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NetBSD/sys/netinet/in_pcb.c

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/* $NetBSD: in_pcb.c,v 1.188 2022/06/10 09:51:10 knakahara Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
*/
/*-
* Copyright (c) 1998, 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Coyote Point Systems, Inc.
* This code is derived from software contributed to The NetBSD Foundation
* by Public Access Networks Corporation ("Panix"). It was developed under
* contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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. 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
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.188 2022/06/10 09:51:10 knakahara Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_ipsec.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/once.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/uidinfo.h>
#include <sys/domain.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>
#include <netinet/portalgo.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#endif
#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/key.h>
#endif /* IPSEC */
#include <netinet/tcp_vtw.h>
struct in_addr zeroin_addr;
#define INPCBHASH_PORT(table, lport) \
&(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash]
#define INPCBHASH_BIND(table, laddr, lport) \
&(table)->inpt_bindhashtbl[ \
((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash]
#define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \
&(table)->inpt_connecthashtbl[ \
((ntohl((faddr).s_addr) + ntohs(fport)) + \
(ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash]
int anonportmin = IPPORT_ANONMIN;
int anonportmax = IPPORT_ANONMAX;
int lowportmin = IPPORT_RESERVEDMIN;
int lowportmax = IPPORT_RESERVEDMAX;
static struct pool inpcb_pool;
static int
inpcb_poolinit(void)
{
pool_init(&inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL,
IPL_NET);
return 0;
}
void
in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize)
{
static ONCE_DECL(control);
TAILQ_INIT(&table->inpt_queue);
table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, true,
&table->inpt_porthash);
table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, true,
&table->inpt_bindhash);
table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, true,
&table->inpt_connecthash);
table->inpt_lastlow = IPPORT_RESERVEDMAX;
table->inpt_lastport = (u_int16_t)anonportmax;
RUN_ONCE(&control, inpcb_poolinit);
}
int
in_pcballoc(struct socket *so, void *v)
{
struct inpcbtable *table = v;
struct inpcb *inp;
int s;
KASSERT(so->so_proto->pr_domain->dom_family == AF_INET);
inp = pool_get(&inpcb_pool, PR_NOWAIT);
if (inp == NULL)
return (ENOBUFS);
memset(inp, 0, sizeof(*inp));
inp->inp_af = AF_INET;
inp->inp_table = table;
inp->inp_socket = so;
inp->inp_errormtu = -1;
inp->inp_portalgo = PORTALGO_DEFAULT;
inp->inp_bindportonsend = false;
inp->inp_prefsrcip.s_addr = INADDR_ANY;
inp->inp_overudp_cb = NULL;
inp->inp_overudp_arg = NULL;
#if defined(IPSEC)
if (ipsec_enabled) {
int error = ipsec_init_pcbpolicy(so, &inp->inp_sp);
if (error != 0) {
pool_put(&inpcb_pool, inp);
return error;
}
inp->inp_sp->sp_inph = (struct inpcb_hdr *)inp;
}
#endif
so->so_pcb = inp;
s = splsoftnet();
TAILQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head, inph_queue);
LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head,
inph_lhash);
in_pcbstate(inp, INP_ATTACHED);
splx(s);
return (0);
}
static int
in_pcbsetport(struct sockaddr_in *sin, struct inpcb *inp, kauth_cred_t cred)
{
struct inpcbtable *table = inp->inp_table;
struct socket *so = inp->inp_socket;
u_int16_t *lastport;
u_int16_t lport = 0;
enum kauth_network_req req;
