1 files changed, 608 insertions, 0 deletions

diff --git a/sys/netipsec/xform_ipcomp.c b/sys/netipsec/xform_ipcomp.c
new file mode 100644
index 0000000..108d356
--- /dev/null
+++ b/sys/netipsec/xform_ipcomp.c
@@ -0,0 +1,608 @@
+/*	$FreeBSD$	*/
+/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
+
+/*
+ * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/* IP payload compression protocol (IPComp), see RFC 2393 */
+#include "opt_inet.h"
+#include "opt_inet6.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/kernel.h>
+#include <sys/protosw.h>
+#include <sys/sysctl.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+
+#include <net/route.h>
+#include <netipsec/ipsec.h>
+#include <netipsec/xform.h>
+
+#ifdef INET6
+#include <netinet/ip6.h>
+#include <netipsec/ipsec6.h>
+#endif
+
+#include <netipsec/ipcomp.h>
+#include <netipsec/ipcomp_var.h>
+
+#include <netipsec/key.h>
+#include <netipsec/key_debug.h>
+
+#include <opencrypto/cryptodev.h>
+#include <opencrypto/deflate.h>
+#include <opencrypto/xform.h>
+
+int	ipcomp_enable = 0;
+struct	ipcompstat ipcompstat;
+
+SYSCTL_DECL(_net_inet_ipcomp);
+SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
+	ipcomp_enable,	CTLFLAG_RW,	&ipcomp_enable,	0, "");
+SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
+	stats,		CTLFLAG_RD,	&ipcompstat,	ipcompstat, "");
+
+static int ipcomp_input_cb(struct cryptop *crp);
+static int ipcomp_output_cb(struct cryptop *crp);
+
+struct comp_algo *
+ipcomp_algorithm_lookup(int alg)
+{
+	if (alg >= IPCOMP_ALG_MAX)
+		return NULL;
+	switch (alg) {
+	case SADB_X_CALG_DEFLATE:
+		return &comp_algo_deflate;
+	}
+	return NULL;
+}
+
+/*
+ * ipcomp_init() is called when an CPI is being set up.
+ */
+static int
+ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
+{
+	struct comp_algo *tcomp;
+	struct cryptoini cric;
+
+	/* NB: algorithm really comes in alg_enc and not alg_comp! */
+	tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
+	if (tcomp == NULL) {
+		DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
+			 sav->alg_comp));
+		return EINVAL;
+	}
+	sav->alg_comp = sav->alg_enc;		/* set for doing histogram */
+	sav->tdb_xform = xsp;
+	sav->tdb_compalgxform = tcomp;
+
+	/* Initialize crypto session */
+	bzero(&cric, sizeof (cric));
+	cric.cri_alg = sav->tdb_compalgxform->type;
+
+	return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
+}
+
+/*
+ * ipcomp_zeroize() used when IPCA is deleted
+ */
+static int
+ipcomp_zeroize(struct secasvar *sav)
+{
+	int err;
+
+	err = crypto_freesession(sav->tdb_cryptoid);
+	sav->tdb_cryptoid = 0;
+	return err;
+}
+
+/*
+ * ipcomp_input() gets called to uncompress an input packet
+ */
+static int
+ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
+{
+	struct tdb_crypto *tc;
+	struct cryptodesc *crdc;
+	struct cryptop *crp;
+	int hlen = IPCOMP_HLENGTH;
+
+#if 0
+	SPLASSERT(net, "ipcomp_input");
+#endif
+
+	/* Get crypto descriptors */
+	crp = crypto_getreq(1);
+	if (crp == NULL) {
+		m_freem(m);
+		DPRINTF(("ipcomp_input: no crypto descriptors\n"));
+		ipcompstat.ipcomps_crypto++;
+		return ENOBUFS;
+	}
+	/* Get IPsec-specific opaque pointer */
+	tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
+	if (tc == NULL) {
+		m_freem(m);
+		crypto_freereq(crp);
+		DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
+		ipcompstat.ipcomps_crypto++;
+		return ENOBUFS;
+	}
+	crdc = crp->crp_desc;
+
+	crdc->crd_skip = skip + hlen;
+	crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
+	crdc->crd_inject = skip;
+
+	tc->tc_ptr = 0;
+
+	/* Decompression operation */
+	crdc->crd_alg = sav->tdb_compalgxform->type;
+
+	/* Crypto operation descriptor */
+	crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
+	crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_NODELAY;
+	crp->crp_buf = (caddr_t) m;
+	crp->crp_callback = ipcomp_input_cb;
+	crp->crp_sid = sav->tdb_cryptoid;
+	crp->crp_opaque = (caddr_t) tc;
+
+	/* These are passed as-is to the callback */
+	tc->tc_spi = sav->spi;
+	tc->tc_dst = sav->sah->saidx.dst;
+	tc->tc_proto = sav->sah->saidx.proto;
+	tc->tc_protoff = protoff;
+	tc->tc_skip = skip;
+
+	return crypto_dispatch(crp);
+}
+
+#ifdef INET6
+#define	IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {		     \
+	if (saidx->dst.sa.sa_family == AF_INET6) {			     \
+		error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
+	} else {							     \
+		error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
+	}								     \
+} while (0)
+#else
+#define	IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)		     \
+	(error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
+#endif
+
+/*
+ * IPComp input callback from the crypto driver.
