521 lines
14 KiB
C
521 lines
14 KiB
C
/* $NetBSD: in_pcb.c,v 1.22 1995/08/12 23:59:34 mycroft Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1991, 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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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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* 4. 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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* @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
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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/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/time.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 <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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struct in_addr zeroin_addr;
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void
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in_pcbinit(table)
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struct inpcbtable *table;
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{
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CIRCLEQ_INIT(&table->inpt_queue);
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table->inpt_lastport = 0;
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}
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int
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in_pcballoc(so, table)
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struct socket *so;
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struct inpcbtable *table;
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{
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register struct inpcb *inp;
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MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_WAITOK);
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if (inp == NULL)
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return (ENOBUFS);
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bzero((caddr_t)inp, sizeof(*inp));
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inp->inp_table = table;
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inp->inp_socket = so;
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CIRCLEQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue);
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so->so_pcb = (caddr_t)inp;
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return (0);
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}
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int
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in_pcbbind(inp, nam)
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register struct inpcb *inp;
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struct mbuf *nam;
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{
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register struct socket *so = inp->inp_socket;
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register struct inpcbtable *table = inp->inp_table;
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register struct sockaddr_in *sin;
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struct proc *p = curproc; /* XXX */
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u_int16_t lport = 0;
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int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
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int error;
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if (in_ifaddr.tqh_first == 0)
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return (EADDRNOTAVAIL);
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if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
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return (EINVAL);
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if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
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((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
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(so->so_options & SO_ACCEPTCONN) == 0))
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wild = INPLOOKUP_WILDCARD;
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if (nam) {
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sin = mtod(nam, struct sockaddr_in *);
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if (nam->m_len != sizeof (*sin))
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return (EINVAL);
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#ifdef notdef
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/*
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* We should check the family, but old programs
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* incorrectly fail to initialize it.
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*/
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if (sin->sin_family != AF_INET)
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return (EAFNOSUPPORT);
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#endif
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lport = sin->sin_port;
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if (IN_MULTICAST(sin->sin_addr.s_addr)) {
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/*
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* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
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* allow complete duplication of binding if
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* SO_REUSEPORT is set, or if SO_REUSEADDR is set
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* and a multicast address is bound on both
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* new and duplicated sockets.
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*/
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if (so->so_options & SO_REUSEADDR)
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reuseport = SO_REUSEADDR|SO_REUSEPORT;
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} else if (sin->sin_addr.s_addr != INADDR_ANY) {
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sin->sin_port = 0; /* yech... */
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if (ifa_ifwithaddr(sintosa(sin)) == 0)
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return (EADDRNOTAVAIL);
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}
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if (lport) {
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struct inpcb *t;
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/* GROSS */
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if (ntohs(lport) < IPPORT_RESERVED &&
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(error = suser(p->p_ucred, &p->p_acflag)))
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return (EACCES);
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t = in_pcblookup(table, zeroin_addr, 0,
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sin->sin_addr, lport, wild);
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if (t && (reuseport & t->inp_socket->so_options) == 0)
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return (EADDRINUSE);
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}
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inp->inp_laddr = sin->sin_addr;
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}
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if (lport == 0)
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do {
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if (table->inpt_lastport++ < IPPORT_RESERVED ||
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table->inpt_lastport > IPPORT_USERRESERVED)
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table->inpt_lastport = IPPORT_RESERVED;
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lport = htons(table->inpt_lastport);
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} while (in_pcblookup(table,
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zeroin_addr, 0, inp->inp_laddr, lport, wild));
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inp->inp_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 sin.
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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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in_pcbconnect(inp, nam)
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register struct inpcb *inp;
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struct mbuf *nam;
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{
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struct in_ifaddr *ia;
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struct sockaddr_in *ifaddr;
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register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
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if (nam->m_len != sizeof (*sin))
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return (EINVAL);
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if (sin->sin_family != AF_INET)
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return (EAFNOSUPPORT);
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if (sin->sin_port == 0)
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return (EADDRNOTAVAIL);
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if (in_ifaddr.tqh_first != 0) {
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/*
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* If the destination address is INADDR_ANY,
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* use the primary local address.
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* If the supplied address is INADDR_BROADCAST,
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* and the primary interface supports broadcast,
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* choose the broadcast address for that interface.
