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keysock.c
464 lines (398 loc) · 10.4 KB
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keysock.c
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/* $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])] };