_pcblookup(&zeroipx_addr, lport, 0))
return (EADDRINUSE);
}
ipxp->ipxp_laddr = sipx->sipx_addr;
noname:
if (lport == 0)
do {
ipxpcb_lport_cache++;
if ((ipxpcb_lport_cache < IPXPORT_RESERVED) ||
(ipxpcb_lport_cache >= IPXPORT_WELLKNOWN))
ipxpcb_lport_cache = IPXPORT_RESERVED;
lport = htons(ipxpcb_lport_cache);
} while (ipx_pcblookup(&zeroipx_addr, lport, 0));
ipxp->ipxp_lport = lport;
return (0);
}
/*
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sipx.
* If don't have a local address for this socket yet,
* then pick one.
*/
int
ipx_pcbconnect(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
{
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)nam;
struct ipx_addr *dst;
struct route *ro;
struct ifnet *ifp;
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
if (sipx->sipx_family != AF_IPX)
return (EAFNOSUPPORT);
if (sipx->sipx_port == 0 || ipx_nullhost(sipx->sipx_addr))
return (EADDRNOTAVAIL);
/*
* If we haven't bound which network number to use as ours,
* we will use the number of the outgoing interface.
* This depends on having done a routing lookup, which
* we will probably have to do anyway, so we might
* as well do it now. On the other hand if we are
* sending to multiple destinations we may have already
* done the lookup, so see if we can use the route
* from before. In any case, we only
* chose a port number once, even if sending to multiple
* destinations.
*/
ro = &ipxp->ipxp_route;
dst = &satoipx_addr(ro->ro_dst);
if (ipxp->ipxp_socket->so_options & SO_DONTROUTE)
goto flush;
if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr))
goto flush;
if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) {
if (ro->ro_rt != NULL && !(ro->ro_rt->rt_flags & RTF_HOST)) {
/* can patch route to avoid rtalloc */
*dst = sipx->sipx_addr;
} else {
flush:
if (ro->ro_rt != NULL)
RTFREE(ro->ro_rt);
ro->ro_rt = NULL;
}
}/* else cached route is ok; do nothing */
ipxp->ipxp_lastdst = sipx->sipx_addr;
if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
(ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) {
/* No route yet, so try to acquire one */
ro->ro_dst.sa_family = AF_IPX;
ro->ro_dst.sa_len = sizeof(ro->ro_dst);
*dst = sipx->sipx_addr;
dst->x_port = 0;
rtalloc_ign(ro, 0);
}
if (ipx_neteqnn(ipxp->ipxp_laddr.x_net, ipx_zeronet)) {
struct ipx_ifaddr *ia = NULL;
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
*/
/*
* If we found a route, use the address
* corresponding to the outgoing interface
*/
if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL) {
IPX_IFADDR_RLOCK();
TAILQ_FOREACH(ia, &ipx_ifaddrhead, ia_link) {
if (ia->ia_ifp == ifp) {
ifa_ref(&ia->ia_ifa);
break;
}
}
IPX_IFADDR_RUNLOCK();
}
if (ia == NULL) {
u_short fport = sipx->sipx_addr.x_port;
sipx->sipx_addr.x_port = 0;
ia = (struct ipx_ifaddr *)
ifa_ifwithdstaddr((struct sockaddr *)sipx);
sipx->sipx_addr.x_port = fport;
if (ia == NULL) {
IPX_IFADDR_RLOCK();
ia = ipx_iaonnetof(&sipx->sipx_addr);
if (ia != NULL)
ifa_ref(&ia->ia_ifa);
IPX_IFADDR_RUNLOCK();
}
if (ia == NULL) {
IPX_IFADDR_RLOCK();
ia = TAILQ_FIRST(&ipx_ifaddrhead);
if (ia != NULL)
ifa_ref(&ia->ia_ifa);
IPX_IFADDR_RUNLOCK();
}
if (ia == NULL)
return (EADDRNOTAVAIL);
}
ipxp->ipxp_laddr.x_net = satoipx_addr(ia->ia_addr).x_net;
ifa_free(&ia->ia_ifa);
}
if (ipx_nullhost(ipxp->ipxp_laddr)) {
struct ipx_ifaddr *ia = NULL;
