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NetBSD/sys/netipsec/keysock.c

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/* $NetBSD: keysock.c,v 1.43 2014/08/09 05:33:01 rtr Exp $ */
/* $FreeBSD: src/sys/netipsec/keysock.c,v 1.3.2.1 2003/01/24 05:11:36 sam Exp $ */
/* $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 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 1.43 2014/08/09 05:33:01 rtr Exp $");
#include "opt_ipsec.h"
/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/mbuf.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 <net/pfkeyv2.h>
#include <netipsec/key.h>
#include <netipsec/keysock.h>
#include <netipsec/key_debug.h>
#include <netipsec/ipsec_osdep.h>
#include <netipsec/ipsec_private.h>
typedef int pr_output_t (struct mbuf *, struct socket *);
struct key_cb {
int key_count;
int any_count;
};
static struct key_cb key_cb;
static struct sockaddr key_dst = {
.sa_len = 2,
.sa_family = PF_KEY,
};
static struct sockaddr key_src = {
.sa_len = 2,
.sa_family = PF_KEY,
};
static int key_sendup0(struct rawcb *, struct mbuf *, int, int);
int key_registered_sb_max = (2048 * MHLEN); /* XXX arbitrary */
/*
* 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");
{
uint64_t *ps = PFKEY_STAT_GETREF();
ps[PFKEY_STAT_OUT_TOTAL]++;
ps[PFKEY_STAT_OUT_BYTES] += m->m_pkthdr.len;
PFKEY_STAT_PUTREF();
}
len = m->m_pkthdr.len;
if (len < sizeof(struct sadb_msg)) {
PFKEY_STATINC(PFKEY_STAT_OUT_TOOSHORT);
error = EINVAL;
goto end;
}
if (m->m_len < sizeof(struct sadb_msg)) {
if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
PFKEY_STATINC(PFKEY_STAT_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 *);
PFKEY_STATINC(PFKEY_STAT_OUT_MSGTYPE + msg->sadb_msg_type);
if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
PFKEY_STATINC(PFKEY_STAT_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(
struct rawcb *rp,
struct mbuf *m,
int promisc,
int sbprio
)
{
int error;
int ok;
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) {
PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
return ENOBUFS;
}
m->m_pkthdr.len += sizeof(*pmsg);
pmsg = mtod(m, struct sadb_msg *);
memset(pmsg, 0, 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? */
PFKEY_STATINC(PFKEY_STAT_IN_MSGTYPE + pmsg->sadb_msg_type);
}
if (sbprio == 0)
ok = sbappendaddr(&rp->rcb_socket->so_rcv,
(struct sockaddr *)&key_src, m, NULL);
else
ok = sbappendaddrchain(&rp->rcb_socket->so_rcv,
(struct sockaddr *)&key_src, m, sbprio);
if (!ok) {
PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
m_freem(m);
error = ENOBUFS;
} else
error = 0;
sorwakeup(rp->rcb_socket);
return error;
}
/* XXX this interface should be obsoleted. */
int
key_sendup(struct socket *so, struct sadb_msg *msg, u_int len,
int target) /*target of the resulting message*/
{
struct mbuf *m, *n, *mprev;
int tlen;
/* sanity check */
if (so == 0 || msg == 0)
panic("key_sendup: NULL pointer was passed");
KEYDEBUG(KEYDEBUG_KEY_DUMP,
printf("key_sendup: \n");
kdebug_sadb(msg));
/*
* we increment statistics here, just in case we have ENOBUFS
* in this function.
*/
{
uint64_t *ps = PFKEY_STAT_GETREF();
ps[PFKEY_STAT_IN_TOTAL]++;
ps[PFKEY_STAT_IN_BYTES] += len;
ps[PFKEY_STAT_IN_MSGTYPE + msg->sadb_msg_type]++;
PFKEY_STAT_PUTREF();
}
/*
* Get mbuf chain whenever possible (not clusters),
* to save socket buffer. We'll be generating many SADB_ACQUIRE
* messages to listening key sockets. If we simply allocate clusters,
* sbappendaddr() will raise ENOBUFS due to too little sbspace().
* sbspace() computes # of actual data bytes AND mbuf region.
*
* TODO: SADB_ACQUIRE filters should be implemented.
