379 lines
9.5 KiB
C
379 lines
9.5 KiB
C
/* $NetBSD: ns_pcb.c,v 1.19 2003/08/07 16:33:46 agc Exp $ */
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/*
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* Copyright (c) 1984, 1985, 1986, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ns_pcb.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ns_pcb.c,v 1.19 2003/08/07 16:33:46 agc Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/errno.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 <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#include <netns/ns_pcb.h>
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#include <netns/ns_var.h>
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static const struct ns_addr zerons_addr;
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int
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ns_pcballoc(so, head)
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struct socket *so;
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struct nspcb *head;
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{
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struct nspcb *nsp;
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nsp = malloc(sizeof(*nsp), M_PCB, M_NOWAIT);
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if (nsp == 0)
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return (ENOBUFS);
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bzero((caddr_t)nsp, sizeof(*nsp));
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nsp->nsp_socket = so;
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insque(nsp, head);
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so->so_pcb = nsp;
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return (0);
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}
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int
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ns_pcbbind(nsp, nam, p)
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struct nspcb *nsp;
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struct mbuf *nam;
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struct proc *p;
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{
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struct sockaddr_ns *sns;
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u_int16_t lport = 0;
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if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr))
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return (EINVAL);
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if (nam == 0)
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goto noname;
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sns = mtod(nam, struct sockaddr_ns *);
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if (nam->m_len != sizeof (*sns))
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return (EINVAL);
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if (!ns_nullhost(sns->sns_addr)) {
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int tport = sns->sns_port;
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sns->sns_port = 0; /* yech... */
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if (ifa_ifwithaddr(snstosa(sns)) == 0)
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return (EADDRNOTAVAIL);
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sns->sns_port = tport;
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}
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lport = sns->sns_port;
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if (lport) {
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if (ntohs(lport) < NSPORT_RESERVED &&
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(p == 0 || suser(p->p_ucred, &p->p_acflag)))
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return (EACCES);
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if (ns_pcblookup(&zerons_addr, lport, 0))
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return (EADDRINUSE);
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}
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nsp->nsp_laddr = sns->sns_addr;
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noname:
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if (lport == 0)
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do {
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if (nspcb.nsp_lport++ < NSPORT_RESERVED)
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nspcb.nsp_lport = NSPORT_RESERVED;
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lport = htons(nspcb.nsp_lport);
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} while (ns_pcblookup(&zerons_addr, lport, 0));
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nsp->nsp_lport = lport;
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return (0);
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}
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/*
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* Connect from a socket to a specified address.
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* Both address and port must be specified in argument sns.
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* If don't have a local address for this socket yet,
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* then pick one.
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*/
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int
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ns_pcbconnect(nsp, nam)
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struct nspcb *nsp;
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struct mbuf *nam;
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{
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struct ns_ifaddr *ia;
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struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
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struct ns_addr *dst;
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struct route *ro;
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struct ifnet *ifp;
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if (nam->m_len != sizeof (*sns))
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return (EINVAL);
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if (sns->sns_family != AF_NS)
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return (EAFNOSUPPORT);
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if (sns->sns_port==0 || ns_nullhost(sns->sns_addr))
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return (EADDRNOTAVAIL);
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/*
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* If we haven't bound which network number to use as ours,
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* we will use the number of the outgoing interface.
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* This depends on having done a routing lookup, which
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* we will probably have to do anyway, so we might
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* as well do it now. On the other hand if we are
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* sending to multiple destinations we may have already
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* done the lookup, so see if we can use the route
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* from before. In any case, we only
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* chose a port number once, even if sending to multiple
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* destinations.
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*/
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ro = &nsp->nsp_route;
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dst = &satons_addr(ro->ro_dst);
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if (nsp->nsp_socket->so_options & SO_DONTROUTE)
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goto flush;
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if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr))
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goto flush;
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if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) {
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if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) {
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/* can patch route to avoid rtalloc */
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*dst = sns->sns_addr;
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} else {
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flush:
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if (ro->ro_rt)
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RTFREE(ro->ro_rt);
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ro->ro_rt = (struct rtentry *)0;
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nsp->nsp_laddr.x_net = ns_zeronet;
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}
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}/* else cached route is ok; do nothing */
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nsp->nsp_lastdst = sns->sns_addr;
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if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
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(ro->ro_rt == (struct rtentry *)0 ||
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ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
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/* No route yet, so try to acquire one */
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ro->ro_dst.sa_family = AF_NS;
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ro->ro_dst.sa_len = sizeof(ro->ro_dst);
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*dst = sns->sns_addr;
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dst->x_port = 0;
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rtalloc(ro);
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}
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if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) {
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/*
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* If route is known or can be allocated now,
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* our src addr is taken from the i/f, else punt.