int error;
if (inp->inp_flags & INP_LOWPORT) {
#ifndef IPNOPRIVPORTS
req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
#else
req = KAUTH_REQ_NETWORK_BIND_PORT;
#endif
lastport = &table->inpt_lastlow;
} else {
req = KAUTH_REQ_NETWORK_BIND_PORT;
lastport = &table->inpt_lastport;
}
/* XXX-kauth: KAUTH_REQ_NETWORK_BIND_AUTOASSIGN_{,PRIV}PORT */
error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, so, sin,
NULL);
if (error)
return (EACCES);
/*
* Use RFC6056 randomized port selection
*/
error = portalgo_randport(&lport, &inp->inp_head, cred);
if (error)
return error;
inp->inp_flags |= INP_ANONPORT;
*lastport = lport;
lport = htons(lport);
inp->inp_lport = lport;
in_pcbstate(inp, INP_BOUND);
return (0);
}
int
in_pcbbindableaddr(const struct inpcb *inp, struct sockaddr_in *sin,
kauth_cred_t cred)
{
int error = EADDRNOTAVAIL;
struct ifaddr *ifa = NULL;
int s;
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
s = pserialize_read_enter();
if (IN_MULTICAST(sin->sin_addr.s_addr)) {
/* Always succeed; port reuse handled in in_pcbbind_port(). */
} else if (!in_nullhost(sin->sin_addr)) {
struct in_ifaddr *ia;
ia = in_get_ia(sin->sin_addr);
/* check for broadcast addresses */
if (ia == NULL) {
ifa = ifa_ifwithaddr(sintosa(sin));
if (ifa != NULL)
ia = ifatoia(ifa);
else if ((inp->inp_flags & INP_BINDANY) != 0) {
error = 0;
goto error;
}
}
if (ia == NULL)
goto error;
if (ia->ia4_flags & IN_IFF_DUPLICATED)
goto error;
}
error = 0;
error:
pserialize_read_exit(s);
return error;
}
static int
in_pcbbind_addr(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
{
int error;
error = in_pcbbindableaddr(inp, sin, cred);
if (error == 0)
inp->inp_laddr = sin->sin_addr;
return error;
}
static int
in_pcbbind_port(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
{
struct inpcbtable *table = inp->inp_table;
struct socket *so = inp->inp_socket;
int reuseport = (so->so_options & SO_REUSEPORT);
int wild = 0, error;
if (IN_MULTICAST(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 | SO_REUSEPORT))
reuseport = SO_REUSEADDR|SO_REUSEPORT;
}
if (sin->sin_port == 0) {
error = in_pcbsetport(sin, inp, cred);
if (error)
return (error);
} else {
struct inpcb *t;
vestigial_inpcb_t vestige;
#ifdef INET6
struct in6pcb *t6;
struct in6_addr mapped;
#endif
enum kauth_network_req req;
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
wild = 1;
#ifndef IPNOPRIVPORTS
if (ntohs(sin->sin_port) < IPPORT_RESERVED)
req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
else
#endif /* !IPNOPRIVPORTS */
req = KAUTH_REQ_NETWORK_BIND_PORT;
error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req,
so, sin, NULL);
if (error)
return (EACCES);
#ifdef INET6
in6_in_2_v4mapin6(&sin->sin_addr, &mapped);
t6 = in6_pcblookup_port(table, &mapped, sin->sin_port, wild, &vestige);
if (t6 && (reuseport & t6->in6p_socket->so_options) == 0)
return (EADDRINUSE);
if (!t6 && vestige.valid) {
if (!!reuseport != !!vestige.reuse_port) {
return EADDRINUSE;
}
}
#endif
/* XXX-kauth */
if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) {
t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, 1, &vestige);
/*
* XXX: investigate ramifications of loosening this
* restriction so that as long as both ports have
* SO_REUSEPORT allow the bind
*/
if (t &&
(!in_nullhost(sin->sin_addr) ||
!in_nullhost(t->inp_laddr) ||
(t->inp_socket->so_options & SO_REUSEPORT) == 0)
&& (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) {
return (EADDRINUSE);
}
if (!t && vestige.valid) {
if ((!in_nullhost(sin->sin_addr)
|| !in_nullhost(vestige.laddr.v4)
|| !vestige.reuse_port)
&& so->so_uidinfo->ui_uid != vestige.uid) {
return EADDRINUSE;
}
}
}
t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, wild, &vestige);
