475ed81624
keysock now protects itself by its own mutex, which means that the rawcb list is protected by two different mutexes (keysock's one and softnet_lock for rtsock), of course it's useless. Fix the situation by having a discrete rawcb list for each.
775 lines
16 KiB
C
775 lines
16 KiB
C
/* $NetBSD: keysock.c,v 1.61 2017/09/25 01:56:22 ozaki-r Exp $ */
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/* $FreeBSD: src/sys/netipsec/keysock.c,v 1.3.2.1 2003/01/24 05:11:36 sam Exp $ */
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/* $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: keysock.c,v 1.61 2017/09/25 01:56:22 ozaki-r Exp $");
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/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/domain.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/kmem.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/cpu.h>
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#include <sys/syslog.h>
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#include <net/raw_cb.h>
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#include <net/route.h>
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#include <net/pfkeyv2.h>
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#include <netipsec/key.h>
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#include <netipsec/keysock.h>
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#include <netipsec/key_debug.h>
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#include <netipsec/ipsec_private.h>
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struct key_cb {
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int key_count;
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int any_count;
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};
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static struct key_cb key_cb;
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static struct sockaddr key_dst = {
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.sa_len = 2,
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.sa_family = PF_KEY,
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};
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static struct sockaddr key_src = {
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.sa_len = 2,
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.sa_family = PF_KEY,
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};
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static const struct protosw keysw[];
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static int key_sendup0(struct rawcb *, struct mbuf *, int, int);
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int key_registered_sb_max = (2048 * MHLEN); /* XXX arbitrary */
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static kmutex_t *key_so_mtx;
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static struct rawcbhead key_rawcb;
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void
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key_init_so(void)
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{
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key_so_mtx = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
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}
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static void
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key_pr_init(void)
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{
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LIST_INIT(&key_rawcb);
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}
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/*
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* key_output()
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*/
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static int
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key_output(struct mbuf *m, struct socket *so)
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{
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struct sadb_msg *msg;
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int len, error = 0;
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int s;
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KASSERT(m != NULL);
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{
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uint64_t *ps = PFKEY_STAT_GETREF();
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ps[PFKEY_STAT_OUT_TOTAL]++;
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ps[PFKEY_STAT_OUT_BYTES] += m->m_pkthdr.len;
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PFKEY_STAT_PUTREF();
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}
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len = m->m_pkthdr.len;
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if (len < sizeof(struct sadb_msg)) {
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PFKEY_STATINC(PFKEY_STAT_OUT_TOOSHORT);
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error = EINVAL;
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goto end;
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}
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if (m->m_len < sizeof(struct sadb_msg)) {
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if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
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PFKEY_STATINC(PFKEY_STAT_OUT_NOMEM);
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error = ENOBUFS;
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goto end;
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}
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}
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KASSERT((m->m_flags & M_PKTHDR) != 0);
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if (KEYDEBUG_ON(KEYDEBUG_KEY_DUMP))
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kdebug_mbuf(m);
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msg = mtod(m, struct sadb_msg *);
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PFKEY_STATINC(PFKEY_STAT_OUT_MSGTYPE + msg->sadb_msg_type);
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if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
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PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN);
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error = EINVAL;
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goto end;
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}
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/*XXX giant lock*/
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s = splsoftnet();
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error = key_parse(m, so);
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m = NULL;
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splx(s);
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end:
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if (m)
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m_freem(m);
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return error;
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}
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/*
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* send message to the socket.
