883 lines
24 KiB
C
883 lines
24 KiB
C
/*
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* Copyright (c) 1982, 1986, 1991, 1993, 1995
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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 8.4 (Berkeley) 5/24/95
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* $Id: in_pcb.c,v 1.38 1998/01/27 09:15:03 davidg 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/proc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.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_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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static void in_pcbremlists __P((struct inpcb *));
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static void in_rtchange __P((struct inpcb *, int));
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/*
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* These configure the range of local port addresses assigned to
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* "unspecified" outgoing connections/packets/whatever.
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*/
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static int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */
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static int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */
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static int ipport_firstauto = IPPORT_RESERVED; /* 1024 */
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static int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */
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static int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 40000 */
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static int ipport_hilastauto = IPPORT_HILASTAUTO; /* 44999 */
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#define RANGECHK(var, min, max) \
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if ((var) < (min)) { (var) = (min); } \
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else if ((var) > (max)) { (var) = (max); }
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static int
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sysctl_net_ipport_check SYSCTL_HANDLER_ARGS
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{
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int error = sysctl_handle_int(oidp,
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oidp->oid_arg1, oidp->oid_arg2, req);
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if (!error) {
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RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
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RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
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RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
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RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
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RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
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RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
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}
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return error;
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}
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#undef RANGECHK
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SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
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SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
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&ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
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SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
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&ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
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SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
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&ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
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SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
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&ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
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SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
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&ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
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SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
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&ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
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/*
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* in_pcb.c: manage the Protocol Control Blocks.
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*
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* NOTE: It is assumed that most of these functions will be called at
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* splnet(). XXX - There are, unfortunately, a few exceptions to this
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* rule that should be fixed.
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*/
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/*
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* Allocate a PCB and associate it with the socket.
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*/
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int
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in_pcballoc(so, pcbinfo, p)
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struct socket *so;
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struct inpcbinfo *pcbinfo;
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struct proc *p;
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{
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register struct inpcb *inp;
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MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB,
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p ? M_WAITOK : M_NOWAIT);
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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_pcbinfo = pcbinfo;
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inp->inp_socket = so;
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LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
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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, p)
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register struct inpcb *inp;
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struct sockaddr *nam;
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struct proc *p;
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{
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register struct socket *so = inp->inp_socket;
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unsigned short *lastport;
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struct sockaddr_in *sin;
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struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
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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 (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
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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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wild = 1;
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if (nam) {
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sin = (struct sockaddr_in *)nam;
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if (nam->sa_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 && p &&
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suser(p->p_ucred, &p->p_acflag))
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return (EACCES);
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if (so->so_uid) {
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t = in_pcblookup_local(inp->inp_pcbinfo,
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sin->sin_addr, lport, INPLOOKUP_WILDCARD);
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if (t && (so->so_uid != t->inp_socket->so_uid))
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return (EADDRINUSE);
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}
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t = in_pcblookup_local(pcbinfo, sin->sin_addr,
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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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ushort first, last;
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int count;
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inp->inp_flags |= INP_ANONPORT;
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if (inp->inp_flags & INP_HIGHPORT) {
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first = ipport_hifirstauto; /* sysctl */
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last = ipport_hilastauto;
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lastport = &pcbinfo->lasthi;
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} else if (inp->inp_flags & INP_LOWPORT) {
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if (p && (error = suser(p->p_ucred, &p->p_acflag)))
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return error;
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first = ipport_lowfirstauto; /* 1023 */
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last = ipport_lowlastauto; /* 600 */
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lastport = &pcbinfo->lastlow;
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} else {
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first = ipport_firstauto; /* sysctl */
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last = ipport_lastauto;
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lastport = &pcbinfo->lastport;
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}
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/*
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* Simple check to ensure all ports are not used up causing
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* a deadlock here.
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*
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* We split the two cases (up and down) so that the direction
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* is not being tested on each round of the loop.
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*/
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if (first > last) {
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/*
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* counting down
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*/
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count = first - last;
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do {
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if (count-- < 0) { /* completely used? */
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/*
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* Undo any address bind that may have
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* occurred above.
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*/
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inp->inp_laddr.s_addr = INADDR_ANY;
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return (EAGAIN);
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}
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--*lastport;
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if (*lastport > first || *lastport < last)
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*lastport = first;
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lport = htons(*lastport);
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} while (in_pcblookup_local(pcbinfo,
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inp->inp_laddr, lport, wild));
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} else {
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/*
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* counting up
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*/
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count = last - first;
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do {
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if (count-- < 0) { /* completely used? */
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/*
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* Undo any address bind that may have
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* occurred above.
