/*
* 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
*/
/*
* inpcb_create: construct a new PCB and associated with a given socket.
* Sets the PCB state to INP_ATTACHED and makes PCB globally visible.
*/
int
inpcb_create(struct socket *so, void *v)
{
struct inpcbtable *table = v;
struct inpcb *inp;
int s;
int
inpcb_bindableaddr(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 inpcb_bind_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
inpcb_bind_addr(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
{
int error;
error = inpcb_bindableaddr(inp, sin, cred);
if (error == 0)
in4p_laddr(inp) = sin->sin_addr;
return 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;
}
/*
* inpcb_bind: assign a local IP address and port number to the PCB.
*
* If the address is not a wildcard, verify that it corresponds to a
* local interface. If a port is specified and it is privileged, then
* check the permission. Check whether the address or port is in use,
* and if so, whether we can re-use them.
*/
int
inpcb_bind(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(in4p_laddr(inp)))
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 = inpcb_bind_addr(inp, sin, l->l_cred);
if (error)
return error;
/* Bind port. */
error = inpcb_bind_port(inp, sin, l->l_cred);
if (error) {
in4p_laddr(inp).s_addr = INADDR_ANY;
return error;
}
return 0;
}
/*
* inpcb_connect: connect from a socket to a specified address, i.e.,
* assign a foreign IP address and port number to the PCB.
*
* Both address and port must be specified in the name argument.
* If there is no local address for this socket yet, then pick one.
*/
int
inpcb_connect(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(in4p_laddr(inp))) {
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 = in4p_laddr(inp);
if (inpcb_lookup(inp->inp_table, sin->sin_addr, sin->sin_port,
laddr, inp->inp_lport, &vestige) != NULL ||
vestige.valid) {
return EADDRINUSE;
}
if (in_nullhost(in4p_laddr(inp))) {
if (inp->inp_lport == 0) {
error = inpcb_bind(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;
}
in4p_laddr(inp) = laddr;
}
in4p_faddr(inp) = 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 = in4p_laddr(inp);
lsin.sin_port = 0;
/*
* inpcb_notify: pass some notification to all connections of a protocol
* associated with destination address. The local address and/or port
* numbers may be specified to limit the search. The "usual action" will
* be taken, depending on the command.
*
* The caller must filter any commands that are not interesting (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
inpcb_notify(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 *inp;
in_port_t fport = fport_arg, lport = lport_arg;
int nmatch;
if (in_nullhost(faddr) || notify == NULL)
return 0;
nmatch = 0;
head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
LIST_FOREACH(inp, head, inp_hash) {
if (inp->inp_af != AF_INET)
continue;
TAILQ_FOREACH(inp, &table->inpt_queue, inp_queue) {
if (inp->inp_af != AF_INET)
continue;
if (in_hosteq(in4p_faddr(inp), 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;
}
/*
* inpcb_losing: 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
inpcb_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;
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_newmsg_dynamic(RTM_DELETE, nrt);
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);
}
/*
* inpcb_rtchange: after a routing change, flush old routing.
* A new route can be allocated the next time output is attempted.
*/
void
inpcb_rtchange(struct inpcb *inp, int errno)
{
if (inp->inp_af != AF_INET)
return;
rtcache_free(&inp->inp_route);
/* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
}
/*
* inpcb_lookup_local: find a PCB by looking at the local port and matching
* the local address or resolving the wildcards. Primarily used to detect
* when the local address is already in use.
*/
struct inpcb *
inpcb_lookup_local(struct inpcbtable *table, struct in_addr laddr,
u_int lport_arg, int lookup_wildcard, vestigial_inpcb_t *vp)
{
struct inpcbhead *head;
struct inpcb *inp;
struct inpcb *match = NULL;
int matchwild = 3;
int wildcard;
in_port_t lport = lport_arg;
if (vp)
vp->valid = 0;
head = INPCBHASH_PORT(table, lport);
LIST_FOREACH(inp, head, inp_lhash) {
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(in4p_faddr(inp)))
wildcard++;
if (in_nullhost(in4p_laddr(inp))) {
if (!in_nullhost(laddr))
wildcard++;
} else {
if (in_nullhost(laddr))
wildcard++;
else {
if (!in_hosteq(in4p_laddr(inp), 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;
out:
/* Move this PCB to the head of hash chain. */
if (inp != LIST_FIRST(head)) {
LIST_REMOVE(inp, inp_hash);
LIST_INSERT_HEAD(head, inp, inp_hash);
}
return inp;
}
/*
* inpcb_lookup_bound: find a PCB by looking at the local address and port.
* Primarily used to find the listening (i.e., already bound) socket.
*/
struct inpcb *
inpcb_lookup_bound(struct inpcbtable *table,
struct in_addr laddr, u_int lport_arg)
{
struct inpcbhead *head;
struct inpcb *inp;
in_port_t lport = lport_arg;
head = INPCBHASH_BIND(table, laddr, lport);
LIST_FOREACH(inp, head, inp_hash) {
if (inp->inp_af != AF_INET)
continue;
if (inp->inp_lport == lport &&
in_hosteq(in4p_laddr(inp), laddr))
goto out;
}
head = INPCBHASH_BIND(table, zeroin_addr, lport);
LIST_FOREACH(inp, head, inp_hash) {
if (inp->inp_af != AF_INET)
continue;
out:
/* Move this PCB to the head of hash chain. */
if (inp != LIST_FIRST(head)) {
LIST_REMOVE(inp, inp_hash);
LIST_INSERT_HEAD(head, inp, inp_hash);
}
return inp;
}
void
inpcb_set_state(struct inpcb *inp, int state)
{
#ifdef INET6
if (inp->inp_af == AF_INET6) {
in6pcb_set_state(inp, state);
return;
}
#else
if (inp->inp_af != AF_INET)
return;
#endif
if (inp->inp_state > INP_ATTACHED)
LIST_REMOVE(inp, inp_hash);