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*/
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static int
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key_sendup0(
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struct rawcb *rp,
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struct mbuf *m,
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int promisc,
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int sbprio
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)
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{
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int error;
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int ok;
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if (promisc) {
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struct sadb_msg *pmsg;
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M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
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if (m && m->m_len < sizeof(struct sadb_msg))
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m = m_pullup(m, sizeof(struct sadb_msg));
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if (!m) {
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PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
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return ENOBUFS;
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}
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m->m_pkthdr.len += sizeof(*pmsg);
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pmsg = mtod(m, struct sadb_msg *);
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memset(pmsg, 0, sizeof(*pmsg));
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pmsg->sadb_msg_version = PF_KEY_V2;
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pmsg->sadb_msg_type = SADB_X_PROMISC;
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pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
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/* pid and seq? */
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PFKEY_STATINC(PFKEY_STAT_IN_MSGTYPE + pmsg->sadb_msg_type);
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}
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if (sbprio == 0)
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ok = sbappendaddr(&rp->rcb_socket->so_rcv,
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(struct sockaddr *)&key_src, m, NULL);
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else
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ok = sbappendaddrchain(&rp->rcb_socket->so_rcv,
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(struct sockaddr *)&key_src, m, sbprio);
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if (!ok) {
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log(LOG_WARNING,
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"%s: couldn't send PF_KEY message to the socket\n",
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__func__);
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PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
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m_freem(m);
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error = ENOBUFS;
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rp->rcb_socket->so_rcv.sb_overflowed++;
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} else
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error = 0;
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sorwakeup(rp->rcb_socket);
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return error;
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}
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/* XXX this interface should be obsoleted. */
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int
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key_sendup(struct socket *so, struct sadb_msg *msg, u_int len,
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int target) /*target of the resulting message*/
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{
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struct mbuf *m, *n, *mprev;
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int tlen;
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KASSERT(so != NULL);
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KASSERT(msg != NULL);
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if (KEYDEBUG_ON(KEYDEBUG_KEY_DUMP)) {
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printf("key_sendup: \n");
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kdebug_sadb(msg);
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}
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/*
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* we increment statistics here, just in case we have ENOBUFS
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* in this function.
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*/
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{
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uint64_t *ps = PFKEY_STAT_GETREF();
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ps[PFKEY_STAT_IN_TOTAL]++;
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ps[PFKEY_STAT_IN_BYTES] += len;
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ps[PFKEY_STAT_IN_MSGTYPE + msg->sadb_msg_type]++;
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PFKEY_STAT_PUTREF();
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}
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/*
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* Get mbuf chain whenever possible (not clusters),
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* to save socket buffer. We'll be generating many SADB_ACQUIRE
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* messages to listening key sockets. If we simply allocate clusters,
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* sbappendaddr() will raise ENOBUFS due to too little sbspace().
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* sbspace() computes # of actual data bytes AND mbuf region.
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*
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* TODO: SADB_ACQUIRE filters should be implemented.
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*/
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tlen = len;
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m = mprev = NULL;
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while (tlen > 0) {
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int mlen;
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if (tlen == len) {
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MGETHDR(n, M_DONTWAIT, MT_DATA);
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mlen = MHLEN;
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} else {
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MGET(n, M_DONTWAIT, MT_DATA);
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mlen = MLEN;
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}
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if (!n) {
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PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
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return ENOBUFS;
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}
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n->m_len = mlen;
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if (tlen >= MCLBYTES) { /*XXX better threshold? */
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MCLGET(n, M_DONTWAIT);
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if ((n->m_flags & M_EXT) == 0) {
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m_free(n);
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m_freem(m);
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PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
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return ENOBUFS;
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}
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n->m_len = MCLBYTES;
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}
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if (tlen < n->m_len)
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n->m_len = tlen;
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n->m_next = NULL;
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if (m == NULL)
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m = mprev = n;
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else {
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mprev->m_next = n;
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mprev = n;
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}
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tlen -= n->m_len;
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n = NULL;
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}
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m->m_pkthdr.len = len;
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m_reset_rcvif(m);
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m_copyback(m, 0, len, msg);
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/* avoid duplicated statistics */
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{
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uint64_t *ps = PFKEY_STAT_GETREF();
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ps[PFKEY_STAT_IN_TOTAL]--;
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ps[PFKEY_STAT_IN_BYTES] -= len;
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ps[PFKEY_STAT_IN_MSGTYPE + msg->sadb_msg_type]--;
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PFKEY_STAT_PUTREF();
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}
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return key_sendup_mbuf(so, m, target);
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}
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/* so can be NULL if target != KEY_SENDUP_ONE */
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static int
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_key_sendup_mbuf(struct socket *so, struct mbuf *m,
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int target/*, sbprio */)
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{
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struct mbuf *n;
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struct keycb *kp;
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int sendup;
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struct rawcb *rp;
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int error = 0;
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int sbprio = 0; /* XXX should be a parameter */
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KASSERT(m != NULL);
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KASSERT(so != NULL || target != KEY_SENDUP_ONE);
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/*
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* RFC 2367 says ACQUIRE and other kernel-generated messages
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* are special. We treat all KEY_SENDUP_REGISTERED messages
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* as special, delivering them to all registered sockets
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* even if the socket is at or above its so->so_rcv.sb_max limits.