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*/
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inp->inp_laddr.s_addr = INADDR_ANY;
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return (EAGAIN);
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}
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++*lastport;
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if (*lastport < first || *lastport > last)
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*lastport = first;
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lport = htons(*lastport);
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} while (in_pcblookup_local(pcbinfo,
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inp->inp_laddr, lport, wild));
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}
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}
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inp->inp_lport = lport;
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if (in_pcbinshash(inp) != 0) {
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inp->inp_laddr.s_addr = INADDR_ANY;
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inp->inp_lport = 0;
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return (EAGAIN);
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}
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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 sockaddr *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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register struct sockaddr_in *sin = (struct sockaddr_in *)nam;
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if (nam->sa_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 (!TAILQ_EMPTY(&in_ifaddrhead)) {
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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_ifaddrhead.tqh_first)->sin_addr;
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else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
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(in_ifaddrhead.tqh_first->ia_ifp->if_flags & IFF_BROADCAST))
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sin->sin_addr = satosin(&in_ifaddrhead.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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((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_ifaddrhead.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(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_ifaddrhead.tqh_first; ia;
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ia = ia->ia_link.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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/*
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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, p)
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register struct inpcb *inp;
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struct sockaddr *nam;
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struct proc *p;
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{
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struct sockaddr_in *ifaddr;
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register struct sockaddr_in *sin = (struct sockaddr_in *)nam;
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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_hash(inp->inp_pcbinfo, sin->sin_addr, 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, 0) != NULL) {
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return (EADDRINUSE);
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}
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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 sockaddr *)0, p);
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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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in_pcbrehash(inp);
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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;
|
|
inp->inp_fport = 0;
|
|
in_pcbrehash(inp);
|
|
if (inp->inp_socket->so_state & SS_NOFDREF)
|
|
in_pcbdetach(inp);
|
|
}
|
|
|
|
void
|
|
in_pcbdetach(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
struct socket *so = inp->inp_socket;
|
|
|
|
in_pcbremlists(inp);
|
|
so->so_pcb = 0;
|
|
sofree(so);
|
|
if (inp->inp_options)
|
|
(void)m_free(inp->inp_options);
|
|
if (inp->inp_route.ro_rt)
|
|
rtfree(inp->inp_route.ro_rt);
|
|
ip_freemoptions(inp->inp_moptions);
|
|
FREE(inp, M_PCB);
|
|
}
|
|
|
|
/*
|
|
* The calling convention of in_setsockaddr() and in_setpeeraddr() was
|
|
* modified to match the pru_sockaddr() and pru_peeraddr() entry points
|
|
* in struct pr_usrreqs, so that protocols can just reference then directly
|
|
* without the need for a wrapper function. The socket must have a valid
|
|
* (i.e., non-nil) PCB, but it should be impossible to get an invalid one
|
|
* except through a kernel programming error, so it is acceptable to panic
|
|
* (or in this case trap) if the PCB is invalid. (Actually, we don't trap
|
|
* because there actually /is/ a programming error somewhere... XXX)
|
|
*/
|
|
int
|
|
in_setsockaddr(so, nam)
|
|
struct socket *so;
|
|
struct sockaddr **nam;
|
|
{
|
|
int s;
|
|
register struct inpcb *inp;
|
|
register struct sockaddr_in *sin;
|
|
|
|
/*
|
|
* Do the malloc first in case it blocks.
|
|
*/
|
|
MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, M_WAITOK);
|
|
bzero(sin, sizeof *sin);
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_len = sizeof(*sin);
|
|
|
|
s = splnet();
|
|
inp = sotoinpcb(so);
|
|
if (!inp) {
|
|
splx(s);
|
|
free(sin, M_SONAME);
|
|
return EINVAL;
|
|
}
|
|
sin->sin_port = inp->inp_lport;
|
|
sin->sin_addr = inp->inp_laddr;
|
|
splx(s);
|
|
|
|
*nam = (struct sockaddr *)sin;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
in_setpeeraddr(so, nam)
|
|
struct socket *so;
|
|
struct sockaddr **nam;
|
|
{
|
|
int s;
|
|
struct inpcb *inp;
|
|
register struct sockaddr_in *sin;
|
|
|
|
/*
|
|
* Do the malloc first in case it blocks.
|
|
*/
|
|
MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, M_WAITOK);
|
|
bzero((caddr_t)sin, sizeof (*sin));
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_len = sizeof(*sin);
|
|
|
|
s = splnet();
|
|
inp = sotoinpcb(so);
|
|
if (!inp) {
|
|
splx(s);
|
|
free(sin, M_SONAME);
|
|
return EINVAL;
|
|
}
|
|
sin->sin_port = inp->inp_fport;
|
|
sin->sin_addr = inp->inp_faddr;
|
|
splx(s);
|
|
|
|
*nam = (struct sockaddr *)sin;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pass some notification to all connections of a protocol
|
|
* associated with address dst. The local address and/or port numbers
|
|
* may be specified to limit the search. The "usual action" will be
|
|
* taken, depending on the ctlinput cmd. The caller must filter any
|
|
* cmds that are uninteresting (e.g., no error in the map).
