IPSEC support in the kernel.

pr_input() routines prototype is also changed to support IPSEC and IPV6
chained protocol headers.

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project

1 files changed, 542 insertions, 0 deletions

diff --git a/sys/netkey/keysock.c b/sys/netkey/keysock.c
new file mode 100644
index 000000000000..b3c8652ec786
--- /dev/null
+++ b/sys/netkey/keysock.c
@@ -0,0 +1,542 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/* KAME @(#)$Id: keysock.c,v 1.2 1999/08/16 19:30:36 shin Exp $ */
+
+/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
+
+#include <opt_ipsec.h>
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+#include <sys/mbuf.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/domain.h>
+#include <sys/protosw.h>
+#include <sys/errno.h>
+
+#include <machine/ipl.h>
+
+#include <net/raw_cb.h>
+#include <net/route.h>
+
+#include <net/pfkeyv2.h>
+#include <netkey/keydb.h>
+#include <netkey/key.h>
+#include <netkey/keysock.h>
+#ifdef IPSEC_DEBUG
+#include <netkey/key_debug.h>
+#else
+#define	KEYDEBUG(lev,arg)
+#endif
+
+#include <machine/stdarg.h>
+
+static MALLOC_DEFINE(M_SECA, "key mgmt",
+		     "security associations, key management");
+
+struct sockaddr key_dst = { 2, PF_KEY, };
+struct sockaddr key_src = { 2, PF_KEY, };
+struct sockproto key_proto = { PF_KEY, PF_KEY_V2 };
+
+static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
+
+#define	KMALLOC(p, t, n) \
+	((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT))
+#define	KFREE(p) \
+	free((caddr_t)(p), M_SECA);
+
+/*
+ * key_abort()
+ * derived from net/rtsock.c:rts_abort()
+ */
+static int
+key_abort(struct socket *so)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_abort(so);
+	splx(s);
+	return error;
+}
+
+/*
+ * key_attach()
+ * derived from net/rtsock.c:rts_attach()
+ */
+static int
+key_attach(struct socket *so, int proto, struct proc *p)
+{
+	struct keycb *kp;
+	int s, error;
+
+	if (sotorawcb(so) != 0)
+		return EISCONN;	/* XXX panic? */
+	MALLOC(kp, struct keycb *, sizeof *kp, M_PCB, M_WAITOK); /* XXX */
+	if (kp == 0)
+		return ENOBUFS;
+	bzero(kp, sizeof *kp);
+
+	/*
+	 * The splnet() is necessary to block protocols from sending
+	 * error notifications (like RTM_REDIRECT or RTM_LOSING) while
+	 * this PCB is extant but incompletely initialized.
+	 * Probably we should try to do more of this work beforehand and
+	 * eliminate the spl.
+	 */
+	s = splnet();
+	so->so_pcb = (caddr_t)kp;
+	error = raw_usrreqs.pru_attach(so, proto, p);
+	kp = (struct keycb *)sotorawcb(so);
+	if (error) {
+		free(kp, M_PCB);
+		so->so_pcb = (caddr_t) 0;
+		splx(s);
+		printf("key_usrreq: key_usrreq results %d\n", error);
+		return error;
+	}
+
+	kp->kp_promisc = kp->kp_registered = 0;
+
+	if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
+		key_cb.key_count++;
+	key_cb.any_count++;
+	kp->kp_raw.rcb_laddr = &key_src;
+	kp->kp_raw.rcb_faddr = &key_dst;
+	soisconnected(so);
+	so->so_options |= SO_USELOOPBACK;
+
+	splx(s);
+	return 0;
+}
+
+/*
+ * key_bind()
+ * derived from net/rtsock.c:rts_bind()
+ */
+static int
+key_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_bind(so, nam, p); /* xxx just EINVAL */
+	splx(s);
+	return error;
+}
+
+/*
+ * key_connect()
+ * derived from net/rtsock.c:rts_connect()
+ */
+static int
+key_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_connect(so, nam, p); /* XXX just EINVAL */
+	splx(s);
+	return error;
+}
+
+/*
+ * key_detach()