*/
tlen = len;
m = mprev = NULL;
while (tlen > 0) {
int mlen;
if (tlen == len) {
MGETHDR(n, M_DONTWAIT, MT_DATA);
mlen = MHLEN;
} else {
MGET(n, M_DONTWAIT, MT_DATA);
mlen = MLEN;
}
if (!n) {
PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
return ENOBUFS;
}
n->m_len = mlen;
if (tlen >= MCLBYTES) { /*XXX better threshold? */
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
m_freem(m);
PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
return ENOBUFS;
}
n->m_len = MCLBYTES;
}
if (tlen < n->m_len)
n->m_len = tlen;
n->m_next = NULL;
if (m == NULL)
m = mprev = n;
else {
mprev->m_next = n;
mprev = n;
}
tlen -= n->m_len;
n = NULL;
}
m->m_pkthdr.len = len;
m->m_pkthdr.rcvif = NULL;
m_copyback(m, 0, len, msg);
/* avoid duplicated statistics */
{
uint64_t *ps = PFKEY_STAT_GETREF();
ps[PFKEY_STAT_IN_TOTAL]--;
ps[PFKEY_STAT_IN_BYTES] -= len;
ps[PFKEY_STAT_IN_MSGTYPE + msg->sadb_msg_type]--;
PFKEY_STAT_PUTREF();
}
return key_sendup_mbuf(so, m, target);
}
/* so can be NULL if target != KEY_SENDUP_ONE */
int
key_sendup_mbuf(struct socket *so, struct mbuf *m,
int target/*, sbprio */)
{
struct mbuf *n;
struct keycb *kp;
int sendup;
struct rawcb *rp;
int error = 0;
int sbprio = 0; /* XXX should be a parameter */
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");
/*
* RFC 2367 says ACQUIRE and other kernel-generated messages
* are special. We treat all KEY_SENDUP_REGISTERED messages
* as special, delivering them to all registered sockets
* even if the socket is at or above its so->so_rcv.sb_max limits.
* The only constraint is that the so_rcv data fall below
* key_registered_sb_max.
* Doing that check here avoids reworking every key_sendup_mbuf()
* in the short term. . The rework will be done after a technical
* conensus that this approach is appropriate.
*/
if (target == KEY_SENDUP_REGISTERED) {
sbprio = SB_PRIO_BESTEFFORT;
}
{
uint64_t *ps = PFKEY_STAT_GETREF();
ps[PFKEY_STAT_IN_TOTAL]++;
ps[PFKEY_STAT_IN_BYTES] += m->m_pkthdr.len;
PFKEY_STAT_PUTREF();
}
if (m->m_len < sizeof(struct sadb_msg)) {
#if 1
m = m_pullup(m, sizeof(struct sadb_msg));
if (m == NULL) {
PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
return ENOBUFS;
}
#else
/* don't bother pulling it up just for stats */
#endif
}
if (m->m_len >= sizeof(struct sadb_msg)) {
struct sadb_msg *msg;
msg = mtod(m, struct sadb_msg *);
PFKEY_STATINC(PFKEY_STAT_IN_MSGTYPE + msg->sadb_msg_type);
}
LIST_FOREACH(rp, &rawcb_list, rcb_list)
{
struct socket * kso = rp->rcb_socket;
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, 0);
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) {
if (kso->so_rcv.sb_cc <= key_registered_sb_max)
sendup++;
else
printf("keysock: "
"registered sendup dropped, "
"sb_cc %ld max %d\n",
kso->so_rcv.sb_cc,
key_registered_sb_max);
}
break;
}
PFKEY_STATINC(PFKEY_STAT_IN_MSGTARGET + target);
if (!sendup)
continue;
if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
m_freem(m);
PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
return ENOBUFS;
}
if ((error = key_sendup0(rp, n, 0, 0)) != 0) {
m_freem(m);
return error;
}
n = NULL;
}
/* The 'later' time for processing the exact target has arrived */
if (so) {
error = key_sendup0(sotorawcb(so), m, 0, sbprio);
m = NULL;
} else {
error = 0;
m_freem(m);
}
return error;
}
static int
key_attach(struct socket *so, int proto)
{
struct keycb *kp;
int s, error;
KASSERT(sotorawcb(so) == NULL);
kp = kmem_zalloc(sizeof(*kp), KM_SLEEP);
kp->kp_raw.rcb_len = sizeof(*kp);
so->so_pcb = kp;
s = splsoftnet();
error = raw_attach(so, proto);
if (error) {
PFKEY_STATINC(PFKEY_STAT_SOCKERR);
kmem_free(kp, sizeof(*kp));
so->so_pcb = NULL;
goto out;
}
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;
out:
KASSERT(solocked(so));
splx(s);
return error;
}
static void
key_detach(struct socket *so)
{
struct keycb *kp = (struct keycb *)sotorawcb(so);
int s;
KASSERT(solocked(so));
KASSERT(kp != NULL);
s = splsoftnet();
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_detach(so);
splx(s);
}
static int
key_accept(struct socket *so, struct mbuf *nam)
{
KASSERT(solocked(so));
panic("key_accept");
return EOPNOTSUPP;
}
static int
key_bind(struct socket *so, struct mbuf *nam, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
key_listen(struct socket *so, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
key_connect(struct socket *so, struct mbuf *nam, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
key_connect2(struct socket *so, struct socket *so2)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
key_disconnect(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
int s;
KASSERT(solocked(so));
KASSERT(rp != NULL);
s = splsoftnet();
soisdisconnected(so);
raw_disconnect(rp);
splx(s);
return 0;
}
static int
key_shutdown(struct socket *so)
{
int s;
KASSERT(solocked(so));
/*
* Mark the connection as being incapable of further input.