+ */
+static int
+ipcomp_input_cb(struct cryptop *crp)
+{
+	struct cryptodesc *crd;
+	struct tdb_crypto *tc;
+	int skip, protoff;
+	struct mtag *mtag;
+	struct mbuf *m;
+	struct secasvar *sav;
+	struct secasindex *saidx;
+	int s, hlen = IPCOMP_HLENGTH, error, clen;
+	u_int8_t nproto;
+	caddr_t addr;
+
+	crd = crp->crp_desc;
+
+	tc = (struct tdb_crypto *) crp->crp_opaque;
+	KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
+	skip = tc->tc_skip;
+	protoff = tc->tc_protoff;
+	mtag = (struct mtag *) tc->tc_ptr;
+	m = (struct mbuf *) crp->crp_buf;
+
+	s = splnet();
+
+	sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
+	if (sav == NULL) {
+		ipcompstat.ipcomps_notdb++;
+		DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
+		error = ENOBUFS;		/*XXX*/
+		goto bad;
+	}
+
+	saidx = &sav->sah->saidx;
+	KASSERT(saidx->dst.sa.sa_family == AF_INET ||
+		saidx->dst.sa.sa_family == AF_INET6,
+		("ah_input_cb: unexpected protocol family %u",
+		 saidx->dst.sa.sa_family));
+
+	/* Check for crypto errors */
+	if (crp->crp_etype) {
+		/* Reset the session ID */
+		if (sav->tdb_cryptoid != 0)
+			sav->tdb_cryptoid = crp->crp_sid;
+
+		if (crp->crp_etype == EAGAIN) {
+			KEY_FREESAV(&sav);
+			splx(s);
+			return crypto_dispatch(crp);
+		}
+
+		ipcompstat.ipcomps_noxform++;
+		DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
+		error = crp->crp_etype;
+		goto bad;
+	}
+	/* Shouldn't happen... */
+	if (m == NULL) {
+		ipcompstat.ipcomps_crypto++;
+		DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
+		error = EINVAL;
+		goto bad;
+	}
+	ipcompstat.ipcomps_hist[sav->alg_comp]++;
+
+	clen = crp->crp_olen;		/* Length of data after processing */
+
+	/* Release the crypto descriptors */
+	free(tc, M_XDATA), tc = NULL;
+	crypto_freereq(crp), crp = NULL;
+
+	/* In case it's not done already, adjust the size of the mbuf chain */
+	m->m_pkthdr.len = clen + hlen + skip;
+
+	if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
+		ipcompstat.ipcomps_hdrops++;		/*XXX*/
+		DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
+		error = EINVAL;				/*XXX*/
+		goto bad;
+	}
+
+	/* Keep the next protocol field */
+	addr = (caddr_t) mtod(m, struct ip *) + skip;
+	nproto = ((struct ipcomp *) addr)->comp_nxt;
+
+	/* Remove the IPCOMP header */
+	error = m_striphdr(m, skip, hlen);
+	if (error) {
+		ipcompstat.ipcomps_hdrops++;
+		DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
+			 ipsec_address(&sav->sah->saidx.dst),
+			 (u_long) ntohl(sav->spi)));
+		goto bad;
+	}
+
+	/* Restore the Next Protocol field */
+	m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
+
+	IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
+
+	KEY_FREESAV(&sav);
+	splx(s);
+	return error;
+bad:
+	if (sav)
+		KEY_FREESAV(&sav);
+	splx(s);
+	if (m)
+		m_freem(m);
+	if (tc != NULL)
+		free(tc, M_XDATA);
+	if (crp)
+		crypto_freereq(crp);
+	return error;
+}
+
+/*
+ * IPComp output routine, called by ipsec[46]_process_packet()
+ */
+static int
+ipcomp_output(
+	struct mbuf *m,
+	struct ipsecrequest *isr,
+	struct mbuf **mp,
+	int skip,
+	int protoff
+)
+{
+	struct secasvar *sav;
+	struct comp_algo *ipcompx;
+	int error, ralen, hlen, maxpacketsize, roff;
+	u_int8_t prot;
+	struct cryptodesc *crdc;
+	struct cryptop *crp;
+	struct tdb_crypto *tc;
+	struct mbuf *mo;
+	struct ipcomp *ipcomp;
+
+#if 0
+	SPLASSERT(net, "ipcomp_output");
+#endif
+
+	sav = isr->sav;
+	KASSERT(sav != NULL, ("ipcomp_output: null SA"));
+	ipcompx = sav->tdb_compalgxform;
+	KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
+
+	ralen = m->m_pkthdr.len - skip;	/* Raw payload length before comp. */
+	hlen = IPCOMP_HLENGTH;