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* The only constraint is that the so_rcv data fall below
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* key_registered_sb_max.
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* Doing that check here avoids reworking every key_sendup_mbuf()
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* in the short term. . The rework will be done after a technical
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* conensus that this approach is appropriate.
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*/
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if (target == KEY_SENDUP_REGISTERED) {
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sbprio = SB_PRIO_BESTEFFORT;
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}
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{
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uint64_t *ps = PFKEY_STAT_GETREF();
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ps[PFKEY_STAT_IN_TOTAL]++;
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ps[PFKEY_STAT_IN_BYTES] += m->m_pkthdr.len;
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PFKEY_STAT_PUTREF();
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}
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if (m->m_len < sizeof(struct sadb_msg)) {
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#if 1
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m = m_pullup(m, sizeof(struct sadb_msg));
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if (m == NULL) {
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PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
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return ENOBUFS;
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}
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#else
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/* don't bother pulling it up just for stats */
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#endif
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}
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if (m->m_len >= sizeof(struct sadb_msg)) {
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struct sadb_msg *msg;
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msg = mtod(m, struct sadb_msg *);
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PFKEY_STATINC(PFKEY_STAT_IN_MSGTYPE + msg->sadb_msg_type);
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}
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LIST_FOREACH(rp, &key_rawcb, rcb_list)
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{
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struct socket * kso = rp->rcb_socket;
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if (rp->rcb_proto.sp_family != PF_KEY)
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continue;
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if (rp->rcb_proto.sp_protocol
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&& rp->rcb_proto.sp_protocol != PF_KEY_V2) {
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continue;
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}
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kp = (struct keycb *)rp;
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/*
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* If you are in promiscuous mode, and when you get broadcasted
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* reply, you'll get two PF_KEY messages.