+ * derived from net/rtsock.c:rts_detach()
+ */
+static int
+key_detach(struct socket *so)
+{
+	struct keycb *kp = (struct keycb *)sotorawcb(so);
+	int s, error;
+
+	s = splnet();
+	if (kp != 0) {
+		if (kp->kp_raw.rcb_proto.sp_protocol
+		    == PF_KEY) /* XXX: AF_KEY */
+			key_cb.key_count--;
+		key_cb.any_count--;
+
+		key_freereg(so);
+	}
+	error = raw_usrreqs.pru_detach(so);
+	splx(s);
+	return error;
+}
+
+/*
+ * key_disconnect()
+ * derived from net/rtsock.c:key_disconnect()
+ */
+static int
+key_disconnect(struct socket *so)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_disconnect(so);
+	splx(s);
+	return error;
+}
+
+/*
+ * key_peeraddr()
+ * derived from net/rtsock.c:rts_peeraddr()
+ */
+static int
+key_peeraddr(struct socket *so, struct sockaddr **nam)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_peeraddr(so, nam);
+	splx(s);
+	return error;
+}
+
+/*
+ * key_send()
+ * derived from net/rtsock.c:rts_send()
+ */
+static int
+key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
+	 struct mbuf *control, struct proc *p)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_send(so, flags, m, nam, control, p);
+	splx(s);
+	return error;
+}
+
+/*
+ * key_shutdown()
+ * derived from net/rtsock.c:rts_shutdown()
+ */
+static int
+key_shutdown(struct socket *so)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_shutdown(so);
+	splx(s);
+	return error;
+}
+
+/*
+ * key_sockaddr()
+ * derived from net/rtsock.c:rts_sockaddr()
+ */
+static int
+key_sockaddr(struct socket *so, struct sockaddr **nam)
+{
+	int s, error;
+	s = splnet();
+	error = raw_usrreqs.pru_sockaddr(so, nam);
+	splx(s);
+	return error;
+}
+
+struct pr_usrreqs key_usrreqs = {
+	key_abort, pru_accept_notsupp, key_attach, key_bind,
+	key_connect,
+	pru_connect2_notsupp, pru_control_notsupp, key_detach,
+	key_disconnect, pru_listen_notsupp, key_peeraddr,
+	pru_rcvd_notsupp,
+	pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
+	key_sockaddr, sosend, soreceive, sopoll
+};
+
+/*
+ * key_output()
+ */
+int
+key_output(struct mbuf *m, struct socket *so)
+{
+	struct sadb_msg *msg = NULL;
+	int len, error = 0;
+	int s;
+	int target;
+
+	if (m == 0)
+		panic("key_output: NULL pointer was passed.\n");
+
+	if (m->m_len < sizeof(long)
+	 && (m = m_pullup(m, 8)) == 0) {
+		printf("key_output: can't pullup mbuf\n");
+		error = ENOBUFS;
+		goto end;
+	}
+
+	if ((m->m_flags & M_PKTHDR) == 0)
+		panic("key_output: not M_PKTHDR ??");
+
+#if defined(IPSEC_DEBUG)
+	KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
+#endif /* defined(IPSEC_DEBUG) */
+
+	len = m->m_pkthdr.len;
+	if (len < sizeof(struct sadb_msg)
+	 || len != PFKEY_UNUNIT64(mtod(m, struct sadb_msg *)->sadb_msg_len)) {
+		printf("key_output: Invalid message length.\n");
+		error = EINVAL;
+		goto end;
+	}
+
+	/*
+	 * allocate memory for sadb_msg, and copy to sadb_msg from mbuf
+	 * XXX: To be processed directly without a copy.
+	 */
+	KMALLOC(msg, struct sadb_msg *, len);
+	if (msg == 0) {
+		printf("key_output: No more memory.\n");
+		error = ENOBUFS;
+		goto end;
+		/* or do panic ? */
+	}
+	m_copydata(m, 0, len, (caddr_t)msg);
+
+	/*XXX giant lock*/
+	s = splnet();
+	if ((len = key_parse(&msg, so, &target)) == 0) {
+		/* discard. i.e. no need to reply. */
+		error = 0;
+		splx(s);
+		goto end;
+	}
+
+	/* send up message to the socket */
+	error = key_sendup(so, msg, len, target);
+	splx(s);
+	KFREE(msg);
+end:
+	m_freem(m);
+	return (error);
+}
+
+/*
+ * send message to the socket.
