571 lines
12 KiB
C
571 lines
12 KiB
C
/* $FreeBSD$ */
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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 "opt_ipsec.h"
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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/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/priv.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 <net/if.h>
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#include <net/vnet.h>
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#include <net/raw_cb.h>
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#include <netinet/in.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.h>
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#include <machine/stdarg.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 VNET_DEFINE(struct key_cb, key_cb);
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#define V_key_cb VNET(key_cb)
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static struct sockaddr key_src = { 2, PF_KEY, };
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static int key_sendup0(struct rawcb *, struct mbuf *, int);
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VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
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VNET_PCPUSTAT_SYSINIT(pfkeystat);
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#ifdef VIMAGE
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VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
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#endif /* VIMAGE */
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/*
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* key_output()
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*/
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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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if (m == 0)
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panic("%s: NULL pointer was passed.\n", __func__);
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PFKEYSTAT_INC(out_total);
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PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
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len = m->m_pkthdr.len;
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if (len < sizeof(struct sadb_msg)) {
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PFKEYSTAT_INC(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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PFKEYSTAT_INC(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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M_ASSERTPKTHDR(m);
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KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
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msg = mtod(m, struct sadb_msg *);
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PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
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if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
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PFKEYSTAT_INC(out_invlen);
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error = EINVAL;
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goto end;
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}
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error = key_parse(m, so);
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m = NULL;
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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(struct rawcb *rp, struct mbuf *m, int promisc)
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{
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int error;
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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_NOWAIT);
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if (m == NULL) {
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PFKEYSTAT_INC(in_nomem);
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return (ENOBUFS);
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}
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pmsg = mtod(m, struct sadb_msg *);
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bzero(pmsg, 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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PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]);
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}
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if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
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m, NULL)) {
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PFKEYSTAT_INC(in_nomem);
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m_freem(m);
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error = ENOBUFS;
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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, int target)
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{
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struct mbuf *m, *n, *mprev;
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int tlen;
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/* sanity check */
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if (so == 0 || msg == 0)
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panic("%s: NULL pointer was passed.\n", __func__);
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KEYDEBUG(KEYDEBUG_KEY_DUMP,
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printf("%s: \n", __func__);
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kdebug_sadb(msg));
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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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PFKEYSTAT_INC(in_total);
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PFKEYSTAT_ADD(in_bytes, len);
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PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
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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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if (tlen == len) {
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MGETHDR(n, M_NOWAIT, MT_DATA);
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if (n == NULL) {
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PFKEYSTAT_INC(in_nomem);
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return ENOBUFS;
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}
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n->m_len = MHLEN;
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} else {
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MGET(n, M_NOWAIT, MT_DATA);
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if (n == NULL) {
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PFKEYSTAT_INC(in_nomem);
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return ENOBUFS;
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}
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n->m_len = MLEN;
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}
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if (tlen >= MCLBYTES) { /*XXX better threshold? */
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if (!(MCLGET(n, M_NOWAIT))) {
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m_free(n);
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m_freem(m);
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PFKEYSTAT_INC(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->m_pkthdr.rcvif = NULL;
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m_copyback(m, 0, len, (caddr_t)msg);
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/* avoid duplicated statistics */
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PFKEYSTAT_ADD(in_total, -1);
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PFKEYSTAT_ADD(in_bytes, -len);
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PFKEYSTAT_ADD(in_msgtype[msg->sadb_msg_type], -1);
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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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int
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key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
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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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if (m == NULL)
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panic("key_sendup_mbuf: NULL pointer was passed.\n");
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if (so == NULL && target == KEY_SENDUP_ONE)
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panic("%s: NULL pointer was passed.\n", __func__);
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PFKEYSTAT_INC(in_total);
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PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
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if (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 == NULL) {
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PFKEYSTAT_INC(in_nomem);
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return ENOBUFS;
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}
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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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PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
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}
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mtx_lock(&rawcb_mtx);
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LIST_FOREACH(rp, &V_rawcb_list, list)
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{
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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);
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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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sendup++;
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break;
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}
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PFKEYSTAT_INC(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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PFKEYSTAT_INC(in_nomem);
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mtx_unlock(&rawcb_mtx);
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return ENOBUFS;
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}
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if ((error = key_sendup0(rp, n, 0)) != 0) {
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m_freem(m);
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mtx_unlock(&rawcb_mtx);
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return error;
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}
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n = NULL;
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}
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if (so) {
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error = key_sendup0(sotorawcb(so), m, 0);
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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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mtx_unlock(&rawcb_mtx);
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return error;
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}
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/*
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* key_abort()
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* derived from net/rtsock.c:rts_abort()
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*/
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static void
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key_abort(struct socket *so)
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{
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raw_usrreqs.pru_abort(so);
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}
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/*
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* key_attach()
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* derived from net/rtsock.c:rts_attach()
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*/
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static int
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key_attach(struct socket *so, int proto, struct thread *td)
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{
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struct keycb *kp;
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int error;
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KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
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if (td != NULL) {
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error = priv_check(td, PRIV_NET_RAW);
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if (error)
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return error;
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}
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/* XXX */
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kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO);
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if (kp == 0)
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return ENOBUFS;
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so->so_pcb = (caddr_t)kp;
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error = raw_attach(so, proto);
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kp = (struct keycb *)sotorawcb(so);
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if (error) {
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free(kp, M_PCB);
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so->so_pcb = (caddr_t) 0;
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return error;
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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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V_key_cb.key_count++;
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V_key_cb.any_count++;
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soisconnected(so);
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so->so_options |= SO_USELOOPBACK;
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return 0;
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}
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/*
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* key_bind()
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* derived from net/rtsock.c:rts_bind()
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*/
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static int
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key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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return EINVAL;
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}
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/*
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* key_close()
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* derived from net/rtsock.c:rts_close().
