465 lines
10 KiB
C
465 lines
10 KiB
C
/* $NetBSD: keysock.c,v 1.39 2004/07/24 09:15:56 yamt Exp $ */
|
|
/* $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>
|
|
__KERNEL_RCSID(0, "$NetBSD: keysock.c,v 1.39 2004/07/24 09:15:56 yamt Exp $");
|
|
|
|
#include "opt_inet.h"
|
|
|
|
/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/queue.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, };
|
|
|
|
struct pfkeystat pfkeystat;
|
|
|
|
static int key_receive __P((struct socket *, struct mbuf **, struct uio *,
|
|
struct mbuf **, struct mbuf **, int *));
|
|
|
|
static int key_sendup0 __P((struct rawcb *, struct mbuf *, int, int));
|
|
|
|
static int
|
|
key_receive(struct socket *so, struct mbuf **paddr, struct uio *uio,
|
|
struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
|
|
{
|
|
struct rawcb *rp = sotorawcb(so);
|
|
struct keycb *kp = (struct keycb *)rp;
|
|
int error;
|
|
int s;
|
|
|
|
error = (*kp->kp_receive)(so, paddr, uio, mp0, controlp, flagsp);
|
|
|
|
/*
|
|
* now we might have enough receive buffer space.
|
|
* pull packets from kp_queue as many as possible.
|
|
*/
|
|
s = splsoftnet();
|
|
while (/*CONSTCOND*/ 1) {
|
|
struct mbuf *m;
|
|
|
|
m = kp->kp_queue;
|
|
if (m == NULL || sbspace(&so->so_rcv) < m->m_pkthdr.len)
|
|
break;
|
|
kp->kp_queue = m->m_nextpkt;
|
|
m->m_nextpkt = NULL; /* safety */
|
|
if (key_sendup0(rp, m, 0, 1))
|
|
break;
|
|
}
|
|
splx(s);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* key_usrreq()
|
|
* derived from net/rtsock.c:route_usrreq()
|
|
*/
|
|
int
|
|
key_usrreq(so, req, m, nam, control, p)
|
|
struct socket *so;
|
|
int req;
|
|
struct mbuf *m, *nam, *control;
|
|
struct proc *p;
|
|
{
|
|
int error = 0;
|
|
struct keycb *kp = (struct keycb *)sotorawcb(so);
|
|
int s;
|
|
|
|
s = splsoftnet();
|
|
if (req == PRU_ATTACH) {
|
|
kp = (struct keycb *)malloc(sizeof(*kp), M_PCB,
|
|
M_WAITOK|M_ZERO);
|
|
so->so_pcb = (caddr_t)kp;
|
|
kp->kp_receive = so->so_receive;
|
|
so->so_receive = key_receive;
|
|
}
|
|
if (req == PRU_DETACH && kp) {
|
|
int af = kp->kp_raw.rcb_proto.sp_protocol;
|
|
struct mbuf *n;
|
|
|
|
if (af == PF_KEY)
|
|
key_cb.key_count--;
|
|
key_cb.any_count--;
|
|
|
|
key_freereg(so);
|
|
|
|
while (kp->kp_queue) {
|
|
n = kp->kp_queue->m_nextpkt;
|
|
kp->kp_queue->m_nextpkt = NULL;
|
|
m_freem(kp->kp_queue);
|
|
kp->kp_queue = n;
|
|
}
|
|
}
|
|
|
|
error = raw_usrreq(so, req, m, nam, control, p);
|
|
m = control = NULL; /* reclaimed in raw_usrreq */
|
|
kp = (struct keycb *)sotorawcb(so);
|
|
if (req == PRU_ATTACH && kp) {
|
|
int af = kp->kp_raw.rcb_proto.sp_protocol;
|
|
if (error) {
|
|
pfkeystat.sockerr++;
|
|
free((caddr_t)kp, M_PCB);
|
|
so->so_pcb = (caddr_t) 0;
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
kp->kp_promisc = kp->kp_registered = 0;
|
|
|
|
if (af == PF_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 (error);
|
|
}
|
|
|
|
/*
|
|
* key_output()
|
|
*/
|
|
int
|
|
key_output(struct mbuf *m, ...)
