9c0e3d3a53
Some crypto consumers such as GELI and KTLS for file-backed sendfile
need to store their output in a separate buffer from the input.
Currently these consumers copy the contents of the input buffer into
the output buffer and queue an in-place crypto operation on the output
buffer. Using a separate output buffer avoids this copy.
- Create a new 'struct crypto_buffer' describing a crypto buffer
containing a type and type-specific fields. crp_ilen is gone,
instead buffers that use a flat kernel buffer have a cb_buf_len
field for their length. The length of other buffer types is
inferred from the backing store (e.g. uio_resid for a uio).
Requests now have two such structures: crp_buf for the input buffer,
and crp_obuf for the output buffer.
- Consumers now use helper functions (crypto_use_*,
e.g. crypto_use_mbuf()) to configure the input buffer. If an output
buffer is not configured, the request still modifies the input
buffer in-place. A consumer uses a second set of helper functions
(crypto_use_output_*) to configure an output buffer.
- Consumers must request support for separate output buffers when
creating a crypto session via the CSP_F_SEPARATE_OUTPUT flag and are
only permitted to queue a request with a separate output buffer on
sessions with this flag set. Existing drivers already reject
sessions with unknown flags, so this permits drivers to be modified
to support this extension without requiring all drivers to change.
- Several data-related functions now have matching versions that
operate on an explicit buffer (e.g. crypto_apply_buf,
crypto_contiguous_subsegment_buf, bus_dma_load_crp_buf).
- Most of the existing data-related functions operate on the input
buffer. However crypto_copyback always writes to the output buffer
if a request uses a separate output buffer.
- For the regions in input/output buffers, the following conventions
are followed:
- AAD and IV are always present in input only and their
fields are offsets into the input buffer.
- payload is always present in both buffers. If a request uses a
separate output buffer, it must set a new crp_payload_start_output
field to the offset of the payload in the output buffer.
- digest is in the input buffer for verify operations, and in the
output buffer for compute operations. crp_digest_start is relative
to the appropriate buffer.
- Add a crypto buffer cursor abstraction. This is a more general form
of some bits in the cryptosoft driver that tried to always use uio's.
However, compared to the original code, this avoids rewalking the uio
iovec array for requests with multiple vectors. It also avoids
allocate an iovec array for mbufs and populating it by instead walking
the mbuf chain directly.
- Update the cryptosoft(4) driver to support separate output buffers
making use of the cursor abstraction.
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D24545
776 lines
20 KiB
C
776 lines
20 KiB
C
/* $FreeBSD$ */
|
|
/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
|
|
|
|
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* 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/lock.h>
|
|
#include <sys/mutex.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 <netinet/ip_encap.h>
|
|
|
|
#include <net/netisr.h>
|
|
#include <net/vnet.h>
|
|
#include <net/if.h> /* XXXGL: net_epoch should move out there */
|
|
#include <net/if_var.h> /* XXXGL: net_epoch should move out there */
|
|
|
|
#include <netipsec/ipsec.h>
|
|
#include <netipsec/xform.h>
|
|
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.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>
|
|
|
|
VNET_DEFINE(int, ipcomp_enable) = 1;
|
|
VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
|
|
VNET_PCPUSTAT_SYSINIT(ipcompstat);
|
|
|
|
#ifdef VIMAGE
|
|
VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
|
|
#endif /* VIMAGE */
|
|
|
|
SYSCTL_DECL(_net_inet_ipcomp);
|
|
SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable,
|
|
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
|
|
SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
|
|
struct ipcompstat, ipcompstat,
|
|
"IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
|
|
|
|
static int ipcomp_input_cb(struct cryptop *crp);
|
|
static int ipcomp_output_cb(struct cryptop *crp);
|
|
|
|
/*
|
|
* RFC 3173 p 2.2. Non-Expansion Policy:
|
|
* If the total size of a compressed payload and the IPComp header, as
|
|
* defined in section 3, is not smaller than the size of the original
|
|
* payload, the IP datagram MUST be sent in the original non-compressed
|
|
* form.
|
|
*
|
|
* When we use IPComp in tunnel mode, for small packets we will receive
|
|
* encapsulated IP-IP datagrams without any compression and without IPComp
|
|
* header.
|
|
*/
|
|
static int
|
|
ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst)
|
|
{
|
|
struct secasvar *sav;
|
|
|
|
sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP);
|
|
if (sav == NULL)
|
|
return (0);
|
|
key_freesav(&sav);
|
|
|
|
if (src->sa.sa_family == AF_INET)
|
|
return (sizeof(struct in_addr) << 4);
|
|
else
|
|
return (sizeof(struct in6_addr) << 4);
|
|
}
|
|
|
|
static int
|
|
ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused)
|
|
{
|
|
int isr;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
switch (proto) {
|
|
#ifdef INET
|
|
case IPPROTO_IPV4:
|
|
isr = NETISR_IP;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case IPPROTO_IPV6:
|
|
isr = NETISR_IPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
IPCOMPSTAT_INC(ipcomps_nopf);
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
m_adj(m, off);
|
|
IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len);
|
|
IPCOMPSTAT_INC(ipcomps_input);
|
|
netisr_dispatch(isr, m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/*
|
|
* ipcomp_init() is called when an CPI is being set up.