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*/
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if (sin->sin_addr.s_addr == INADDR_ANY)
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sin->sin_addr = in_ifaddr.tqh_first->ia_addr.sin_addr;
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else if (sin->sin_addr.s_addr == INADDR_BROADCAST &&
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(in_ifaddr.tqh_first->ia_ifp->if_flags & IFF_BROADCAST))
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sin->sin_addr = in_ifaddr.tqh_first->ia_broadaddr.sin_addr;
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}
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if (inp->inp_laddr.s_addr == INADDR_ANY) {
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register struct route *ro;
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ia = (struct in_ifaddr *)0;
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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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ro = &inp->inp_route;
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if (ro->ro_rt &&
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(satosin(&ro->ro_dst)->sin_addr.s_addr !=
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sin->sin_addr.s_addr ||
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inp->inp_socket->so_options & SO_DONTROUTE)) {
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RTFREE(ro->ro_rt);
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ro->ro_rt = (struct rtentry *)0;
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}
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if ((inp->inp_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_INET;
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ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
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satosin(&ro->ro_dst)->sin_addr = sin->sin_addr;
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rtalloc(ro);
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}
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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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* unless it is the loopback (in case a route
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* to our address on another net goes to loopback).
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*/
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if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
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ia = ifatoia(ro->ro_rt->rt_ifa);
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if (ia == 0) {
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u_int16_t fport = sin->sin_port;
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sin->sin_port = 0;
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ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
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if (ia == 0)
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ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
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sin->sin_port = fport;
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if (ia == 0)
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ia = in_ifaddr.tqh_first;
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if (ia == 0)
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return (EADDRNOTAVAIL);
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}
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/*
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* If the destination address is multicast and an outgoing
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* interface has been set as a multicast option, use the
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* address of that interface as our source address.
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*/
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if (IN_MULTICAST(sin->sin_addr.s_addr) &&
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inp->inp_moptions != NULL) {
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struct ip_moptions *imo;
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struct ifnet *ifp;
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imo = inp->inp_moptions;
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if (imo->imo_multicast_ifp != NULL) {
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ifp = imo->imo_multicast_ifp;
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for (ia = in_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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if (ia == 0)
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return (EADDRNOTAVAIL);
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}
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}
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ifaddr = satosin(&ia->ia_addr);
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}
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if (in_pcblookup(inp->inp_table,
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sin->sin_addr,
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sin->sin_port,
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inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
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inp->inp_lport,
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0))
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return (EADDRINUSE);
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if (inp->inp_laddr.s_addr == INADDR_ANY) {
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if (inp->inp_lport == 0)
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(void)in_pcbbind(inp, (struct mbuf *)0);
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inp->inp_laddr = ifaddr->sin_addr;
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}
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inp->inp_faddr = sin->sin_addr;
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inp->inp_fport = sin->sin_port;
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return (0);
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}
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int
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in_pcbdisconnect(inp)
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struct inpcb *inp;
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{
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inp->inp_faddr.s_addr = INADDR_ANY;
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inp->inp_fport = 0;
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if (inp->inp_socket->so_state & SS_NOFDREF)
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in_pcbdetach(inp);
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}
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int
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in_pcbdetach(inp)
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struct inpcb *inp;
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{
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struct socket *so = inp->inp_socket;
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so->so_pcb = 0;
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sofree(so);
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if (inp->inp_options)
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(void)m_free(inp->inp_options);
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if (inp->inp_route.ro_rt)
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rtfree(inp->inp_route.ro_rt);
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ip_freemoptions(inp->inp_moptions);
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CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue);
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FREE(inp, M_PCB);
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}
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int
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in_setsockaddr(inp, nam)
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register struct inpcb *inp;
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struct mbuf *nam;
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{
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register struct sockaddr_in *sin;
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nam->m_len = sizeof (*sin);
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sin = mtod(nam, struct sockaddr_in *);
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bzero((caddr_t)sin, sizeof (*sin));
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sin->sin_family = AF_INET;
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sin->sin_len = sizeof(*sin);
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sin->sin_port = inp->inp_lport;
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sin->sin_addr = inp->inp_laddr;
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}
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int
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in_setpeeraddr(inp, nam)
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struct inpcb *inp;
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struct mbuf *nam;
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{
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register struct sockaddr_in *sin;
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nam->m_len = sizeof (*sin);
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sin = mtod(nam, struct sockaddr_in *);
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bzero((caddr_t)sin, sizeof (*sin));
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sin->sin_family = AF_INET;
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sin->sin_len = sizeof(*sin);
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sin->sin_port = inp->inp_fport;
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sin->sin_addr = inp->inp_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. The local address and/or port numbers
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* may be specified to limit the search. The "usual action" will be
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* taken, depending on the ctlinput cmd. The caller must filter any
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* cmds that are uninteresting (e.g., no error in the map).
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* Call the protocol specific routine (if any) to report
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* any errors for each matching socket.
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*
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* Must be called at splsoftnet.