|
|
* Call the protocol specific routine (if any) to report
|
|
* any errors for each matching socket.
|
|
*/
|
|
void
|
|
in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify)
|
|
struct inpcbhead *head;
|
|
struct sockaddr *dst;
|
|
u_int fport_arg, lport_arg;
|
|
struct in_addr laddr;
|
|
int cmd;
|
|
void (*notify) __P((struct inpcb *, int));
|
|
{
|
|
register struct inpcb *inp, *oinp;
|
|
struct in_addr faddr;
|
|
u_short fport = fport_arg, lport = lport_arg;
|
|
int errno, s;
|
|
|
|
if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)
|
|
return;
|
|
faddr = ((struct sockaddr_in *)dst)->sin_addr;
|
|
if (faddr.s_addr == INADDR_ANY)
|
|
return;
|
|
|
|
/*
|
|
* Redirects go to all references to the destination,
|
|
* and use in_rtchange to invalidate the route cache.
|
|
* Dead host indications: notify all references to the destination.
|
|
* Otherwise, if we have knowledge of the local port and address,
|
|
* deliver only to that socket.
|
|
*/
|
|
if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
|
|
fport = 0;
|
|
lport = 0;
|
|
laddr.s_addr = 0;
|
|
if (cmd != PRC_HOSTDEAD)
|
|
notify = in_rtchange;
|
|
}
|
|
errno = inetctlerrmap[cmd];
|
|
s = splnet();
|
|
for (inp = head->lh_first; inp != NULL;) {
|
|
if (inp->inp_faddr.s_addr != faddr.s_addr ||
|
|
inp->inp_socket == 0 ||
|
|
(lport && inp->inp_lport != lport) ||
|
|
(laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) ||
|
|
(fport && inp->inp_fport != fport)) {
|
|
inp = inp->inp_list.le_next;
|
|
continue;
|
|
}
|
|
oinp = inp;
|
|
inp = inp->inp_list.le_next;
|
|
if (notify)
|
|
(*notify)(oinp, errno);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Check for alternatives when higher level complains
|
|
* about service problems. For now, invalidate cached
|
|
* routing information. If the route was created dynamically
|
|
* (by a redirect), time to try a default gateway again.
|
|
*/
|
|
void
|
|
in_losing(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
register struct rtentry *rt;
|
|
struct rt_addrinfo info;
|
|
|
|
if ((rt = inp->inp_route.ro_rt)) {
|
|
inp->inp_route.ro_rt = 0;
|
|
bzero((caddr_t)&info, sizeof(info));
|
|
info.rti_info[RTAX_DST] =
|
|
(struct sockaddr *)&inp->inp_route.ro_dst;
|
|
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
|
|
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
|
|
rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
|
|
if (rt->rt_flags & RTF_DYNAMIC)
|
|
(void) rtrequest(RTM_DELETE, rt_key(rt),
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags,
|
|
(struct rtentry **)0);
|
|
else
|
|
/*
|
|
* A new route can be allocated
|
|
* the next time output is attempted.
|
|
*/
|
|
rtfree(rt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* After a routing change, flush old routing
|
|
* and allocate a (hopefully) better one.
|
|
*/
|
|
static 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.
|
|
*/
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lookup a PCB based on the local address and port.
|
|
*/
|
|
struct inpcb *
|
|
in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
|
|
struct inpcbinfo *pcbinfo;
|
|
struct in_addr laddr;
|
|
u_int lport_arg;
|
|
int wild_okay;
|
|
{
|
|
register struct inpcb *inp, *match = NULL;
|
|
int matchwild = 3, wildcard;
|
|
u_short lport = lport_arg;
|
|
|
|
if (!wild_okay) {
|
|
struct inpcbhead *head;
|
|
/*
|
|
* Look for an unconnected (wildcard foreign addr) PCB that
|
|
* matches the local address and port we're looking for.
|
|
*/
|
|
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
|
|
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY &&
|
|
inp->inp_laddr.s_addr == laddr.s_addr &&
|
|
inp->inp_lport == lport) {
|
|
/*
|
|
* Found.
|
|
*/
|
|
return (inp);
|
|
}
|
|
}
|
|
/*
|
|
* Not found.
|
|
*/
|
|
return (NULL);
|
|
} else {
|
|
struct inpcbporthead *porthash;
|
|
struct inpcbport *phd;
|
|
struct inpcb *match = NULL;
|
|
/*
|
|
* Best fit PCB lookup.