+ */
+static int
+key_sendup0(rp, m, promisc)
+	struct rawcb *rp;
+	struct mbuf *m;
+	int promisc;
+{
+	if (promisc) {
+		struct sadb_msg *pmsg;
+
+		M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
+		if (m && m->m_len < sizeof(struct sadb_msg))
+			m = m_pullup(m, sizeof(struct sadb_msg));
+		if (!m) {
+			printf("key_sendup0: cannot pullup\n");
+			m_freem(m);
+			return ENOBUFS;
+		}
+		m->m_pkthdr.len += sizeof(*pmsg);
+
+		pmsg = mtod(m, struct sadb_msg *);
+		bzero(pmsg, sizeof(*pmsg));
+		pmsg->sadb_msg_version = PF_KEY_V2;
+		pmsg->sadb_msg_type = SADB_X_PROMISC;
+		pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
+		/* pid and seq? */
+	}
+
+	if (!sbappendaddr(&rp->rcb_socket->so_rcv,
+			(struct sockaddr *)&key_src, m, NULL)) {
+		printf("key_sendup0: sbappendaddr failed\n");
+		m_freem(m);
+		return ENOBUFS;
+	}
+	sorwakeup(rp->rcb_socket);
+	return 0;
+}
+
+int
+key_sendup(so, msg, len, target)
+	struct socket *so;
+	struct sadb_msg *msg;
+	u_int len;
+	int target;	/*target of the resulting message*/
+{
+	struct mbuf *m, *n, *mprev;
+	struct keycb *kp;
+	int sendup;
+	struct rawcb *rp;
+	int error;
+	int tlen;
+
+	/* sanity check */
+	if (so == 0 || msg == 0)
+		panic("key_sendup: NULL pointer was passed.\n");
+
+	KEYDEBUG(KEYDEBUG_KEY_DUMP,
+		printf("key_sendup: \n");
+		kdebug_sadb(msg));
+
+	/*
+	 * Get mbuf chain whenever possible (not clusters),
+	 * to save socket buffer.  We'll be generating many SADB_ACQUIRE
+	 * messages to listening key sockets.  If we simmply allocate clusters,
+	 * sbappendaddr() will raise ENOBUFS due to too little sbspace().
+	 * sbspace() computes # of actual data bytes AND mbuf region.
+	 *
+	 * TODO: SADB_ACQUIRE filters should be implemented.
+	 */
+	tlen = len;
+	m = mprev = NULL;
+	while (tlen > 0) {
+		if (tlen == len) {
+			MGETHDR(n, M_DONTWAIT, MT_DATA);
+			n->m_len = MHLEN;
+		} else {
+			MGET(n, M_DONTWAIT, MT_DATA);
+			n->m_len = MLEN;
+		}
+		if (!n)
+			return ENOBUFS;
+		if (tlen > MCLBYTES) {	/*XXX better threshold? */
+			MCLGET(n, M_DONTWAIT);
+			if ((n->m_flags & M_EXT) == 0) {
+				m_free(n);
+				m_freem(m);
+				return ENOBUFS;
+			}
+			n->m_len = MCLBYTES;
+		}
+
+		if (tlen < n->m_len)
+			n->m_len = tlen;
+		n->m_next = NULL;
+		if (m == NULL)
+			m = mprev = n;
+		else {
+			mprev->m_next = n;
+			mprev = n;
+		}
+		tlen -= n->m_len;
+		n = NULL;
+	}
+	m->m_pkthdr.len = len;
+	m->m_pkthdr.rcvif = NULL;
+	m_copyback(m, 0, len, (caddr_t)msg);
+
+	LIST_FOREACH(rp, &rawcb_list, list)
+	{
+		if (rp->rcb_proto.sp_family != PF_KEY)
+			continue;
+		if (rp->rcb_proto.sp_protocol
+		 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
+			continue;
+		}
+
+		kp = (struct keycb *)rp;
+
+		/*
+		 * If you are in promiscuous mode, and when you get broadcasted
+		 * reply, you'll get two PF_KEY messages.
+		 * (based on pf_key@inner.net message on 14 Oct 1998)
+		 */
+		if (((struct keycb *)rp)->kp_promisc) {
+			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
+				(void)key_sendup0(rp, n, 1);
+				n = NULL;
+			}
+		}
+
+		/* the exact target will be processed later */
+		if (sotorawcb(so) == rp)
+			continue;
+
+		sendup = 0;
+		switch (target) {
+		case KEY_SENDUP_ONE:
+			/* the statement has no effect */
+			if (sotorawcb(so) == rp)
+				sendup++;
+			break;
+		case KEY_SENDUP_ALL:
+			sendup++;
+			break;
+		case KEY_SENDUP_REGISTERED:
+			if (kp->kp_registered)
+				sendup++;
+			break;
+		}
+
+		if (!sendup)
+			continue;
+
+		if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
+			printf("key_sendup: m_copy fail\n");
+			m_freem(m);
+			return ENOBUFS;
+		}
+
+		if ((error = key_sendup0(rp, n, 0)) != 0) {
+			m_freem(m);
+			return error;
+		}
+
+		n = NULL;
+	}
+
+	error = key_sendup0(sotorawcb(so), m, 0);
+	m = NULL;
+	return error;
+}
+
+/* sysctl */
+SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
+
+/*
+ * Definitions of protocols supported in the KEY domain.
+ */
+
+extern struct domain keydomain;
+
+struct protosw keysw[] = {
+{ SOCK_RAW,	&keydomain,	PF_KEY_V2,	PR_ATOMIC|PR_ADDR,
+  0,		key_output,	raw_ctlinput,	0,
+  0,
+  raw_init,	0,		0,		0,
+  &key_usrreqs
+}
+};
+
+struct domain keydomain =
+    { PF_KEY, "key", key_init, 0, 0,
+      keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
+
+DOMAIN_SET(key);