*/
s = splsoftnet();
socantsendmore(so);
splx(s);
return 0;
}
static int
key_abort(struct socket *so)
{
KASSERT(solocked(so));
panic("key_abort");
return EOPNOTSUPP;
}
static int
key_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
{
return EOPNOTSUPP;
}
static int
key_stat(struct socket *so, struct stat *ub)
{
KASSERT(solocked(so));
return 0;
}
static int
key_peeraddr(struct socket *so, struct mbuf *nam)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(solocked(so));
KASSERT(rp != NULL);
KASSERT(nam != NULL);
if (rp->rcb_faddr == NULL)
return ENOTCONN;
raw_setpeeraddr(rp, nam);
return 0;
}
static int
key_sockaddr(struct socket *so, struct mbuf *nam)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(solocked(so));
KASSERT(rp != NULL);
KASSERT(nam != NULL);
if (rp->rcb_faddr == NULL)
return ENOTCONN;
raw_setsockaddr(rp, nam);
return 0;
}
static int
key_rcvd(struct socket *so, int flags, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
key_recvoob(struct socket *so, struct mbuf *m, int flags)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
key_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
struct mbuf *control, struct lwp *l)
{
int error = 0;
int s;
KASSERT(solocked(so));
s = splsoftnet();
error = raw_send(so, m, nam, control, l);
splx(s);
return error;
}
static int
key_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
{
KASSERT(solocked(so));
m_freem(m);
m_freem(control);
return EOPNOTSUPP;
}
static int
key_purgeif(struct socket *so, struct ifnet *ifa)
{
panic("key_purgeif");
return EOPNOTSUPP;
}
/*
* key_usrreq()
* derived from net/rtsock.c:route_usrreq()
*/
static int
key_usrreq(struct socket *so, int req,struct mbuf *m, struct mbuf *nam,
struct mbuf *control, struct lwp *l)
{
int s, error = 0;
KASSERT(req != PRU_ATTACH);
KASSERT(req != PRU_DETACH);
KASSERT(req != PRU_ACCEPT);
KASSERT(req != PRU_BIND);
KASSERT(req != PRU_LISTEN);
KASSERT(req != PRU_CONNECT);
KASSERT(req != PRU_CONNECT2);
KASSERT(req != PRU_DISCONNECT);
KASSERT(req != PRU_SHUTDOWN);
KASSERT(req != PRU_ABORT);
KASSERT(req != PRU_CONTROL);
KASSERT(req != PRU_SENSE);
KASSERT(req != PRU_PEERADDR);
KASSERT(req != PRU_SOCKADDR);
KASSERT(req != PRU_RCVD);
KASSERT(req != PRU_RCVOOB);
KASSERT(req != PRU_SEND);
KASSERT(req != PRU_SENDOOB);
KASSERT(req != PRU_PURGEIF);
s = splsoftnet();
error = raw_usrreq(so, req, m, nam, control, l);
m = control = NULL; /* reclaimed in raw_usrreq */
splx(s);
return error;
}
/*
* Definitions of protocols supported in the KEY domain.
*/
DOMAIN_DEFINE(keydomain);
PR_WRAP_USRREQS(key)
#define key_attach key_attach_wrapper
#define key_detach key_detach_wrapper
#define key_accept key_accept_wrapper
#define key_bind key_bind_wrapper
#define key_listen key_listen_wrapper
#define key_connect key_connect_wrapper
#define key_connect2 key_connect2_wrapper
#define key_disconnect key_disconnect_wrapper
#define key_shutdown key_shutdown_wrapper
#define key_abort key_abort_wrapper
#define key_ioctl key_ioctl_wrapper
#define key_stat key_stat_wrapper
#define key_peeraddr key_peeraddr_wrapper
#define key_sockaddr key_sockaddr_wrapper
#define key_rcvd key_rcvd_wrapper
#define key_recvoob key_recvoob_wrapper
#define key_send key_send_wrapper
#define key_sendoob key_sendoob_wrapper
#define key_purgeif key_purgeif_wrapper
#define key_usrreq key_usrreq_wrapper
const struct pr_usrreqs key_usrreqs = {
.pr_attach = key_attach,
.pr_detach = key_detach,
.pr_accept = key_accept,
.pr_bind = key_bind,
.pr_listen = key_listen,
.pr_connect = key_connect,
.pr_connect2 = key_connect2,
.pr_disconnect = key_disconnect,
.pr_shutdown = key_shutdown,
.pr_abort = key_abort,
.pr_ioctl = key_ioctl,
.pr_stat = key_stat,
.pr_peeraddr = key_peeraddr,
.pr_sockaddr = key_sockaddr,
.pr_rcvd = key_rcvd,
.pr_recvoob = key_recvoob,
.pr_send = key_send,
.pr_sendoob = key_sendoob,
.pr_purgeif = key_purgeif,
.pr_generic = key_usrreq,
};
const 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_usrreqs = &key_usrreqs,
.pr_init = raw_init,
}
};
struct domain keydomain = {
.dom_family = PF_KEY,
.dom_name = "key",
.dom_init = key_init,
.dom_protosw = keysw,
.dom_protoswNPROTOSW = &keysw[__arraycount(keysw)],
};
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