+
+	ipcompstat.ipcomps_output++;
+
+	/* Check for maximum packet size violations. */
+	switch (sav->sah->saidx.dst.sa.sa_family) {
+#ifdef INET
+	case AF_INET:
+		maxpacketsize =  IP_MAXPACKET;
+		break;
+#endif /* INET */
+#ifdef INET6
+	case AF_INET6:
+		maxpacketsize =  IPV6_MAXPACKET;
+		break;
+#endif /* INET6 */
+	default:
+		ipcompstat.ipcomps_nopf++;
+		DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
+		    ", IPCA %s/%08lx\n", 
+		    sav->sah->saidx.dst.sa.sa_family,
+		    ipsec_address(&sav->sah->saidx.dst),
+		    (u_long) ntohl(sav->spi)));
+		error = EPFNOSUPPORT;
+		goto bad;
+	}
+	if (skip + hlen + ralen > maxpacketsize) {
+		ipcompstat.ipcomps_toobig++;
+		DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
+		    "(len %u, max len %u)\n",
+		    ipsec_address(&sav->sah->saidx.dst),
+		    (u_long) ntohl(sav->spi),
+		    skip + hlen + ralen, maxpacketsize));
+		error = EMSGSIZE;
+		goto bad;
+	}
+
+	/* Update the counters */
+	ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
+
+	m = m_clone(m);
+	if (m == NULL) {
+		ipcompstat.ipcomps_hdrops++;
+		DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", 
+		    ipsec_address(&sav->sah->saidx.dst),
+		    (u_long) ntohl(sav->spi)));
+		error = ENOBUFS;
+		goto bad;
+	}
+
+	/* Inject IPCOMP header */
+	mo = m_makespace(m, skip, hlen, &roff);
+	if (mo == NULL) {
+		ipcompstat.ipcomps_wrap++;
+		DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
+		    "IPCA %s/%08lx\n",
+		    ipsec_address(&sav->sah->saidx.dst),
+		    (u_long) ntohl(sav->spi)));
+		error = ENOBUFS;
+		goto bad;
+	}
+	ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
+
+	/* Initialize the IPCOMP header */
+	/* XXX alignment always correct? */
+	switch (sav->sah->saidx.dst.sa.sa_family) {
+#ifdef INET
+	case AF_INET:
+		ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
+		break;
+#endif /* INET */
+#ifdef INET6
+	case AF_INET6:
+		ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
+		break;
+#endif
+	}
+	ipcomp->comp_flags = 0;
+	ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
+
+	/* Fix Next Protocol in IPv4/IPv6 header */
+	prot = IPPROTO_IPCOMP;
+	m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
+
+	/* Ok now, we can pass to the crypto processing */
+
+	/* Get crypto descriptors */
+	crp = crypto_getreq(1);
+	if (crp == NULL) {
+		ipcompstat.ipcomps_crypto++;
+		DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
+		error = ENOBUFS;
+		goto bad;
+	}
+	crdc = crp->crp_desc;
+
+	/* Compression descriptor */
+	crdc->crd_skip = skip + hlen;
+	crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
+	crdc->crd_flags = CRD_F_COMP;
+	crdc->crd_inject = skip + hlen;
+
+	/* Compression operation */
+	crdc->crd_alg = ipcompx->type;
+
+	/* IPsec-specific opaque crypto info */
+	tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
+		M_XDATA, M_NOWAIT|M_ZERO);
+	if (tc == NULL) {
+		ipcompstat.ipcomps_crypto++;
+		DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
+		crypto_freereq(crp);
+		error = ENOBUFS;
+		goto bad;
+	}
+
+	tc->tc_isr = isr;
+	tc->tc_spi = sav->spi;
+	tc->tc_dst = sav->sah->saidx.dst;
+	tc->tc_proto = sav->sah->saidx.proto;
+	tc->tc_skip = skip + hlen;
+
+	/* Crypto operation descriptor */
+	crp->crp_ilen = m->m_pkthdr.len;	/* Total input length */
+	crp->crp_flags = CRYPTO_F_IMBUF;
+	crp->crp_buf = (caddr_t) m;
+	crp->crp_callback = ipcomp_output_cb;
+	crp->crp_opaque = (caddr_t) tc;
+	crp->crp_sid = sav->tdb_cryptoid;
+
+	return crypto_dispatch(crp);
+bad:
+	if (m)
+		m_freem(m);
+	return (error);
+}
+
+/*
+ * IPComp output callback from the crypto driver.