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
*/
/*
* If we found a route, use the address
* corresponding to the outgoing interface
*/
if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL) {
IPX_IFADDR_RLOCK();
TAILQ_FOREACH(ia, &ipx_ifaddrhead, ia_link) {
if (ia->ia_ifp == ifp) {
ifa_ref(&ia->ia_ifa);
break;
}
}
IPX_IFADDR_RUNLOCK();
}
if (ia == NULL) {
u_short fport = sipx->sipx_addr.x_port;
sipx->sipx_addr.x_port = 0;
ia = (struct ipx_ifaddr *)
ifa_ifwithdstaddr((struct sockaddr *)sipx);
sipx->sipx_addr.x_port = fport;
if (ia == NULL) {
IPX_IFADDR_RLOCK();
ia = ipx_iaonnetof(&sipx->sipx_addr);
if (ia != NULL)
ifa_ref(&ia->ia_ifa);
IPX_IFADDR_RUNLOCK();
}
if (ia == NULL) {
IPX_IFADDR_RLOCK();
ia = TAILQ_FIRST(&ipx_ifaddrhead);
if (ia != NULL)
ifa_ref(&ia->ia_ifa);
IPX_IFADDR_RUNLOCK();
}
if (ia == NULL)
return (EADDRNOTAVAIL);
}
ipxp->ipxp_laddr.x_host = satoipx_addr(ia->ia_addr).x_host;
ifa_free(&ia->ia_ifa);
}
if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0))
return (EADDRINUSE);
if (ipxp->ipxp_lport == 0)
ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
/* XXX just leave it zero if we can't find a route */
ipxp->ipxp_faddr = sipx->sipx_addr;
/* Includes ipxp->ipxp_fport = sipx->sipx_port; */
return (0);
}
void
ipx_pcbdisconnect(struct ipxpcb *ipxp)
{
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
ipxp->ipxp_faddr = zeroipx_addr;
}
void
ipx_pcbdetach(struct ipxpcb *ipxp)
{
struct socket *so = ipxp->ipxp_socket;
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
so->so_pcb = NULL;
ipxp->ipxp_socket = NULL;
}
void
ipx_pcbfree(struct ipxpcb *ipxp)
{
KASSERT(ipxp->ipxp_socket == NULL,
("ipx_pcbfree: ipxp_socket != NULL"));
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
if (ipxp->ipxp_route.ro_rt != NULL)
RTFREE(ipxp->ipxp_route.ro_rt);
LIST_REMOVE(ipxp, ipxp_list);
IPX_LOCK_DESTROY(ipxp);
free(ipxp, M_PCB);
}
void
ipx_getsockaddr(struct ipxpcb *ipxp, struct sockaddr **nam)
{
struct sockaddr_ipx *sipx, ssipx;
sipx = &ssipx;
bzero((caddr_t)sipx, sizeof(*sipx));
sipx->sipx_len = sizeof(*sipx);
sipx->sipx_family = AF_IPX;
IPX_LOCK(ipxp);
sipx->sipx_addr = ipxp->ipxp_laddr;
IPX_UNLOCK(ipxp);
*nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
}
void
ipx_getpeeraddr(struct ipxpcb *ipxp, struct sockaddr **nam)
{
struct sockaddr_ipx *sipx, ssipx;
sipx = &ssipx;
bzero(sipx, sizeof(*sipx));
sipx->sipx_len = sizeof(*sipx);
sipx->sipx_family = AF_IPX;
IPX_LOCK(ipxp);
sipx->sipx_addr = ipxp->ipxp_faddr;
IPX_UNLOCK(ipxp);
*nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
}
struct ipxpcb *
ipx_pcblookup(struct ipx_addr *faddr, u_short lport, int wildp)
{
struct ipxpcb *ipxp, *match = NULL;
int matchwild = 3, wildcard;
u_short fport;
IPX_LIST_LOCK_ASSERT();
fport = faddr->x_port;
LIST_FOREACH(ipxp, &ipxpcb_list, ipxp_list) {
if (ipxp->ipxp_lport != lport)
continue;
wildcard = 0;
if (ipx_nullhost(ipxp->ipxp_faddr)) {
if (!ipx_nullhost(*faddr))
wildcard++;
} else {
if (ipx_nullhost(*faddr))
wildcard++;
else {
if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr))
continue;
if (ipxp->ipxp_fport != fport) {
if (ipxp->ipxp_fport != 0)
continue;
else
wildcard++;
}
}
}
if (wildcard && wildp == 0)
continue;
if (wildcard < matchwild) {
match = ipxp;
matchwild = wildcard;
if (wildcard == 0)
break;
}
}
return (match);
}
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