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097dcc115d
freebsd/sys/netkey/keysock.c
Robert Watson a152f8a361 Change semantics of socket close and detach. Add a new protocol switch 
function, pru_close, to notify protocols that the file descriptor or
other consumer of a socket is closing the socket.  pru_abort is now a
notification of close also, and no longer detaches.  pru_detach is no
longer used to notify of close, and will be called during socket
tear-down by sofree() when all references to a socket evaporate after
an earlier call to abort or close the socket.  This means detach is now
an unconditional teardown of a socket, whereas previously sockets could
persist after detach of the protocol retained a reference.

This faciliates sharing mutexes between layers of the network stack as
the mutex is required during the checking and removal of references at
the head of sofree().  With this change, pru_detach can now assume that
the mutex will no longer be required by the socket layer after
completion, whereas before this was not necessarily true.

Reviewed by:	gnn
2006-07-21 17:11:15 +00:00

508 lines
11 KiB
C
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/* $KAME: keysock.c,v 1.32 2003/08/22 05:45:08 itojun 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ipsec.h"
/* This code has derived from sys/net/rtsock.c on FreeBSD 2.2.5 */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <net/raw_cb.h>
#include <net/route.h>
#include <netinet/in.h>
#include <net/pfkeyv2.h>
#include <netkey/keydb.h>
#include <netkey/key.h>
#include <netkey/keysock.h>
#include <netkey/key_debug.h>
#include <machine/stdarg.h>
struct sockaddr key_dst = { 2, PF_KEY, };
struct sockaddr key_src = { 2, PF_KEY, };
static int key_sendup0(struct rawcb *, struct mbuf *, int);
struct pfkeystat pfkeystat;
/*
* key_output()
*/
int
key_output(struct mbuf *m, struct socket *so)
{
struct sadb_msg *msg;
int len, error = 0;
int s;
if (m == 0)
panic("key_output: NULL pointer was passed.");
pfkeystat.out_total++;
pfkeystat.out_bytes += m->m_pkthdr.len;
len = m->m_pkthdr.len;
if (len < sizeof(struct sadb_msg)) {
pfkeystat.out_tooshort++;
error = EINVAL;
goto end;
}
if (m->m_len < sizeof(struct sadb_msg)) {
if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
pfkeystat.out_nomem++;
error = ENOBUFS;
goto end;
}
}
M_ASSERTPKTHDR(m);
KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
msg = mtod(m, struct sadb_msg *);
pfkeystat.out_msgtype[msg->sadb_msg_type]++;
if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
pfkeystat.out_invlen++;
error = EINVAL;
goto end;
}
/*XXX giant lock*/
s = splnet();
error = key_parse(m, so);
m = NULL;
splx(s);
end:
if (m)
m_freem(m);
return error;
}
/*
* send message to the socket.
*/
static int
key_sendup0(rp, m, promisc)
struct rawcb *rp;
struct mbuf *m;
int promisc;
{
int error;
if (promisc) {
struct sadb_msg *pmsg;
M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
if (m && m->m_len < sizeof(struct sadb_msg))
m = m_pullup(m, sizeof(struct sadb_msg));
if (!m) {
pfkeystat.in_nomem++;
return ENOBUFS;
}
m->m_pkthdr.len += sizeof(*pmsg);
pmsg = mtod(m, struct sadb_msg *);
bzero(pmsg, sizeof(*pmsg));
pmsg->sadb_msg_version = PF_KEY_V2;
pmsg->sadb_msg_type = SADB_X_PROMISC;
pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
/* pid and seq? */
pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
}
if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
m, NULL)) {
pfkeystat.in_nomem++;
m_freem(m);
error = ENOBUFS;
} else
error = 0;
sorwakeup(rp->rcb_socket);
return error;
}
/* so can be NULL if target != KEY_SENDUP_ONE */
int
key_sendup_mbuf(so, m, target)
struct socket *so;
struct mbuf *m;
int target;
{
struct mbuf *n;
struct keycb *kp;
int sendup;
struct rawcb *rp;
int error = 0;
if (m == NULL)
panic("key_sendup_mbuf: NULL pointer was passed.");
if (so == NULL && target == KEY_SENDUP_ONE)
panic("key_sendup_mbuf: NULL pointer was passed.");
pfkeystat.in_total++;
pfkeystat.in_bytes += m->m_pkthdr.len;
if (m->m_len < sizeof(struct sadb_msg)) {
m = m_pullup(m, sizeof(struct sadb_msg));
if (m == NULL) {
pfkeystat.in_nomem++;
return ENOBUFS;
}
}
if (m->m_len >= sizeof(struct sadb_msg)) {
struct sadb_msg *msg;
msg = mtod(m, struct sadb_msg *);
pfkeystat.in_msgtype[msg->sadb_msg_type]++;
}
LIST_FOREACH(rp, &rawcb_list, list) {
if (rp->rcb_proto.sp_family != PF_KEY)
continue;
if (rp->rcb_proto.sp_protocol &&
rp->rcb_proto.sp_protocol != PF_KEY_V2) {
continue;
}
kp = (struct keycb *)rp;
/*
* If you are in promiscuous mode, and when you get broadcasted
* reply, you'll get two PF_KEY messages.
* (based on pf_key@inner.net message on 14 Oct 1998)
*/
if (((struct keycb *)rp)->kp_promisc) {
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
(void)key_sendup0(rp, n, 1);
n = NULL;
}
}
/* the exact target will be processed later */
if (so && sotorawcb(so) == rp)
continue;
sendup = 0;
switch (target) {
case KEY_SENDUP_ONE:
/* the statement has no effect */