if (t && (reuseport & t->inp_socket->so_options) == 0)
return (EADDRINUSE);
if (!t
&& vestige.valid
&& !(reuseport && vestige.reuse_port))
return EADDRINUSE;
inp->inp_lport = sin->sin_port;
in_pcbstate(inp, INP_BOUND);
}
LIST_REMOVE(&inp->inp_head, inph_lhash);
LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head,
inph_lhash);
return (0);
}
int
in_pcbbind(void *v, struct sockaddr_in *sin, struct lwp *l)
{
struct inpcb *inp = v;
struct sockaddr_in lsin;
int error;
if (inp->inp_af != AF_INET)
return (EINVAL);
if (inp->inp_lport || !in_nullhost(inp->inp_laddr))
return (EINVAL);
if (NULL != sin) {
if (sin->sin_len != sizeof(*sin))
return (EINVAL);
} else {
lsin = *((const struct sockaddr_in *)
inp->inp_socket->so_proto->pr_domain->dom_sa_any);
sin = &lsin;
}
/* Bind address. */
error = in_pcbbind_addr(inp, sin, l->l_cred);
if (error)
return (error);
/* Bind port. */
error = in_pcbbind_port(inp, sin, l->l_cred);
if (error) {
inp->inp_laddr.s_addr = INADDR_ANY;
return (error);
}
return (0);
}
/*
* 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(void *v, struct sockaddr_in *sin, struct lwp *l)
{
struct inpcb *inp = v;
vestigial_inpcb_t vestige;
int error;
struct in_addr laddr;
if (inp->inp_af != AF_INET)
return (EINVAL);
if (sin->sin_len != sizeof (*sin))
return (EINVAL);
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
if (sin->sin_port == 0)
return (EADDRNOTAVAIL);
if (IN_MULTICAST(sin->sin_addr.s_addr) &&
inp->inp_socket->so_type == SOCK_STREAM)
return EADDRNOTAVAIL;
if (!IN_ADDRLIST_READER_EMPTY()) {
/*
* If the destination address is INADDR_ANY,
* use any local address (likely loopback).
* If the supplied address is INADDR_BROADCAST,
* use the broadcast address of an interface
* which supports broadcast. (loopback does not)
*/
if (in_nullhost(sin->sin_addr)) {
/* XXX racy */
sin->sin_addr =
IN_ADDRLIST_READER_FIRST()->ia_addr.sin_addr;
} else if (sin->sin_addr.s_addr == INADDR_BROADCAST) {
struct in_ifaddr *ia;
int s = pserialize_read_enter();
IN_ADDRLIST_READER_FOREACH(ia) {
if (ia->ia_ifp->if_flags & IFF_BROADCAST) {
sin->sin_addr =
ia->ia_broadaddr.sin_addr;
break;
}
}
pserialize_read_exit(s);
}
}
/*
* If we haven't bound which network number to use as ours,
* we will use the number of the outgoing interface.
* This depends on having done a routing lookup, which
* we will probably have to do anyway, so we might
* as well do it now. On the other hand if we are
* sending to multiple destinations we may have already
* done the lookup, so see if we can use the route
* from before. In any case, we only
* chose a port number once, even if sending to multiple
* destinations.
*/
if (in_nullhost(inp->inp_laddr)) {
int xerror;
struct in_ifaddr *ia, *_ia;
int s;
struct psref psref;
int bound;
bound = curlwp_bind();
ia = in_selectsrc(sin, &inp->inp_route,
inp->inp_socket->so_options, inp->inp_moptions, &xerror,
&psref);
if (ia == NULL) {
curlwp_bindx(bound);
if (xerror == 0)
xerror = EADDRNOTAVAIL;
return xerror;
}
s = pserialize_read_enter();
_ia = in_get_ia(IA_SIN(ia)->sin_addr);
if (_ia == NULL && (inp->inp_flags & INP_BINDANY) == 0) {
pserialize_read_exit(s);
ia4_release(ia, &psref);
curlwp_bindx(bound);
return (EADDRNOTAVAIL);
}
pserialize_read_exit(s);
laddr = IA_SIN(ia)->sin_addr;
ia4_release(ia, &psref);
curlwp_bindx(bound);
} else
laddr = inp->inp_laddr;
if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port,
laddr, inp->inp_lport, &vestige) != NULL ||
vestige.valid) {
return (EADDRINUSE);
}
if (in_nullhost(inp->inp_laddr)) {
if (inp->inp_lport == 0) {
error = in_pcbbind(inp, NULL, l);
/*
* This used to ignore the return value
* completely, but we need to check for
* ephemeral port shortage.
* And attempts to request low ports if not root.