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* (based on pf_key@inner.net message on 14 Oct 1998)
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*/
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if (((struct keycb *)rp)->kp_promisc) {
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if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
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(void)key_sendup0(rp, n, 1, 0);
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n = NULL;
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}
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}
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/* the exact target will be processed later */
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if (so && sotorawcb(so) == rp)
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continue;
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sendup = 0;
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switch (target) {
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case KEY_SENDUP_ONE:
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/* the statement has no effect */
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if (so && sotorawcb(so) == rp)
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sendup++;
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break;
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case KEY_SENDUP_ALL:
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sendup++;
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break;
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case KEY_SENDUP_REGISTERED:
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if (kp->kp_registered) {
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if (kso->so_rcv.sb_cc <= key_registered_sb_max)
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sendup++;
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else
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printf("keysock: "
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"registered sendup dropped, "
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"sb_cc %ld max %d\n",
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kso->so_rcv.sb_cc,
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key_registered_sb_max);
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}
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break;
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}
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PFKEY_STATINC(PFKEY_STAT_IN_MSGTARGET + target);
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if (!sendup)
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continue;
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if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
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m_freem(m);
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PFKEY_STATINC(PFKEY_STAT_IN_NOMEM);
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return ENOBUFS;
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}
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if ((error = key_sendup0(rp, n, 0, 0)) != 0) {
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m_freem(m);
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return error;
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}
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n = NULL;
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}
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/* The 'later' time for processing the exact target has arrived */
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if (so) {
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error = key_sendup0(sotorawcb(so), m, 0, sbprio);
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m = NULL;
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} else {
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error = 0;
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m_freem(m);
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}
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return error;
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}
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|
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int
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key_sendup_mbuf(struct socket *so, struct mbuf *m,
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int target/*, sbprio */)
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{
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int error;
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if (so == NULL)
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mutex_enter(key_so_mtx);
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else
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KASSERT(solocked(so));
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error = _key_sendup_mbuf(so, m, target);
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if (so == NULL)
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mutex_exit(key_so_mtx);
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return error;
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}
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|
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static int
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key_attach(struct socket *so, int proto)
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{
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struct keycb *kp;
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int s, error;
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KASSERT(sotorawcb(so) == NULL);
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kp = kmem_zalloc(sizeof(*kp), KM_SLEEP);
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kp->kp_raw.rcb_len = sizeof(*kp);
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so->so_pcb = kp;
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s = splsoftnet();
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KASSERT(so->so_lock == NULL);
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mutex_obj_hold(key_so_mtx);
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so->so_lock = key_so_mtx;
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solock(so);
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error = raw_attach(so, proto, &key_rawcb);
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if (error) {
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PFKEY_STATINC(PFKEY_STAT_SOCKERR);
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kmem_free(kp, sizeof(*kp));
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so->so_pcb = NULL;
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goto out;
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}
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kp->kp_promisc = kp->kp_registered = 0;
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if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
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key_cb.key_count++;
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key_cb.any_count++;
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kp->kp_raw.rcb_laddr = &key_src;
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kp->kp_raw.rcb_faddr = &key_dst;
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soisconnected(so);
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so->so_options |= SO_USELOOPBACK;
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out:
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KASSERT(solocked(so));
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splx(s);
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return error;
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}
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static void
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key_detach(struct socket *so)
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{
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struct keycb *kp = (struct keycb *)sotorawcb(so);
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int s;
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KASSERT(!cpu_softintr_p());
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KASSERT(solocked(so));
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KASSERT(kp != NULL);
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s = splsoftnet();
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if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
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key_cb.key_count--;
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key_cb.any_count--;
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|
key_freereg(so);
|
|
raw_detach(so);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
key_accept(struct socket *so, struct sockaddr *nam)
|
|
{
|
|
KASSERT(solocked(so));
|
|
|
|
panic("key_accept");
|
|
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
static int
|
|
key_bind(struct socket *so, struct sockaddr *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 sockaddr *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 sockaddr *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 sockaddr *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 sockaddr *nam,
|
|
struct mbuf *control, struct lwp *l)
|
|
{
|
|
int error = 0;
|
|
int s;
|
|
|
|
KASSERT(solocked(so));
|
|
KASSERT(so->so_proto == &keysw[0]);
|
|
|
|
s = splsoftnet();
|
|
error = raw_send(so, m, nam, control, l, &key_output);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
static 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,
|
|
};
|
|
|
|
static const struct protosw keysw[] = {
|
|
{
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &keydomain,
|
|
.pr_protocol = PF_KEY_V2,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_ctlinput = raw_ctlinput,
|
|
.pr_usrreqs = &key_usrreqs,
|
|
.pr_init = key_pr_init,
|
|
}
|
|
};
|
|
|
|
struct domain keydomain = {
|
|
.dom_family = PF_KEY,
|
|
.dom_name = "key",
|
|
.dom_init = key_init,
|
|
.dom_protosw = keysw,
|
|
.dom_protoswNPROTOSW = &keysw[__arraycount(keysw)],
|
|
};
|