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Diffstat (limited to 'c/src/lib/libnetworking/netinet/in_pcb.c')
-rw-r--r--c/src/lib/libnetworking/netinet/in_pcb.c757
1 files changed, 757 insertions, 0 deletions
diff --git a/c/src/lib/libnetworking/netinet/in_pcb.c b/c/src/lib/libnetworking/netinet/in_pcb.c
new file mode 100644
index 0000000000..5241ddb6f8
--- /dev/null
+++ b/c/src/lib/libnetworking/netinet/in_pcb.c
@@ -0,0 +1,757 @@
+/*
+ * Copyright (c) 1982, 1986, 1991, 1993, 1995
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
+ * $Id$
+ */
+
+#include <sys/param.h>
+#include <sys/queue.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/ioctl.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/in_pcb.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_var.h>
+
+struct in_addr zeroin_addr;
+
+static void in_pcbinshash __P((struct inpcb *));
+static void in_rtchange __P((struct inpcb *, int));
+
+/*
+ * These configure the range of local port addresses assigned to
+ * "unspecified" outgoing connections/packets/whatever.
+ */
+static int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */
+static int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */
+static int ipport_firstauto = IPPORT_RESERVED; /* 1024 */
+static int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */
+static int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 40000 */
+static int ipport_hilastauto = IPPORT_HILASTAUTO; /* 44999 */
+
+#define RANGECHK(var, min, max) \
+ if ((var) < (min)) { (var) = (min); } \
+ else if ((var) > (max)) { (var) = (max); }
+
+#if 0
+static int
+sysctl_net_ipport_check SYSCTL_HANDLER_ARGS
+{
+ int error = sysctl_handle_int(oidp,
+ oidp->oid_arg1, oidp->oid_arg2, req);
+ if (!error) {
+ RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
+ RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
+ RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
+ RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
+ RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
+ RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
+ }
+ return error;
+}
+#endif
+
+#undef RANGECHK
+
+SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
+
+SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
+ &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
+SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
+ &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
+SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
+ &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
+SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
+ &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
+SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
+ &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
+SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
+ &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
+
+int
+in_pcballoc(so, pcbinfo)
+ struct socket *so;
+ struct inpcbinfo *pcbinfo;
+{
+ register struct inpcb *inp;
+ int s;
+
+ MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_NOWAIT);
+ if (inp == NULL)
+ return (ENOBUFS);
+ bzero((caddr_t)inp, sizeof(*inp));
+ inp->inp_pcbinfo = pcbinfo;
+ inp->inp_socket = so;
+ s = splnet();
+ LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
+ in_pcbinshash(inp);
+ splx(s);
+ so->so_pcb = (caddr_t)inp;
+ return (0);
+}
+
+int
+in_pcbbind(inp, nam)
+ register struct inpcb *inp;
+ struct mbuf *nam;
+{
+ register struct socket *so = inp->inp_socket;
+ unsigned short *lastport;
+ struct sockaddr_in *sin;
+ u_short lport = 0;
+ int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
+ int error;
+
+ if (in_ifaddr == 0)
+ return (EADDRNOTAVAIL);
+ if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
+ return (EINVAL);
+ if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
+ ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
+ (so->so_options & SO_ACCEPTCONN) == 0))
+ wild = 1;
+ if (nam) {
+ sin = mtod(nam, struct sockaddr_in *);
+ if (nam->m_len != sizeof (*sin))
+ return (EINVAL);
+#ifdef notdef
+ /*
+ * We should check the family, but old programs
+ * incorrectly fail to initialize it.
+ */
+ if (sin->sin_family != AF_INET)
+ return (EAFNOSUPPORT);
+#endif
+ lport = sin->sin_port;
+ if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
+ /*
+ * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
+ * allow complete duplication of binding if
+ * SO_REUSEPORT is set, or if SO_REUSEADDR is set
+ * and a multicast address is bound on both
+ * new and duplicated sockets.