*/
if (error != 0)
return (error);
}
inp->inp_laddr = laddr;
}
inp->inp_faddr = sin->sin_addr;
inp->inp_fport = sin->sin_port;
/* Late bind, if needed */
if (inp->inp_bindportonsend) {
struct sockaddr_in lsin = *((const struct sockaddr_in *)
inp->inp_socket->so_proto->pr_domain->dom_sa_any);
lsin.sin_addr = inp->inp_laddr;
lsin.sin_port = 0;
if ((error = in_pcbbind_port(inp, &lsin, l->l_cred)) != 0)
return error;
}
in_pcbstate(inp, INP_CONNECTED);
#if defined(IPSEC)
if (ipsec_enabled && inp->inp_socket->so_type == SOCK_STREAM)
ipsec_pcbconn(inp->inp_sp);
#endif
return (0);
}
void
in_pcbdisconnect(void *v)
{
struct inpcb *inp = v;
if (inp->inp_af != AF_INET)
return;
inp->inp_faddr = zeroin_addr;
inp->inp_fport = 0;
in_pcbstate(inp, INP_BOUND);
#if defined(IPSEC)
if (ipsec_enabled)
ipsec_pcbdisconn(inp->inp_sp);
#endif
if (inp->inp_socket->so_state & SS_NOFDREF)
in_pcbdetach(inp);
}
void
in_pcbdetach(void *v)
{
struct inpcb *inp = v;
struct socket *so = inp->inp_socket;
int s;
if (inp->inp_af != AF_INET)
return;
#if defined(IPSEC)
if (ipsec_enabled)
ipsec_delete_pcbpolicy(inp);
#endif
so->so_pcb = NULL;
s = splsoftnet();
in_pcbstate(inp, INP_ATTACHED);
LIST_REMOVE(&inp->inp_head, inph_lhash);
TAILQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, inph_queue);
splx(s);
if (inp->inp_options) {
m_free(inp->inp_options);
}
rtcache_free(&inp->inp_route);
ip_freemoptions(inp->inp_moptions);
sofree(so); /* drops the socket's lock */
pool_put(&inpcb_pool, inp);
mutex_enter(softnet_lock); /* reacquire the softnet_lock */
}
void
in_setsockaddr(struct inpcb *inp, struct sockaddr_in *sin)
{
if (inp->inp_af != AF_INET)
return;
sockaddr_in_init(sin, &inp->inp_laddr, inp->inp_lport);
}
void
in_setpeeraddr(struct inpcb *inp, struct sockaddr_in *sin)
{
if (inp->inp_af != AF_INET)
return;
sockaddr_in_init(sin, &inp->inp_faddr, inp->inp_fport);
}
/*
* 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 splsoftnet.
*/
int
in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg,
struct in_addr laddr, u_int lport_arg, int errno,
void (*notify)(struct inpcb *, int))
{
struct inpcbhead *head;
struct inpcb_hdr *inph;
struct inpcb *inp;
u_int16_t fport = fport_arg, lport = lport_arg;
int nmatch;
if (in_nullhost(faddr) || notify == 0)
return (0);
nmatch = 0;
head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
LIST_FOREACH(inph, head, inph_hash) {
inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (in_hosteq(inp->inp_faddr, faddr) &&
inp->inp_fport == fport &&
inp->inp_lport == lport &&
in_hosteq(inp->inp_laddr, laddr)) {
(*notify)(inp, errno);
nmatch++;
}
}
return (nmatch);
}
void
in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno,
void (*notify)(struct inpcb *, int))
{
struct inpcb_hdr *inph;
if (in_nullhost(faddr) || notify == 0)
return;
TAILQ_FOREACH(inph, &table->inpt_queue, inph_queue) {
struct inpcb *inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (in_hosteq(inp->inp_faddr, faddr))
(*notify)(inp, errno);
}
}
void
in_purgeifmcast(struct ip_moptions *imo, struct ifnet *ifp)
{
int i, gap;
/* The owner of imo should be protected by solock */
KASSERT(ifp != NULL);
if (imo == NULL)
return;
/*
* Unselect the outgoing interface if it is being
* detached.
