363 lines
8.2 KiB
C
363 lines
8.2 KiB
C
/* $NetBSD: keysock.c,v 1.18 2002/03/21 04:41:03 itojun Exp $ */
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/* $KAME: keysock.c,v 1.23 2000/09/22 08:26:33 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 1.18 2002/03/21 04:41:03 itojun Exp $");
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#include "opt_inet.h"
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/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/proc.h>
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#include <sys/queue.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 <netkey/keydb.h>
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#include <netkey/key.h>
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#include <netkey/keysock.h>
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#include <netkey/key_debug.h>
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#include <machine/stdarg.h>
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struct sockaddr key_dst = { 2, PF_KEY, };
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struct sockaddr key_src = { 2, PF_KEY, };
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static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
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struct pfkeystat pfkeystat;
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/*
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* key_usrreq()
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* derived from net/rtsock.c:route_usrreq()
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*/
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int
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key_usrreq(so, req, m, nam, control, p)
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struct socket *so;
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int req;
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struct mbuf *m, *nam, *control;
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struct proc *p;
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{
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int error = 0;
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struct keycb *kp = (struct keycb *)sotorawcb(so);
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int s;
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s = splsoftnet();
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if (req == PRU_ATTACH) {
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kp = (struct keycb *)malloc(sizeof(*kp), M_PCB, M_WAITOK);
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so->so_pcb = (caddr_t)kp;
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if (so->so_pcb)
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bzero(so->so_pcb, sizeof(*kp));
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}
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if (req == PRU_DETACH && kp) {
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int af = kp->kp_raw.rcb_proto.sp_protocol;
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if (af == 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);
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}
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error = raw_usrreq(so, req, m, nam, control, p);
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m = control = NULL; /* reclaimed in raw_usrreq */
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kp = (struct keycb *)sotorawcb(so);
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if (req == PRU_ATTACH && kp) {
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int af = kp->kp_raw.rcb_proto.sp_protocol;
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if (error) {
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pfkeystat.sockerr++;
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free((caddr_t)kp, M_PCB);
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so->so_pcb = (caddr_t) 0;
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splx(s);
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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 (af == 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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}
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splx(s);
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return(error);
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}
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/*
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* key_output()
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*/
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int
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#if __STDC__
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key_output(struct mbuf *m, ...)
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#else
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key_output(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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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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struct socket *so;
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va_list ap;
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va_start(ap, m);
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so = va_arg(ap, struct socket *);
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va_end(ap);
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if (m == 0)
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panic("key_output: NULL pointer was passed.\n");
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pfkeystat.out_total++;
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pfkeystat.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.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.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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if ((m->m_flags & M_PKTHDR) == 0)
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panic("key_output: not M_PKTHDR ??");
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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.out_msgtype[msg->sadb_msg_type]++;
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if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
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pfkeystat.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(rp, m, promisc)
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struct rawcb *rp;
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struct mbuf *m;
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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 && 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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pfkeystat.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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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.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.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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/* so can be NULL if target != KEY_SENDUP_ONE */
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int
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key_sendup_mbuf(so, m, target)
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struct socket *so;
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struct mbuf *m;
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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("key_sendup_mbuf: NULL pointer was passed.\n");
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pfkeystat.in_total++;
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pfkeystat.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.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.in_msgtype[msg->sadb_msg_type]++;
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}
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for (rp = rawcb.lh_first; rp; rp = rp->rcb_list.le_next)
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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.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.in_nomem++;
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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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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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return error;
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}
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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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{ SOCK_RAW, &keydomain, PF_KEY_V2, PR_ATOMIC|PR_ADDR,
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0, key_output, raw_ctlinput, 0,
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key_usrreq,
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raw_init, 0, 0, 0,
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key_sysctl,
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}
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};
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struct domain keydomain =
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{ PF_KEY, "key", key_init, 0, 0,
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keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
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