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*/
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static void
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key_close(struct socket *so)
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{
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raw_usrreqs.pru_close(so);
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}
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/*
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* key_connect()
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* derived from net/rtsock.c:rts_connect()
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*/
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static int
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key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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return EINVAL;
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}
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/*
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* key_detach()
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* derived from net/rtsock.c:rts_detach()
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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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KASSERT(kp != NULL, ("key_detach: kp == NULL"));
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if (kp->kp_raw.rcb_proto.sp_protocol
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== PF_KEY) /* XXX: AF_KEY */
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V_key_cb.key_count--;
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V_key_cb.any_count--;
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key_freereg(so);
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raw_usrreqs.pru_detach(so);
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}
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/*
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* key_disconnect()
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* derived from net/rtsock.c:key_disconnect()
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*/
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static int
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key_disconnect(struct socket *so)
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{
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return(raw_usrreqs.pru_disconnect(so));
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}
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/*
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* key_peeraddr()
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* derived from net/rtsock.c:rts_peeraddr()
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*/
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static int
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key_peeraddr(struct socket *so, struct sockaddr **nam)
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{
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return(raw_usrreqs.pru_peeraddr(so, nam));
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}
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/*
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* key_send()
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* derived from net/rtsock.c:rts_send()
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*/
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static int
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key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
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struct mbuf *control, struct thread *td)
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{
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return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
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}
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/*
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* key_shutdown()
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* derived from net/rtsock.c:rts_shutdown()
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*/
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static int
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key_shutdown(struct socket *so)
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{
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return(raw_usrreqs.pru_shutdown(so));
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}
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/*
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* key_sockaddr()
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* derived from net/rtsock.c:rts_sockaddr()
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*/
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static int
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key_sockaddr(struct socket *so, struct sockaddr **nam)
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{
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return(raw_usrreqs.pru_sockaddr(so, nam));
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}
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struct pr_usrreqs key_usrreqs = {
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.pru_abort = key_abort,
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.pru_attach = key_attach,
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.pru_bind = key_bind,
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.pru_connect = key_connect,
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.pru_detach = key_detach,
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.pru_disconnect = key_disconnect,
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.pru_peeraddr = key_peeraddr,
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.pru_send = key_send,
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.pru_shutdown = key_shutdown,
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.pru_sockaddr = key_sockaddr,
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.pru_close = key_close,
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};
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/* sysctl */
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SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
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/*
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* Definitions of protocols supported in the KEY domain.
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*/
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extern struct domain keydomain;
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struct protosw keysw[] = {
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{
|
|
.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
|
|
}
|
|
};
|
|
|
|
static void
|
|
key_init0(void)
|
|
{
|
|
|
|
bzero((caddr_t)&V_key_cb, sizeof(V_key_cb));
|
|
key_init();
|
|
}
|
|
|
|
struct domain keydomain = {
|
|
.dom_family = PF_KEY,
|
|
.dom_name = "key",
|
|
.dom_init = key_init0,
|
|
#ifdef VIMAGE
|
|
.dom_destroy = key_destroy,
|
|
#endif
|
|
.dom_protosw = keysw,
|
|
.dom_protoswNPROTOSW = &keysw[sizeof(keysw)/sizeof(keysw[0])]
|
|
};
|
|
|
|
VNET_DOMAIN_SET(key);
|