*/
if (imo->imo_multicast_if_index == ifp->if_index)
imo->imo_multicast_if_index = 0;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
*/
for (i = 0, gap = 0; i < imo->imo_num_memberships; i++) {
if (imo->imo_membership[i]->inm_ifp == ifp) {
in_delmulti(imo->imo_membership[i]);
gap++;
} else if (gap != 0)
imo->imo_membership[i - gap] = imo->imo_membership[i];
}
imo->imo_num_memberships -= gap;
}
void
in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp)
{
struct inpcb_hdr *inph;
TAILQ_FOREACH(inph, &table->inpt_queue, inph_queue) {
struct inpcb *inp = (struct inpcb *)inph;
bool need_unlock = false;
if (inp->inp_af != AF_INET)
continue;
/* The caller holds either one of inps' lock */
if (!inp_locked(inp)) {
inp_lock(inp);
need_unlock = true;
}
/* IFNET_LOCK must be taken after solock */
in_purgeifmcast(inp->inp_moptions, ifp);
if (need_unlock)
inp_unlock(inp);
}
}
void
in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp)
{
struct rtentry *rt;
struct inpcb_hdr *inph;
TAILQ_FOREACH(inph, &table->inpt_queue, inph_queue) {
struct inpcb *inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if ((rt = rtcache_validate(&inp->inp_route)) != NULL &&
rt->rt_ifp == ifp) {
rtcache_unref(rt, &inp->inp_route);
in_rtchange(inp, 0);
} else
rtcache_unref(rt, &inp->inp_route);
}
}
/*
* 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(struct inpcb *inp)
{
struct rtentry *rt;
struct rt_addrinfo info;
if (inp->inp_af != AF_INET)
return;
if ((rt = rtcache_validate(&inp->inp_route)) == NULL)
return;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_route);
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) {
int error;
struct rtentry *nrt;
error = rtrequest(RTM_DELETE, rt_getkey(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, &nrt);
rtcache_unref(rt, &inp->inp_route);
if (error == 0)
rt_free(nrt);
} else
rtcache_unref(rt, &inp->inp_route);
/*
* A new route can be allocated
* the next time output is attempted.
*/
rtcache_free(&inp->inp_route);
}
/*
* After a routing change, flush old routing. A new route can be
* allocated the next time output is attempted.
*/
void
in_rtchange(struct inpcb *inp, int errno)
{
if (inp->inp_af != AF_INET)
return;
rtcache_free(&inp->inp_route);
/* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
}
struct inpcb *
in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr,
u_int lport_arg, int lookup_wildcard, vestigial_inpcb_t *vp)
{
struct inpcbhead *head;
struct inpcb_hdr *inph;
struct inpcb *match = NULL;
int matchwild = 3;
int wildcard;
u_int16_t lport = lport_arg;
if (vp)
vp->valid = 0;
head = INPCBHASH_PORT(table, lport);
LIST_FOREACH(inph, head, inph_lhash) {
struct inpcb * const inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (inp->inp_lport != lport)
continue;
/*
* check if inp's faddr and laddr match with ours.
* our faddr is considered null.
* count the number of wildcard matches. (0 - 2)
*
* null null match
* A null wildcard match
* null B wildcard match
* A B non match
* A A match
*/
wildcard = 0;
if (!in_nullhost(inp->inp_faddr))
wildcard++;
if (in_nullhost(inp->inp_laddr)) {
if (!in_nullhost(laddr))
wildcard++;
} else {
if (in_nullhost(laddr))
wildcard++;
else {
if (!in_hosteq(inp->inp_laddr, laddr))
continue;
}
}
if (wildcard && !lookup_wildcard)
continue;
/*
* prefer an address with less wildcards.