+ */
+static int
+ipcomp_output_cb(struct cryptop *crp)
+{
+	struct tdb_crypto *tc;
+	struct ipsecrequest *isr;
+	struct secasvar *sav;
+	struct mbuf *m;
+	int s, error, skip, rlen;
+
+	tc = (struct tdb_crypto *) crp->crp_opaque;
+	KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
+	m = (struct mbuf *) crp->crp_buf;
+	skip = tc->tc_skip;
+	rlen = crp->crp_ilen - skip;
+
+	s = splnet();
+
+	isr = tc->tc_isr;
+	sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
+	if (sav == NULL) {
+		ipcompstat.ipcomps_notdb++;
+		DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
+		error = ENOBUFS;		/*XXX*/
+		goto bad;
+	}
+	KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
+
+	/* Check for crypto errors */
+	if (crp->crp_etype) {
+		/* Reset session ID */
+		if (sav->tdb_cryptoid != 0)
+			sav->tdb_cryptoid = crp->crp_sid;
+
+		if (crp->crp_etype == EAGAIN) {
+			KEY_FREESAV(&sav);
+			splx(s);
+			return crypto_dispatch(crp);
+		}
+		ipcompstat.ipcomps_noxform++;
+		DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
+		error = crp->crp_etype;
+		goto bad;
+	}
+	/* Shouldn't happen... */
+	if (m == NULL) {
+		ipcompstat.ipcomps_crypto++;
+		DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
+		error = EINVAL;
+		goto bad;
+	}
+	ipcompstat.ipcomps_hist[sav->alg_comp]++;
+
+	if (rlen > crp->crp_olen) {
+		/* Adjust the length in the IP header */
+		switch (sav->sah->saidx.dst.sa.sa_family) {
+#ifdef INET
+		case AF_INET:
+			mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
+			break;
+#endif /* INET */
+#ifdef INET6
+		case AF_INET6:
+			mtod(m, struct ip6_hdr *)->ip6_plen =
+				htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
+			break;
+#endif /* INET6 */
+		default:
+			ipcompstat.ipcomps_nopf++;
+			DPRINTF(("ipcomp_output: unknown/unsupported protocol "
+			    "family %d, IPCA %s/%08lx\n", 
+			    sav->sah->saidx.dst.sa.sa_family,
+			    ipsec_address(&sav->sah->saidx.dst), 
+			    (u_long) ntohl(sav->spi)));
+			error = EPFNOSUPPORT;
+			goto bad;
+		}
+	} else {
+		/* compression was useless, we have lost time */
+		/* XXX add statistic */
+	}
+
+	/* Release the crypto descriptor */
+	free(tc, M_XDATA);
+	crypto_freereq(crp);
+
+	/* NB: m is reclaimed by ipsec_process_done. */
+	error = ipsec_process_done(m, isr);
+	KEY_FREESAV(&sav);
+	splx(s);
+	return error;
+bad:
+	if (sav)
+		KEY_FREESAV(&sav);
+	splx(s);
+	if (m)
+		m_freem(m);
+	free(tc, M_XDATA);
+	crypto_freereq(crp);
+	return error;
+}
+
+static struct xformsw ipcomp_xformsw = {
+	XF_IPCOMP,		XFT_COMP,		"IPcomp",
+	ipcomp_init,		ipcomp_zeroize,		ipcomp_input,
+	ipcomp_output
+};
+
+static void
+ipcomp_attach(void)
+{
+	xform_register(&ipcomp_xformsw);
+}
+SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)