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*/
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void
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in_pcbnotify(table, dst, fport_arg, laddr, lport_arg, errno, notify)
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struct inpcbtable *table;
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struct sockaddr *dst;
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u_int fport_arg, lport_arg;
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struct in_addr laddr;
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int errno;
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void (*notify) __P((struct inpcb *, int));
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{
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register struct inpcb *inp, *oinp;
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struct in_addr faddr;
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u_int16_t fport = fport_arg, lport = lport_arg;
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if (dst->sa_family != AF_INET)
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return;
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faddr = satosin(dst)->sin_addr;
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if (faddr.s_addr == INADDR_ANY)
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return;
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for (inp = table->inpt_queue.cqh_first;
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inp != (struct inpcb *)&table->inpt_queue;) {
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if (inp->inp_faddr.s_addr != faddr.s_addr ||
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inp->inp_socket == 0 ||
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inp->inp_fport != fport ||
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inp->inp_lport != lport ||
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inp->inp_laddr.s_addr != laddr.s_addr) {
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inp = inp->inp_queue.cqe_next;
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continue;
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}
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oinp = inp;
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inp = inp->inp_queue.cqe_next;
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if (notify)
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(*notify)(oinp, errno);
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}
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}
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void
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in_pcbnotifyall(table, dst, errno, notify)
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struct inpcbtable *table;
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struct sockaddr *dst;
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int errno;
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void (*notify) __P((struct inpcb *, int));
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{
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register struct inpcb *inp, *oinp;
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struct in_addr faddr;
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if (dst->sa_family != AF_INET)
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return;
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faddr = satosin(dst)->sin_addr;
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if (faddr.s_addr == INADDR_ANY)
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return;
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for (inp = table->inpt_queue.cqh_first;
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inp != (struct inpcb *)&table->inpt_queue;) {
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if (inp->inp_faddr.s_addr != faddr.s_addr ||
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inp->inp_socket == 0) {
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inp = inp->inp_queue.cqe_next;
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continue;
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}
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oinp = inp;
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inp = inp->inp_queue.cqe_next;
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if (notify)
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(*notify)(oinp, errno);
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}
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}
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/*
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* Check for alternatives when higher level complains
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* about service problems. For now, invalidate cached
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* routing information. If the route was created dynamically
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* (by a redirect), time to try a default gateway again.
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*/
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int
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in_losing(inp)
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struct inpcb *inp;
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{
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register struct rtentry *rt;
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struct rt_addrinfo info;
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if ((rt = inp->inp_route.ro_rt)) {
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inp->inp_route.ro_rt = 0;
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bzero((caddr_t)&info, sizeof(info));
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info.rti_info[RTAX_DST] = &inp->inp_route.ro_dst;
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info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
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info.rti_info[RTAX_NETMASK] = rt_mask(rt);
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rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
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if (rt->rt_flags & RTF_DYNAMIC)
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(void) rtrequest(RTM_DELETE, rt_key(rt),
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rt->rt_gateway, rt_mask(rt), rt->rt_flags,
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(struct rtentry **)0);
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else
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/*
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* A new route can be allocated
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* the next time output is attempted.
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*/
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rtfree(rt);
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}
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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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in_rtchange(inp, errno)
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register struct inpcb *inp;
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int errno;
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{
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if (inp->inp_route.ro_rt) {
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rtfree(inp->inp_route.ro_rt);
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inp->inp_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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}
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struct inpcb *
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in_pcblookup(table, faddr, fport_arg, laddr, lport_arg, flags)
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struct inpcbtable *table;
|
|
struct in_addr faddr, laddr;
|
|
u_int fport_arg, lport_arg;
|
|
int flags;
|
|
{
|
|
register struct inpcb *inp, *match = 0;
|
|
int matchwild = 3, wildcard;
|
|
u_int16_t fport = fport_arg, lport = lport_arg;
|
|
|
|
for (inp = table->inpt_queue.cqh_first;
|
|
inp != (struct inpcb *)&table->inpt_queue;
|
|
inp = inp->inp_queue.cqe_next) {
|
|
if (inp->inp_lport != lport)
|
|
continue;
|
|
wildcard = 0;
|
|
if (inp->inp_laddr.s_addr != INADDR_ANY) {
|
|
if (laddr.s_addr == INADDR_ANY)
|
|
wildcard++;
|
|
else if (inp->inp_laddr.s_addr != laddr.s_addr)
|
|
continue;
|
|
} else {
|
|
if (laddr.s_addr != INADDR_ANY)
|
|
wildcard++;
|
|
}
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
if (faddr.s_addr == INADDR_ANY)
|
|
wildcard++;
|
|
else if (inp->inp_faddr.s_addr != faddr.s_addr ||
|
|
inp->inp_fport != fport)
|
|
continue;
|
|
} else {
|
|
if (faddr.s_addr != INADDR_ANY)
|
|
wildcard++;
|
|
}
|
|
if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
|
|
continue;
|
|
if (wildcard < matchwild) {
|
|
match = inp;
|
|
matchwild = wildcard;
|
|
if (matchwild == 0)
|
|
break;
|
|
}
|
|
}
|
|
return (match);
|
|
}
|