+ */
+ if (so->so_options & SO_REUSEADDR)
+ reuseport = SO_REUSEADDR|SO_REUSEPORT;
+ } else if (sin->sin_addr.s_addr != INADDR_ANY) {
+ sin->sin_port = 0; /* yech... */
+ if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
+ return (EADDRNOTAVAIL);
+ }
+ if (lport) {
+ struct inpcb *t;
+
+ /* GROSS */
+ if (ntohs(lport) < IPPORT_RESERVED &&
+ (error = suser(p->p_ucred, &p->p_acflag)))
+ return (EACCES);
+ if (so->so_uid) {
+ t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr,
+ 0, sin->sin_addr, lport,
+ INPLOOKUP_WILDCARD);
+ if (t && (so->so_uid != t->inp_socket->so_uid))
+ return (EADDRINUSE);
+ }
+ t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr, 0,
+ sin->sin_addr, lport, wild);
+ if (t && (reuseport & t->inp_socket->so_options) == 0)
+ return (EADDRINUSE);
+ }
+ inp->inp_laddr = sin->sin_addr;
+ }
+ if (lport == 0) {
+ ushort first, last;
+ int count;
+
+ inp->inp_flags |= INP_ANONPORT;
+
+ if (inp->inp_flags & INP_HIGHPORT) {
+ first = ipport_hifirstauto; /* sysctl */
+ last = ipport_hilastauto;
+ lastport = &inp->inp_pcbinfo->lasthi;
+ } else if (inp->inp_flags & INP_LOWPORT) {
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (EACCES);
+ first = ipport_lowfirstauto; /* 1023 */
+ last = ipport_lowlastauto; /* 600 */
+ lastport = &inp->inp_pcbinfo->lastlow;
+ } else {
+ first = ipport_firstauto; /* sysctl */
+ last = ipport_lastauto;
+ lastport = &inp->inp_pcbinfo->lastport;
+ }
+ /*
+ * Simple check to ensure all ports are not used up causing
+ * a deadlock here.
+ *
+ * We split the two cases (up and down) so that the direction
+ * is not being tested on each round of the loop.
+ */
+ if (first > last) {
+ /*
+ * counting down
+ */
+ count = first - last;
+
+ do {
+ if (count-- <= 0) /* completely used? */
+ return (EADDRNOTAVAIL);
+ --*lastport;
+ if (*lastport > first || *lastport < last)
+ *lastport = first;
+ lport = htons(*lastport);
+ } while (in_pcblookup(inp->inp_pcbinfo,
+ zeroin_addr, 0, inp->inp_laddr, lport, wild));
+ } else {
+ /*
+ * counting up
+ */
+ count = last - first;
+
+ do {
+ if (count-- <= 0) /* completely used? */
+ return (EADDRNOTAVAIL);
+ ++*lastport;
+ if (*lastport < first || *lastport > last)
+ *lastport = first;
+ lport = htons(*lastport);
+ } while (in_pcblookup(inp->inp_pcbinfo,
+ zeroin_addr, 0, inp->inp_laddr, lport, wild));
+ }
+ }
+ inp->inp_lport = lport;
+ in_pcbrehash(inp);
+ return (0);
+}
+
+/*
+ * Transform old in_pcbconnect() into an inner subroutine for new
+ * in_pcbconnect(): Do some validity-checking on the remote
+ * address (in mbuf 'nam') and then determine local host address
+ * (i.e., which interface) to use to access that remote host.
+ *
+ * This preserves definition of in_pcbconnect(), while supporting a
+ * slightly different version for T/TCP. (This is more than
+ * a bit of a kludge, but cleaning up the internal interfaces would
+ * have forced minor changes in every protocol).
+ */
+
+int
+in_pcbladdr(inp, nam, plocal_sin)
+ register struct inpcb *inp;
+ struct mbuf *nam;
+ struct sockaddr_in **plocal_sin;
+{
+ struct in_ifaddr *ia;
+ register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
+
+ if (nam->m_len != sizeof (*sin))
+ return (EINVAL);
+ if (sin->sin_family != AF_INET)
+ return (EAFNOSUPPORT);
+ if (sin->sin_port == 0)
+ return (EADDRNOTAVAIL);
+ if (in_ifaddr) {
+ /*
+ * If the destination address is INADDR_ANY,
+ * use the primary local address.
