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mirror of https://git.FreeBSD.org/src.git synced 2024-12-13 10:02:38 +00:00
freebsd/sys/netns/ns_pcb.c
2002-05-31 11:52:35 +00:00

365 lines
9.6 KiB
C

/*
* Copyright (c) 1984, 1985, 1986, 1987, 1993
* The Regents of the University of California. 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.
*
* @(#)ns_pcb.c 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <net/if.h>
#include <net/route.h>
#include <netns/ns.h>
#include <netns/ns_if.h>
#include <netns/ns_pcb.h>
struct ns_addr zerons_addr;
ns_pcballoc(so, head)
struct socket *so;
struct nspcb *head;
{
struct mbuf *m;
register struct nspcb *nsp;
m = m_getclr(M_DONTWAIT, MT_PCB);
if (m == NULL)
return (ENOBUFS);
nsp = mtod(m, struct nspcb *);
nsp->nsp_socket = so;
insque(nsp, head);
so->so_pcb = (caddr_t)nsp;
return (0);
}
ns_pcbbind(nsp, nam)
register struct nspcb *nsp;
struct mbuf *nam;
{
register struct sockaddr_ns *sns;
u_short lport = 0;
if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr))
return (EINVAL);
if (nam == 0)
goto noname;
sns = mtod(nam, struct sockaddr_ns *);
if (nam->m_len != sizeof (*sns))
return (EINVAL);
if (!ns_nullhost(sns->sns_addr)) {
int tport = sns->sns_port;
sns->sns_port = 0; /* yech... */
if (ifa_ifwithaddr((struct sockaddr *)sns) == 0)
return (EADDRNOTAVAIL);
sns->sns_port = tport;
}
lport = sns->sns_port;
if (lport) {
u_short aport = ntohs(lport);
if (aport < NSPORT_RESERVED &&
(nsp->nsp_socket->so_state & SS_PRIV) == 0)
return (EACCES);
if (ns_pcblookup(&zerons_addr, lport, 0))
return (EADDRINUSE);
}
nsp->nsp_laddr = sns->sns_addr;
noname:
if (lport == 0)
do {
if (nspcb.nsp_lport++ < NSPORT_RESERVED)
nspcb.nsp_lport = NSPORT_RESERVED;
lport = htons(nspcb.nsp_lport);
} while (ns_pcblookup(&zerons_addr, lport, 0));
nsp->nsp_lport = lport;
return (0);
}
/*
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sns.
* If don't have a local address for this socket yet,
* then pick one.
*/
ns_pcbconnect(nsp, nam)
struct nspcb *nsp;
struct mbuf *nam;
{
struct ns_ifaddr *ia;
register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
register struct ns_addr *dst;
register struct route *ro;
struct ifnet *ifp;
if (nam->m_len != sizeof (*sns))
return (EINVAL);
if (sns->sns_family != AF_NS)
return (EAFNOSUPPORT);
if (sns->sns_port==0 || ns_nullhost(sns->sns_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 = &nsp->nsp_route;
dst = &satons_addr(ro->ro_dst);
if (nsp->nsp_socket->so_options & SO_DONTROUTE)
goto flush;
if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr))
goto flush;
if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) {
if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) {
/* can patch route to avoid rtalloc */
*dst = sns->sns_addr;
} else {
flush:
if (ro->ro_rt)
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
nsp->nsp_laddr.x_net = ns_zeronet;
}
}/* else cached route is ok; do nothing */
nsp->nsp_lastdst = sns->sns_addr;
if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
(ro->ro_rt == (struct rtentry *)0 ||
ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
/* No route yet, so try to acquire one */
ro->ro_dst.sa_family = AF_NS;
ro->ro_dst.sa_len = sizeof(ro->ro_dst);
*dst = sns->sns_addr;
dst->x_port = 0;
rtalloc(ro);
}
if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) {
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
*/
ia = (struct ns_ifaddr *)0;
/*
* If we found a route, use the address
* corresponding to the outgoing interface
*/
if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp))
