541 lines
15 KiB
C
541 lines
15 KiB
C
/*
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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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* $Id: in_pcb.c,v 1.5 1995/02/16 00:55:37 wollman Exp $
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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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int
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in_pcballoc(so, head)
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struct socket *so;
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struct inpcb *head;
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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_head = head;
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inp->inp_socket = so;
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insque(inp, head);
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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 inpcb *head = inp->inp_head;
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register struct sockaddr_in *sin;
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struct proc *p = curproc; /* XXX */
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u_short 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 == 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(ntohl(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((struct sockaddr *)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 (error);
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t = in_pcblookup(head, 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 (head->inp_lport++ < IPPORT_RESERVED ||
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head->inp_lport > IPPORT_USERRESERVED)
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head->inp_lport = IPPORT_RESERVED;
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lport = htons(head->inp_lport);
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} while (in_pcblookup(head,
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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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* Transform old in_pcbconnect() into an inner subroutine for new
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* in_pcbconnect(): Do some validity-checking on the remote
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* address (in mbuf 'nam') and then determine local host address
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* (i.e., which interface) to use to access that remote host.
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*
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* This preserves definition of in_pcbconnect(), while supporting a
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* slightly different version for T/TCP. (This is more than
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* a bit of a kludge, but cleaning up the internal interfaces would
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* have forced minor changes in every protocol).
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*/
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int
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in_pcbladdr(inp, nam, plocal_sin)
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register struct inpcb *inp;
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struct mbuf *nam;
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struct sockaddr_in **plocal_sin;
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{
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struct in_ifaddr *ia;
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struct sockaddr_in *ifaddr = 0;
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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) {
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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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#define satosin(sa) ((struct sockaddr_in *)(sa))
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#define sintosa(sin) ((struct sockaddr *)(sin))
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#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
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if (sin->sin_addr.s_addr == INADDR_ANY)
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sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;
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else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
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(in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))
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sin->sin_addr = satosin(&in_ifaddr->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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((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
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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_short 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;
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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(ntohl(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; ia; ia = ia->ia_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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/*
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* Don't do pcblookup call here; return interface in plocal_sin
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* and exit to caller, that will do the lookup.
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*/
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*plocal_sin = &ia->ia_addr;
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}
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return(0);
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}
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/*
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* Outer subroutine:
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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 sockaddr_in *ifaddr;
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register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
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int error;
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/*
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* Call inner routine, to assign local interface address.
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*/
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if (error = in_pcbladdr(inp, nam, &ifaddr))
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return(error);
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if (in_pcblookup(inp->inp_head,
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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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void
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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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void
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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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remque(inp);
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FREE(inp, M_PCB);
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}
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void
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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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void
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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 splnet.
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*/
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void
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in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify)
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struct inpcb *head;
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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 cmd;
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void (*notify) __P((struct inpcb *, int));
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{
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extern u_char inetctlerrmap[];
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register struct inpcb *inp, *oinp;
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struct in_addr faddr;
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u_short fport = fport_arg, lport = lport_arg;
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int errno;
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if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)
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return;
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faddr = ((struct sockaddr_in *)dst)->sin_addr;
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if (faddr.s_addr == INADDR_ANY)
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return;
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/*
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* Redirects go to all references to the destination,
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* and use in_rtchange to invalidate the route cache.
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* Dead host indications: notify all references to the destination.
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* Otherwise, if we have knowledge of the local port and address,
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* deliver only to that socket.
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*/
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if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
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fport = 0;
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lport = 0;
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laddr.s_addr = 0;
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if (cmd != PRC_HOSTDEAD)
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notify = in_rtchange;
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}
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errno = inetctlerrmap[cmd];
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for (inp = head->inp_next; inp != head;) {
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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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(lport && inp->inp_lport != lport) ||
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(laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) ||
|
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(fport && inp->inp_fport != fport)) {
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inp = inp->inp_next;
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continue;
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}
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oinp = inp;
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inp = inp->inp_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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/*
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|
* Check for alternatives when higher level complains
|
|
* 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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void
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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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|
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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] =
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(struct sockaddr *)&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)
|
|
(void) rtrequest(RTM_DELETE, rt_key(rt),
|
|
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
|
|
* the next time output is attempted.
|
|
*/
|
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rtfree(rt);
|
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}
|
|
}
|
|
|
|
/*
|
|
* After a routing change, flush old routing
|
|
* and allocate a (hopefully) better one.
|
|
*/
|
|
void
|
|
in_rtchange(inp, errno)
|
|
register struct inpcb *inp;
|
|
int errno;
|
|
{
|
|
if (inp->inp_route.ro_rt) {
|
|
rtfree(inp->inp_route.ro_rt);
|
|
inp->inp_route.ro_rt = 0;
|
|
/*
|
|
* A new route can be allocated the next time
|
|
* output is attempted.
|
|
*/
|
|
}
|
|
}
|
|
|
|
struct inpcb *
|
|
in_pcblookup(head, faddr, fport_arg, laddr, lport_arg, flags)
|
|
struct inpcb *head;
|
|
struct in_addr faddr, laddr;
|
|
u_int fport_arg, lport_arg;
|
|
int flags;
|
|
{
|
|
register struct inpcb *inp, *match = NULL;
|
|
int matchwild = 3, wildcard;
|
|
u_short fport = fport_arg, lport = lport_arg;
|
|
|
|
for (inp = head->inp_next; inp != head; inp = inp->inp_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) {
|
|
if (match->inp_prev != head) {
|
|
remque(match);
|
|
insque(match, head);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return (match);
|
|
}
|