+ * If the supplied address is INADDR_BROADCAST,
+ * and the primary interface supports broadcast,
+ * choose the broadcast address for that interface.
+ */
+#define satosin(sa) ((struct sockaddr_in *)(sa))
+#define sintosa(sin) ((struct sockaddr *)(sin))
+#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
+ if (sin->sin_addr.s_addr == INADDR_ANY)
+ sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;
+ else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
+ (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))
+ sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr;
+ }
+ if (inp->inp_laddr.s_addr == INADDR_ANY) {
+ register struct route *ro;
+
+ ia = (struct in_ifaddr *)0;
+ /*
+ * If route is known or can be allocated now,
+ * our src addr is taken from the i/f, else punt.
+ */
+ ro = &inp->inp_route;
+ if (ro->ro_rt &&
+ (satosin(&ro->ro_dst)->sin_addr.s_addr !=
+ sin->sin_addr.s_addr ||
+ inp->inp_socket->so_options & SO_DONTROUTE)) {
+ RTFREE(ro->ro_rt);
+ ro->ro_rt = (struct rtentry *)0;
+ }
+ if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
+ (ro->ro_rt == (struct rtentry *)0 ||
+ ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
+ /* No route yet, so try to acquire one */
+ ro->ro_dst.sa_family = AF_INET;
+ ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
+ ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
+ sin->sin_addr;
+ rtalloc(ro);
+ }
+ /*
+ * If we found a route, use the address
+ * corresponding to the outgoing interface
+ * unless it is the loopback (in case a route
+ * to our address on another net goes to loopback).
+ */
+ if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
+ ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia == 0) {
+ u_short fport = sin->sin_port;
+
+ sin->sin_port = 0;
+ ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
+ if (ia == 0)
+ ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
+ sin->sin_port = fport;
+ if (ia == 0)
+ ia = in_ifaddr;
+ if (ia == 0)
+ return (EADDRNOTAVAIL);
+ }
+ /*
+ * If the destination address is multicast and an outgoing
+ * interface has been set as a multicast option, use the
+ * address of that interface as our source address.
+ */
+ if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
+ inp->inp_moptions != NULL) {
+ struct ip_moptions *imo;
+ struct ifnet *ifp;
+
+ imo = inp->inp_moptions;
+ if (imo->imo_multicast_ifp != NULL) {
+ ifp = imo->imo_multicast_ifp;
+ for (ia = in_ifaddr; ia; ia = ia->ia_next)
+ if (ia->ia_ifp == ifp)
+ break;
+ if (ia == 0)
+ return (EADDRNOTAVAIL);
+ }
+ }
+ /*
+ * Don't do pcblookup call here; return interface in plocal_sin
+ * and exit to caller, that will do the lookup.
+ */
+ *plocal_sin = &ia->ia_addr;
+
+ }
+ return(0);
+}
+
+/*
+ * Outer subroutine:
+ * Connect from a socket to a specified address.
+ * Both address and port must be specified in argument sin.
+ * If don't have a local address for this socket yet,
+ * then pick one.
+ */
+int
+in_pcbconnect(inp, nam)
+ register struct inpcb *inp;
+ struct mbuf *nam;
+{
+ struct sockaddr_in *ifaddr;
+ register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
+ int error;
+
+ /*
+ * Call inner routine, to assign local interface address.