*/
if (wildcard < matchwild) {
match = inp;
matchwild = wildcard;
if (matchwild == 0)
break;
}
}
if (match && matchwild == 0)
return match;
if (vp && table->vestige) {
void *state = (*table->vestige->init_ports4)(laddr, lport_arg, lookup_wildcard);
vestigial_inpcb_t better;
while (table->vestige
&& (*table->vestige->next_port4)(state, vp)) {
if (vp->lport != lport)
continue;
wildcard = 0;
if (!in_nullhost(vp->faddr.v4))
wildcard++;
if (in_nullhost(vp->laddr.v4)) {
if (!in_nullhost(laddr))
wildcard++;
} else {
if (in_nullhost(laddr))
wildcard++;
else {
if (!in_hosteq(vp->laddr.v4, laddr))
continue;
}
}
if (wildcard && !lookup_wildcard)
continue;
if (wildcard < matchwild) {
better = *vp;
match = (void*)&better;
matchwild = wildcard;
if (matchwild == 0)
break;
}
}
if (match) {
if (match != (void*)&better)
return match;
else {
*vp = better;
return 0;
}
}
}
return (match);
}
#ifdef DIAGNOSTIC
int in_pcbnotifymiss = 0;
#endif
struct inpcb *
in_pcblookup_connect(struct inpcbtable *table,
struct in_addr faddr, u_int fport_arg,
struct in_addr laddr, u_int lport_arg,
vestigial_inpcb_t *vp)
{
struct inpcbhead *head;
struct inpcb_hdr *inph;
struct inpcb *inp;
u_int16_t fport = fport_arg, lport = lport_arg;
if (vp)
vp->valid = 0;
head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
LIST_FOREACH(inph, head, inph_hash) {
inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (in_hosteq(inp->inp_faddr, faddr) &&
inp->inp_fport == fport &&
inp->inp_lport == lport &&
in_hosteq(inp->inp_laddr, laddr))
goto out;
}
if (vp && table->vestige) {
if ((*table->vestige->lookup4)(faddr, fport_arg,
laddr, lport_arg, vp))
return 0;
}
#ifdef DIAGNOSTIC
if (in_pcbnotifymiss) {
printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n",
ntohl(faddr.s_addr), ntohs(fport),
ntohl(laddr.s_addr), ntohs(lport));
}
#endif
return (0);
out:
/* Move this PCB to the head of hash chain. */
inph = &inp->inp_head;
if (inph != LIST_FIRST(head)) {
LIST_REMOVE(inph, inph_hash);
LIST_INSERT_HEAD(head, inph, inph_hash);
}
return (inp);
}
struct inpcb *
in_pcblookup_bind(struct inpcbtable *table,
struct in_addr laddr, u_int lport_arg)
{
struct inpcbhead *head;
struct inpcb_hdr *inph;
struct inpcb *inp;
u_int16_t lport = lport_arg;
head = INPCBHASH_BIND(table, laddr, lport);
LIST_FOREACH(inph, head, inph_hash) {
inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (inp->inp_lport == lport &&
in_hosteq(inp->inp_laddr, laddr))
goto out;
}
head = INPCBHASH_BIND(table, zeroin_addr, lport);
LIST_FOREACH(inph, head, inph_hash) {
inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (inp->inp_lport == lport &&
in_hosteq(inp->inp_laddr, zeroin_addr))
goto out;
}
#ifdef DIAGNOSTIC
if (in_pcbnotifymiss) {
printf("in_pcblookup_bind: laddr=%08x lport=%d\n",
ntohl(laddr.s_addr), ntohs(lport));
}
#endif
return (0);
out:
/* Move this PCB to the head of hash chain. */
inph = &inp->inp_head;
if (inph != LIST_FIRST(head)) {
LIST_REMOVE(inph, inph_hash);
LIST_INSERT_HEAD(head, inph, inph_hash);
}
return (inp);
}
void
in_pcbstate(struct inpcb *inp, int state)
{
if (inp->inp_af != AF_INET)
return;
if (inp->inp_state > INP_ATTACHED)
LIST_REMOVE(&inp->inp_head, inph_hash);
switch (state) {
case INP_BOUND:
LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table,
inp->inp_laddr, inp->inp_lport), &inp->inp_head,
inph_hash);
break;
case INP_CONNECTED:
LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table,
inp->inp_faddr, inp->inp_fport,
inp->inp_laddr, inp->inp_lport), &inp->inp_head,
inph_hash);
break;
}
inp->inp_state = state;
}
struct rtentry *
in_pcbrtentry(struct inpcb *inp)
{
struct route *ro;
union {
struct sockaddr dst;
struct sockaddr_in dst4;
} u;
if (inp->inp_af != AF_INET)
return (NULL);
ro = &inp->inp_route;
sockaddr_in_init(&u.dst4, &inp->inp_faddr, 0);
return rtcache_lookup(ro, &u.dst);
}
void
in_pcbrtentry_unref(struct rtentry *rt, struct inpcb *inp)
{
rtcache_unref(rt, &inp->inp_route);
}
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