if (so && sotorawcb(so) == rp)
sendup++;
break;
case KEY_SENDUP_ALL:
sendup++;
break;
case KEY_SENDUP_REGISTERED:
if (kp->kp_registered)
sendup++;
break;
}
pfkeystat.in_msgtarget[target]++;
if (!sendup)
continue;
if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
m_freem(m);
pfkeystat.in_nomem++;
return ENOBUFS;
}
/*
* ignore error even if queue is full. PF_KEY does not
* guarantee the delivery of the message.
* this is important when target == KEY_SENDUP_ALL.
*/
key_sendup0(rp, n, 0);
n = NULL;
}
if (so) {
error = key_sendup0(sotorawcb(so), m, 0);
m = NULL;
} else {
error = 0;
m_freem(m);
}
return error;
}
/*
* key_abort()
* derived from net/rtsock.c:rts_abort()
*/
static void
key_abort(struct socket *so)
{
raw_usrreqs.pru_abort(so);
}
/*
* key_attach()
* derived from net/rtsock.c:rts_attach()
*/
static int
key_attach(struct socket *so, int proto, struct thread *p)
{
struct keycb *kp;
int s, error;
KASSERT(sotorawcb(so) == NULL, ("key_attach: so_pcb != NULL"));
kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK); /* XXX */
if (kp == 0)
return ENOBUFS;
bzero(kp, sizeof *kp);
/*
* The splnet() is necessary to block protocols from sending
* error notifications (like RTM_REDIRECT or RTM_LOSING) while
* this PCB is extant but incompletely initialized.
* Probably we should try to do more of this work beforehand and
* eliminate the spl.
*/
s = splnet();
so->so_pcb = (caddr_t)kp;
error = raw_usrreqs.pru_attach(so, proto, p);
kp = (struct keycb *)sotorawcb(so);
if (error) {
free(kp, M_PCB);
so->so_pcb = (caddr_t) 0;
splx(s);
return error;
}
kp->kp_promisc = kp->kp_registered = 0;
if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
key_cb.key_count++;
key_cb.any_count++;
kp->kp_raw.rcb_laddr = &key_src;
kp->kp_raw.rcb_faddr = &key_dst;
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
splx(s);
return 0;
}
/*
* key_bind()
* derived from net/rtsock.c:rts_bind()
*/
static int
key_bind(struct socket *so, struct sockaddr *nam, struct thread *p)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_bind(so, nam, p); /* xxx just EINVAL */
splx(s);
return error;
}
/*
* key_close()
* derived from net/rtsock.c:rts_close()
*/
static void
key_close(struct socket *so)
{
raw_usrreqs.pru_close(so);
}
/*
* key_connect()
* derived from net/rtsock.c:rts_connect()
*/
static int
key_connect(struct socket *so, struct sockaddr *nam, struct thread *p)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_connect(so, nam, p); /* XXX just EINVAL */
splx(s);
return error;
}
/*
* key_detach()
* derived from net/rtsock.c:rts_detach()
*/
static void
key_detach(struct socket *so)
{
struct keycb *kp = (struct keycb *)sotorawcb(so);
KASSERT(kp != NULL, ("key_detach: kp == NULL"));
if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
key_cb.key_count--;
key_cb.any_count--;
key_freereg(so);
raw_usrreqs.pru_detach(so);
}
/*
* key_disconnect()
* derived from net/rtsock.c:key_disconnect()
*/
static int
key_disconnect(struct socket *so)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_disconnect(so);
splx(s);
return error;
}
/*
* key_peeraddr()
* derived from net/rtsock.c:rts_peeraddr()
*/
static int
key_peeraddr(struct socket *so, struct sockaddr **nam)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_peeraddr(so, nam);
splx(s);
return error;
}
/*
* key_send()
* derived from net/rtsock.c:rts_send()
*/
static int
key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct thread *p)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_send(so, flags, m, nam, control, p);
splx(s);
return error;
}
/*
* key_shutdown()
* derived from net/rtsock.c:rts_shutdown()
*/
static int
key_shutdown(struct socket *so)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_shutdown(so);
splx(s);
return error;
}
/*
* key_sockaddr()
* derived from net/rtsock.c:rts_sockaddr()
*/
static int
key_sockaddr(struct socket *so, struct sockaddr **nam)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_sockaddr(so, nam);
splx(s);
return error;
}
struct pr_usrreqs key_usrreqs = {
.pru_abort = key_abort,
.pru_attach = key_attach,
.pru_bind = key_bind,
.pru_connect = key_connect,
.pru_detach = key_detach,
.pru_disconnect = key_disconnect,
.pru_peeraddr = key_peeraddr,
.pru_send = key_send,
.pru_shutdown = key_shutdown,
.pru_sockaddr = key_sockaddr,
.pru_close = key_close,
};
/* sysctl */
SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
/*
* Definitions of protocols supported in the KEY domain.
*/
extern struct domain keydomain;
struct protosw keysw[] = {
{
.pr_type = SOCK_RAW,
.pr_domain = &keydomain,
.pr_protocol = PF_KEY_V2,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_output = key_output,
.pr_ctlinput = raw_ctlinput,
.pr_init = raw_init,
.pr_usrreqs = &key_usrreqs
}
};
struct domain keydomain = {
.dom_family = PF_KEY,
.dom_name = "key",
.dom_init = key_init,
.dom_protosw = keysw,
.dom_protoswNPROTOSW = &keysw[sizeof(keysw)/sizeof(keysw[0])]
};
DOMAIN_SET(key);
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