+ */
+ if (error = in_pcbladdr(inp, nam, &ifaddr))
+ return(error);
+
+ if (in_pcblookuphash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,
+ inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
+ inp->inp_lport, 0) != NULL)
+ return (EADDRINUSE);
+ if (inp->inp_laddr.s_addr == INADDR_ANY) {
+ if (inp->inp_lport == 0)
+ (void)in_pcbbind(inp, (struct mbuf *)0);
+ inp->inp_laddr = ifaddr->sin_addr;
+ }
+ inp->inp_faddr = sin->sin_addr;
+ inp->inp_fport = sin->sin_port;
+ in_pcbrehash(inp);
+ return (0);
+}
+
+void
+in_pcbdisconnect(inp)
+ struct inpcb *inp;
+{
+
+ 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;
+ int s;
+
+ 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);
+ s = splnet();
+ LIST_REMOVE(inp, inp_hash);
+ LIST_REMOVE(inp, inp_list);
+ splx(s);
+ FREE(inp, M_PCB);
+}
+
+void
+in_setsockaddr(inp, nam)
+ register struct inpcb *inp;
+ struct mbuf *nam;
+{
+ register struct sockaddr_in *sin;
+
+ nam->m_len = sizeof (*sin);
+ sin = mtod(nam, struct sockaddr_in *);
+ bzero((caddr_t)sin, sizeof (*sin));
+ sin->sin_family = AF_INET;
+ sin->sin_len = sizeof(*sin);
+ sin->sin_port = inp->inp_lport;
+ sin->sin_addr = inp->inp_laddr;
+}
+
+void
+in_setpeeraddr(inp, nam)
+ struct inpcb *inp;
+ struct mbuf *nam;
+{
+ register struct sockaddr_in *sin;
+
+ nam->m_len = sizeof (*sin);
+ sin = mtod(nam, struct sockaddr_in *);
+ bzero((caddr_t)sin, sizeof (*sin));
+ sin->sin_family = AF_INET;
+ sin->sin_len = sizeof(*sin);
+ sin->sin_port = inp->inp_fport;
+ sin->sin_addr = inp->inp_faddr;
+}
+
+/*
+ * 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.
+ *
+ * Must be called at splnet.
+ */
+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 errnum, 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;
+ }
+ errnum = 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, errnum);
+ }
+ 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, errnum)
+ register struct inpcb *inp;
+ int errnum;
+{
+ 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(pcbinfo, faddr, fport_arg, laddr, lport_arg, wild_okay)
+ struct inpcbinfo *pcbinfo;
+ struct in_addr faddr, laddr;
+ u_int fport_arg, lport_arg;
+ int wild_okay;
+{
+ register struct inpcb *inp, *match = NULL;
+ int matchwild = 3, wildcard;
+ u_short fport = fport_arg, lport = lport_arg;
+ int s;
+
+ s = splnet();
+
+ for (inp = pcbinfo->listhead->lh_first; inp != NULL; inp = inp->inp_list.le_next) {
+ if (inp->inp_lport != lport)
+ continue;
+ wildcard = 0;
+ 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 (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 && wild_okay == 0)
+ continue;
+ if (wildcard < matchwild) {
+ match = inp;
+ matchwild = wildcard;
+ if (matchwild == 0) {
+ break;
+ }
+ }
+ }
+ splx(s);
+ return (match);
+}
+
+/*
+ * Lookup PCB in hash list.
+ */
+struct inpcb *
+in_pcblookuphash(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;
+ int s;
+
+ s = splnet();
+ /*
+ * 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)
+ goto found;
+ }
+ 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_fport == 0 && inp->inp_lport == lport) {
+ if (inp->inp_laddr.s_addr == laddr.s_addr)
+ goto found;
+ else if (inp->inp_laddr.s_addr == INADDR_ANY)
+ local_wild = inp;
+ }
+ }
+ if (local_wild != NULL) {
+ inp = local_wild;
+ goto found;
+ }
+ }
+ splx(s);
+ return (NULL);
+
+found:
+ /*
+ * Move PCB to head of this hash chain so that it can be
+ * found more quickly in the future.
+ * XXX - this is a pessimization on machines with few
+ * concurrent connections.
+ */
+ if (inp != head->lh_first) {
+ LIST_REMOVE(inp, inp_hash);
+ LIST_INSERT_HEAD(head, inp, inp_hash);
+ }
+ splx(s);
+ return (inp);
+}
+
+/*
+ * Insert PCB into hash chain. Must be called at splnet.
+ */
+static void
+in_pcbinshash(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_INSERT_HEAD(head, inp, inp_hash);
+}
+
+void
+in_pcbrehash(inp)
+ struct inpcb *inp;
+{
+ struct inpcbhead *head;
+ int s;
+
+ s = splnet();
+ LIST_REMOVE(inp, inp_hash);
+
+ head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
+ inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
+
+ LIST_INSERT_HEAD(head, inp, inp_hash);
+ splx(s);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 07:19:55 +0000