|
|
*
|
|
* First see if this local port is in use by looking on the
|
|
* port hash list.
|
|
*/
|
|
porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
|
|
pcbinfo->porthashmask)];
|
|
for (phd = porthash->lh_first; phd != NULL; phd = phd->phd_hash.le_next) {
|
|
if (phd->phd_port == lport)
|
|
break;
|
|
}
|
|
if (phd != NULL) {
|
|
/*
|
|
* Port is in use by one or more PCBs. Look for best
|
|
* fit.
|
|
*/
|
|
for (inp = phd->phd_pcblist.lh_first; inp != NULL;
|
|
inp = inp->inp_portlist.le_next) {
|
|
wildcard = 0;
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY)
|
|
wildcard++;
|
|
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 (wildcard < matchwild) {
|
|
match = inp;
|
|
matchwild = wildcard;
|
|
if (matchwild == 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return (match);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lookup PCB in hash list.
|
|
*/
|
|
struct inpcb *
|
|
in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard)
|
|
struct inpcbinfo *pcbinfo;
|
|
struct in_addr faddr, laddr;
|
|
u_int fport_arg, lport_arg;
|
|
int wildcard;
|
|
{
|
|
struct inpcbhead *head;
|
|
register struct inpcb *inp;
|
|
u_short fport = fport_arg, lport = lport_arg;
|
|
|
|
/*
|
|
* First look for an exact match.
|
|
*/
|
|
head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
|
|
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
|
|
if (inp->inp_faddr.s_addr == faddr.s_addr &&
|
|
inp->inp_laddr.s_addr == laddr.s_addr &&
|
|
inp->inp_fport == fport &&
|
|
inp->inp_lport == lport) {
|
|
/*
|
|
* Found.
|
|
*/
|
|
return (inp);
|
|
}
|
|
}
|
|
if (wildcard) {
|
|
struct inpcb *local_wild = NULL;
|
|
|
|
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
|
|
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY &&
|
|
inp->inp_lport == lport) {
|
|
if (inp->inp_laddr.s_addr == laddr.s_addr)
|
|
return (inp);
|
|
else if (inp->inp_laddr.s_addr == INADDR_ANY)
|
|
local_wild = inp;
|
|
}
|
|
}
|
|
return (local_wild);
|
|
}
|
|
|
|
/*
|
|
* Not found.
|
|
*/
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Insert PCB onto various hash lists.
|
|
*/
|
|
int
|
|
in_pcbinshash(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
struct inpcbhead *pcbhash;
|
|
struct inpcbporthead *pcbporthash;
|
|
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
|
|
struct inpcbport *phd;
|
|
|
|
pcbhash = &pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
|
|
inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
|
|
|
|
pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
|
|
pcbinfo->porthashmask)];
|
|
|
|
/*
|
|
* Go through port list and look for a head for this lport.
|
|
*/
|
|
for (phd = pcbporthash->lh_first; phd != NULL; phd = phd->phd_hash.le_next) {
|
|
if (phd->phd_port == inp->inp_lport)
|
|
break;
|
|
}
|
|
/*
|
|
* If none exists, malloc one and tack it on.
|
|
*/
|
|
if (phd == NULL) {
|
|
MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
|
|
if (phd == NULL) {
|
|
return (ENOBUFS); /* XXX */
|
|
}
|
|
phd->phd_port = inp->inp_lport;
|
|
LIST_INIT(&phd->phd_pcblist);
|
|
LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
|
|
}
|
|
inp->inp_phd = phd;
|
|
LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
|
|
LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Move PCB to the proper hash bucket when { faddr, fport } have been
|
|
* changed. NOTE: This does not handle the case of the lport changing (the
|
|
* hashed port list would have to be updated as well), so the lport must
|
|
* not change after in_pcbinshash() has been called.
|
|
*/
|
|
void
|
|
in_pcbrehash(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
struct inpcbhead *head;
|
|
|
|
head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
|
|
inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
|
|
|
|
LIST_REMOVE(inp, inp_hash);
|
|
LIST_INSERT_HEAD(head, inp, inp_hash);
|
|
}
|
|
|
|
/*
|
|
* Remove PCB from various lists.
|
|
*/
|
|
static void
|
|
in_pcbremlists(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
if (inp->inp_lport) {
|
|
struct inpcbport *phd = inp->inp_phd;
|
|
|
|
LIST_REMOVE(inp, inp_hash);
|
|
LIST_REMOVE(inp, inp_portlist);
|
|
if (phd->phd_pcblist.lh_first == NULL) {
|
|
LIST_REMOVE(phd, phd_hash);
|
|
free(phd, M_PCB);
|
|
}
|
|
}
|
|
LIST_REMOVE(inp, inp_list);
|
|
}
|