for (ia = ns_ifaddr; ia; ia = ia->ia_next)
if (ia->ia_ifp == ifp)
break;
if (ia == 0) {
u_short fport = sns->sns_addr.x_port;
sns->sns_addr.x_port = 0;
ia = (struct ns_ifaddr *)
ifa_ifwithdstaddr((struct sockaddr *)sns);
sns->sns_addr.x_port = fport;
if (ia == 0)
ia = ns_iaonnetof(&sns->sns_addr);
if (ia == 0)
ia = ns_ifaddr;
if (ia == 0)
return (EADDRNOTAVAIL);
}
nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net;
}
if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0))
return (EADDRINUSE);
if (ns_nullhost(nsp->nsp_laddr)) {
if (nsp->nsp_lport == 0)
(void) ns_pcbbind(nsp, (struct mbuf *)0);
nsp->nsp_laddr.x_host = ns_thishost;
}
nsp->nsp_faddr = sns->sns_addr;
/* Includes nsp->nsp_fport = sns->sns_port; */
return (0);
}
ns_pcbdisconnect(nsp)
struct nspcb *nsp;
{
nsp->nsp_faddr = zerons_addr;
if (nsp->nsp_socket->so_state & SS_NOFDREF)
ns_pcbdetach(nsp);
}
ns_pcbdetach(nsp)
struct nspcb *nsp;
{
struct socket *so = nsp->nsp_socket;
so->so_pcb = 0;
sotryfree(so);
if (nsp->nsp_route.ro_rt)
rtfree(nsp->nsp_route.ro_rt);
remque(nsp);
(void) m_free(dtom(nsp));
}
ns_setsockaddr(nsp, nam)
register struct nspcb *nsp;
struct mbuf *nam;
{
register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
nam->m_len = sizeof (*sns);
sns = mtod(nam, struct sockaddr_ns *);
bzero((caddr_t)sns, sizeof (*sns));
sns->sns_len = sizeof(*sns);
sns->sns_family = AF_NS;
sns->sns_addr = nsp->nsp_laddr;
}
ns_setpeeraddr(nsp, nam)
register struct nspcb *nsp;
struct mbuf *nam;
{
register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
nam->m_len = sizeof (*sns);
sns = mtod(nam, struct sockaddr_ns *);
bzero((caddr_t)sns, sizeof (*sns));
sns->sns_len = sizeof(*sns);
sns->sns_family = AF_NS;
sns->sns_addr = nsp->nsp_faddr;
}
/*
* Pass some notification to all connections of a protocol
* associated with address dst. Call the
* protocol specific routine to handle each connection.
* Also pass an extra paramter via the nspcb. (which may in fact
* be a parameter list!)
*/
ns_pcbnotify(dst, errno, notify, param)
register struct ns_addr *dst;
long param;
int errno, (*notify)();
{
register struct nspcb *nsp, *oinp;
int s = splimp();
for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) {
if (!ns_hosteq(*dst,nsp->nsp_faddr)) {
next:
nsp = nsp->nsp_next;
continue;
}
if (nsp->nsp_socket == 0)
goto next;
if (errno)
nsp->nsp_socket->so_error = errno;
oinp = nsp;
nsp = nsp->nsp_next;
oinp->nsp_notify_param = param;
(*notify)(oinp);
}
splx(s);
}
#ifdef notdef
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
ns_rtchange(nsp)
struct nspcb *nsp;
{
if (nsp->nsp_route.ro_rt) {
rtfree(nsp->nsp_route.ro_rt);
nsp->nsp_route.ro_rt = 0;
/*
* A new route can be allocated the next time
* output is attempted.
*/
}
/* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
}
#endif
struct nspcb *
ns_pcblookup(faddr, lport, wildp)
struct ns_addr *faddr;
u_short lport;
{
register struct nspcb *nsp, *match = 0;
int matchwild = 3, wildcard;
u_short fport;
fport = faddr->x_port;
for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) {
if (nsp->nsp_lport != lport)
continue;
wildcard = 0;
if (ns_nullhost(nsp->nsp_faddr)) {
if (!ns_nullhost(*faddr))
wildcard++;
} else {
if (ns_nullhost(*faddr))
wildcard++;
else {
if (!ns_hosteq(nsp->nsp_faddr, *faddr))
continue;
if (nsp->nsp_fport != fport) {
if (nsp->nsp_fport != 0)
continue;
else
wildcard++;
}
}
}
if (wildcard && wildp==0)
continue;
if (wildcard < matchwild) {
match = nsp;
matchwild = wildcard;
if (wildcard == 0)
break;
}
}
return (match);
}