|
|
{
|
|
struct sadb_msg *msg;
|
|
int len, error = 0;
|
|
int s;
|
|
struct socket *so;
|
|
va_list ap;
|
|
|
|
va_start(ap, m);
|
|
so = va_arg(ap, struct socket *);
|
|
va_end(ap);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
if ((m->m_flags & M_PKTHDR) == 0)
|
|
panic("key_output: not M_PKTHDR ??");
|
|
|
|
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 = splsoftnet();
|
|
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, canwait)
|
|
struct rawcb *rp;
|
|
struct mbuf *m;
|
|
int promisc;
|
|
int canwait;
|
|
{
|
|
struct keycb *kp = (struct keycb *)rp;
|
|
struct mbuf *n;
|
|
int error = 0;
|
|
|
|
if (promisc) {
|
|
struct sadb_msg *pmsg;
|
|
|
|
M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
|
|
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 (canwait) {
|
|
if (kp->kp_queue) {
|
|
for (n = kp->kp_queue; n && n->m_nextpkt;
|
|
n = n->m_nextpkt)
|
|
;
|
|
n->m_nextpkt = m;
|
|
m = kp->kp_queue;
|
|
kp->kp_queue = NULL;
|
|
} else
|
|
m->m_nextpkt = NULL; /* just for safety */
|
|
} else
|
|
m->m_nextpkt = NULL;
|
|
|
|
for (; m && error == 0; m = n) {
|
|
n = m->m_nextpkt;
|
|
|
|
if (canwait &&
|
|
sbspace(&rp->rcb_socket->so_rcv) < m->m_pkthdr.len) {
|
|
error = EAGAIN;
|
|
goto recovery;
|
|
}
|
|
|
|
m->m_nextpkt = NULL;
|
|
|
|
if (!sbappendaddr(&rp->rcb_socket->so_rcv,
|
|
(struct sockaddr *)&key_src, m, NULL)) {
|
|
pfkeystat.in_nomem++;
|
|
error = ENOBUFS;
|
|
goto recovery;
|
|
} else {
|
|
sorwakeup(rp->rcb_socket);
|
|
error = 0;
|
|
}
|
|
}
|
|
return (error);
|
|
|
|
recovery:
|
|
if (kp->kp_queue) {
|
|
/*
|
|
* kp_queue != NULL implies !canwait.
|
|
*/
|
|
KASSERT(!canwait);
|
|
KASSERT(m->m_nextpkt == NULL);
|
|
/*
|
|
* insert m to the head of queue, as normally mbuf on the queue
|
|
* is less important than others.
|
|
*/
|
|
if (m) {
|
|
m->m_nextpkt = kp->kp_queue;
|
|
kp->kp_queue = m;
|
|
}
|
|
} else {
|
|
/* recover the queue */
|
|
if (!m) {
|
|
/* first ENOBUFS case */
|
|
kp->kp_queue = n;
|
|
} else {
|
|
kp->kp_queue = m;
|
|
m->m_nextpkt = n;
|
|
}
|
|
}
|
|
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;
|
|
int canwait;
|
|
|
|
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.");
|
|
|
|
canwait = target & KEY_SENDUP_CANWAIT;
|
|
target &= ~KEY_SENDUP_CANWAIT;
|
|
|
|
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]++;
|
|
}
|
|
|
|
for (rp = rawcb.lh_first; rp; rp = rp->rcb_list.le_next)
|
|
{
|
|
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, canwait);
|
|
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, canwait);
|
|
|
|
n = NULL;
|
|
}
|
|
|
|
if (so) {
|
|
error = key_sendup0(sotorawcb(so), m, 0, canwait);
|
|
m = NULL;
|
|
} else {
|
|
error = 0;
|
|
m_freem(m);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* Definitions of protocols supported in the KEY domain.
|
|
*/
|
|
|
|
extern struct domain keydomain;
|
|
|
|
const struct protosw keysw[] = {
|
|
{ SOCK_RAW, &keydomain, PF_KEY_V2, PR_ATOMIC|PR_ADDR,
|
|
0, key_output, raw_ctlinput, 0,
|
|
key_usrreq,
|
|
raw_init, 0, 0, 0,
|
|
NULL,
|
|
}
|
|
};
|
|
|
|
struct domain keydomain =
|
|
{ PF_KEY, "key", key_init, 0, 0,
|
|
keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
|
|
|