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*/
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ia = 0;
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/*
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* If we found a route, use the address
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* corresponding to the outgoing interface
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*/
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if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
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for (ia = ns_ifaddr.tqh_first; ia != 0;
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ia = ia->ia_list.tqe_next) {
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if (ia->ia_ifp == ifp)
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break;
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}
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}
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if (ia == 0) {
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u_int16_t fport = sns->sns_addr.x_port;
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sns->sns_addr.x_port = 0;
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ia = (struct ns_ifaddr *)
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ifa_ifwithdstaddr(snstosa(sns));
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sns->sns_addr.x_port = fport;
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if (ia == 0)
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ia = ns_iaonnetof(&sns->sns_addr);
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if (ia == 0)
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ia = ns_ifaddr.tqh_first;
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if (ia == 0)
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return (EADDRNOTAVAIL);
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}
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nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net;
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}
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if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0))
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return (EADDRINUSE);
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if (ns_nullhost(nsp->nsp_laddr)) {
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if (nsp->nsp_lport == 0)
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(void) ns_pcbbind(nsp, (struct mbuf *)0,
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(struct proc *)0);
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nsp->nsp_laddr.x_host = ns_thishost;
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}
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nsp->nsp_faddr = sns->sns_addr;
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/* Includes nsp->nsp_fport = sns->sns_port; */
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return (0);
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}
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void
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ns_pcbdisconnect(nsp)
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struct nspcb *nsp;
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{
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nsp->nsp_faddr = zerons_addr;
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if (nsp->nsp_socket->so_state & SS_NOFDREF)
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ns_pcbdetach(nsp);
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}
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void
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ns_pcbdetach(nsp)
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struct nspcb *nsp;
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{
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struct socket *so = nsp->nsp_socket;
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so->so_pcb = 0;
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sofree(so);
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if (nsp->nsp_route.ro_rt)
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rtfree(nsp->nsp_route.ro_rt);
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remque(nsp);
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free(nsp, M_PCB);
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}
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void
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ns_setsockaddr(nsp, nam)
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struct nspcb *nsp;
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struct mbuf *nam;
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{
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struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
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nam->m_len = sizeof (*sns);
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sns = mtod(nam, struct sockaddr_ns *);
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bzero((caddr_t)sns, sizeof (*sns));
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sns->sns_len = sizeof(*sns);
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sns->sns_family = AF_NS;
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sns->sns_addr = nsp->nsp_laddr;
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}
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void
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ns_setpeeraddr(nsp, nam)
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struct nspcb *nsp;
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struct mbuf *nam;
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{
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struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
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nam->m_len = sizeof (*sns);
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sns = mtod(nam, struct sockaddr_ns *);
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bzero((caddr_t)sns, sizeof (*sns));
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sns->sns_len = sizeof(*sns);
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sns->sns_family = AF_NS;
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sns->sns_addr = nsp->nsp_faddr;
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}
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/*
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* Pass some notification to all connections of a protocol
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* associated with address dst. Call the
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* protocol specific routine to handle each connection.
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* Also pass an extra paramter via the nspcb. (which may in fact
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* be a parameter list!)
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*/
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void
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ns_pcbnotify(dst, errno, notify, param)
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struct ns_addr *dst;
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long param;
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int errno;
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void (*notify) __P((struct nspcb *));
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{
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struct nspcb *nsp, *oinp;
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int s = splnet();
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for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) {
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if (!ns_hosteq(*dst,nsp->nsp_faddr)) {
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next:
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nsp = nsp->nsp_next;
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continue;
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}
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if (nsp->nsp_socket == 0)
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goto next;
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if (errno)
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nsp->nsp_socket->so_error = errno;
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oinp = nsp;
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nsp = nsp->nsp_next;
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oinp->nsp_notify_param = param;
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(*notify)(oinp);
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}
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splx(s);
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}
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/*
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* After a routing change, flush old routing
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* and allocate a (hopefully) better one.
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*/
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void
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ns_rtchange(nsp)
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struct nspcb *nsp;
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{
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if (nsp->nsp_route.ro_rt) {
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rtfree(nsp->nsp_route.ro_rt);
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nsp->nsp_route.ro_rt = 0;
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/*
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* A new route can be allocated the next time
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* output is attempted.
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*/
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}
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/* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
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}
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struct nspcb *
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ns_pcblookup(faddr, lport, wildp)
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const struct ns_addr *faddr;
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u_int16_t lport;
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int wildp;
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{
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struct nspcb *nsp, *match = 0;
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int matchwild = 3, wildcard;
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u_int16_t fport;
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fport = faddr->x_port;
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for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) {
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if (nsp->nsp_lport != lport)
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continue;
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wildcard = 0;
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if (ns_nullhost(nsp->nsp_faddr)) {
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if (!ns_nullhost(*faddr))
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wildcard++;
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} else {
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if (ns_nullhost(*faddr))
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wildcard++;
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else {
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if (!ns_hosteq(nsp->nsp_faddr, *faddr))
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continue;
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if (nsp->nsp_fport != fport) {
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if (nsp->nsp_fport != 0)
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continue;
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else
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wildcard++;
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}
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}
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}
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if (wildcard && wildp==0)
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continue;
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if (wildcard < matchwild) {
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match = nsp;
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matchwild = wildcard;
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if (wildcard == 0)
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break;
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}
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}
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return (match);
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}
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