467 lines
10 KiB
C
467 lines
10 KiB
C
/* $NetBSD: keysock.c,v 1.44 2007/03/04 06:03:35 christos Exp $ */
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/* $KAME: keysock.c,v 1.32 2003/08/22 05:45:08 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 1.44 2007/03/04 06:03:35 christos 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 <netinet/in.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 = { .sa_len = 2, .sa_family = PF_KEY, };
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struct sockaddr key_src = { .sa_len = 2, .sa_family = PF_KEY, };
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struct pfkeystat pfkeystat;
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static int key_receive __P((struct socket *, struct mbuf **, struct uio *,
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struct mbuf **, struct mbuf **, int *));
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static int key_sendup0 __P((struct rawcb *, struct mbuf *, int, int));
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static int
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key_receive(struct socket *so, struct mbuf **paddr, struct uio *uio,
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struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
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{
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struct rawcb *rp = sotorawcb(so);
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struct keycb *kp = (struct keycb *)rp;
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int error;
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int s;
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error = (*kp->kp_receive)(so, paddr, uio, mp0, controlp, flagsp);
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/*
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* now we might have enough receive buffer space.
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* pull packets from kp_queue as many as possible.
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*/
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s = splsoftnet();
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while (/*CONSTCOND*/ 1) {
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struct mbuf *m;
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m = kp->kp_queue;
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if (m == NULL || sbspace(&so->so_rcv) < m->m_pkthdr.len)
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break;
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kp->kp_queue = m->m_nextpkt;
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m->m_nextpkt = NULL; /* safety */
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if (key_sendup0(rp, m, 0, 1))
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break;
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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_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, l)
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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 lwp *l;
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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,
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M_WAITOK|M_ZERO);
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so->so_pcb = (void *)kp;
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kp->kp_receive = so->so_receive;
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so->so_receive = key_receive;
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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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struct mbuf *n;
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if (af == PF_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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while (kp->kp_queue) {
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n = kp->kp_queue->m_nextpkt;
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kp->kp_queue->m_nextpkt = NULL;
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m_freem(kp->kp_queue);
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kp->kp_queue = n;
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}
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}
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error = raw_usrreq(so, req, m, nam, control, l);
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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((void *)kp, M_PCB);
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so->so_pcb = (void *) 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)
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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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key_output(struct mbuf *m, ...)
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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.");
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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, canwait)
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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 canwait;
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{
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struct keycb *kp = (struct keycb *)rp;
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struct mbuf *n;
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int error = 0;
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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 (canwait) {
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if (kp->kp_queue) {
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for (n = kp->kp_queue; n && n->m_nextpkt;
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n = n->m_nextpkt)
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;
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n->m_nextpkt = m;
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m = kp->kp_queue;
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kp->kp_queue = NULL;
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} else
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m->m_nextpkt = NULL; /* just for safety */
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} else
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m->m_nextpkt = NULL;
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for (; m && error == 0; m = n) {
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n = m->m_nextpkt;
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if (canwait &&
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sbspace(&rp->rcb_socket->so_rcv) < m->m_pkthdr.len) {
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error = EAGAIN;
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goto recovery;
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}
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m->m_nextpkt = NULL;
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if (!sbappendaddr(&rp->rcb_socket->so_rcv,
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(struct sockaddr *)&key_src, m, NULL)) {
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pfkeystat.in_nomem++;
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error = ENOBUFS;
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goto recovery;
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} else {
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sorwakeup(rp->rcb_socket);
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error = 0;
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}
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}
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return (error);
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recovery:
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if (kp->kp_queue) {
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/*
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* kp_queue != NULL implies !canwait.
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*/
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KASSERT(!canwait);
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KASSERT(m->m_nextpkt == NULL);
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/*
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* insert m to the head of queue, as normally mbuf on the queue
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* is less important than others.
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*/
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if (m) {
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m->m_nextpkt = kp->kp_queue;
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kp->kp_queue = m;
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}
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} else {
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/* recover the queue */
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if (!m) {
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/* first ENOBUFS case */
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kp->kp_queue = n;
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} else {
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kp->kp_queue = m;
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m->m_nextpkt = n;
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}
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}
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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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int canwait;
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if (m == NULL)
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panic("key_sendup_mbuf: NULL pointer was passed.");
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if (so == NULL && target == KEY_SENDUP_ONE)
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panic("key_sendup_mbuf: NULL pointer was passed.");
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canwait = target & KEY_SENDUP_CANWAIT;
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target &= ~KEY_SENDUP_CANWAIT;
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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, canwait);
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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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/*
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* ignore error even if queue is full. PF_KEY does not
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* guarantee the delivery of the message.
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* this is important when target == KEY_SENDUP_ALL.
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*/
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key_sendup0(rp, n, 0, canwait);
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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, canwait);
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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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DOMAIN_DEFINE(keydomain);
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const 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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}
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};
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struct domain keydomain = {
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.dom_family = PF_KEY,
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.dom_name = "key",
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.dom_init = key_init,
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.dom_protosw = keysw,
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.dom_protoswNPROTOSW = &keysw[sizeof(keysw)/sizeof(keysw[0])],
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};
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