|
|
*/
|
|
static int
|
|
ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
|
|
{
|
|
const struct comp_algo *tcomp;
|
|
struct crypto_session_params csp;
|
|
|
|
/* NB: algorithm really comes in alg_enc and not alg_comp! */
|
|
tcomp = comp_algorithm_lookup(sav->alg_enc);
|
|
if (tcomp == NULL) {
|
|
DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
|
|
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 */
|
|
memset(&csp, 0, sizeof(csp));
|
|
csp.csp_mode = CSP_MODE_COMPRESS;
|
|
csp.csp_cipher_alg = sav->tdb_compalgxform->type;
|
|
|
|
return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support);
|
|
}
|
|
|
|
/*
|
|
* ipcomp_zeroize() used when IPCA is deleted
|
|
*/
|
|
static int
|
|
ipcomp_zeroize(struct secasvar *sav)
|
|
{
|
|
|
|
crypto_freesession(sav->tdb_cryptoid);
|
|
sav->tdb_cryptoid = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ipcomp_input() gets called to uncompress an input packet
|
|
*/
|
|
static int
|
|
ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
|
|
{
|
|
struct xform_data *xd;
|
|
struct cryptop *crp;
|
|
struct ipcomp *ipcomp;
|
|
crypto_session_t cryptoid;
|
|
caddr_t addr;
|
|
int error, hlen = IPCOMP_HLENGTH;
|
|
|
|
/*
|
|
* Check that the next header of the IPComp is not IPComp again, before
|
|
* doing any real work. Given it is not possible to do double
|
|
* compression it means someone is playing tricks on us.
|
|
*/
|
|
error = ENOBUFS;
|
|
if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
|
|
DPRINTF(("%s: m_pullup failed\n", __func__));
|
|
key_freesav(&sav);
|
|
return (error);
|
|
}
|
|
addr = (caddr_t) mtod(m, struct ip *) + skip;
|
|
ipcomp = (struct ipcomp *)addr;
|
|
if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
|
|
IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
|
|
DPRINTF(("%s: recursive compression detected\n", __func__));
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
SECASVAR_LOCK(sav);
|
|
cryptoid = sav->tdb_cryptoid;
|
|
SECASVAR_UNLOCK(sav);
|
|
|
|
/* Get crypto descriptors */
|
|
crp = crypto_getreq(cryptoid, M_NOWAIT);
|
|
if (crp == NULL) {
|
|
DPRINTF(("%s: no crypto descriptors\n", __func__));
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
goto bad;
|
|
}
|
|
/* Get IPsec-specific opaque pointer */
|
|
xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO);
|
|
if (xd == NULL) {
|
|
DPRINTF(("%s: cannot allocate xform_data\n", __func__));
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
crypto_freereq(crp);
|
|
goto bad;
|
|
}
|
|
|
|
/* Decompression operation */
|
|
crp->crp_op = CRYPTO_OP_DECOMPRESS;
|
|
crp->crp_payload_start = skip + hlen;
|
|
crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen);
|
|
|
|
/* Crypto operation descriptor */
|
|
crp->crp_flags = CRYPTO_F_CBIFSYNC;
|
|
crypto_use_mbuf(crp, m);
|
|
crp->crp_callback = ipcomp_input_cb;
|
|
crp->crp_opaque = xd;
|
|
|
|
/* These are passed as-is to the callback */
|
|
xd->sav = sav;
|
|
xd->protoff = protoff;
|
|
xd->skip = skip;
|
|
xd->vnet = curvnet;
|
|
xd->cryptoid = cryptoid;
|
|
|
|
SECASVAR_LOCK(sav);
|
|
crp->crp_session = xd->cryptoid = sav->tdb_cryptoid;
|
|
SECASVAR_UNLOCK(sav);
|
|
|
|
return crypto_dispatch(crp);
|
|
bad:
|
|
m_freem(m);
|
|
key_freesav(&sav);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* IPComp input callback from the crypto driver.
|
|
*/
|
|
static int
|
|
ipcomp_input_cb(struct cryptop *crp)
|
|
{
|
|
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
|
|
struct xform_data *xd;
|
|
struct mbuf *m;
|
|
struct secasvar *sav;
|
|
struct secasindex *saidx;
|
|
caddr_t addr;
|
|
crypto_session_t cryptoid;
|
|
int hlen = IPCOMP_HLENGTH, error, clen;
|
|
int skip, protoff;
|
|
uint8_t nproto;
|
|
|
|
m = crp->crp_buf.cb_mbuf;
|
|
xd = crp->crp_opaque;
|
|
CURVNET_SET(xd->vnet);
|
|
sav = xd->sav;
|
|
skip = xd->skip;
|
|
protoff = xd->protoff;
|
|
cryptoid = xd->cryptoid;
|
|
saidx = &sav->sah->saidx;
|
|
IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
|
|
saidx->dst.sa.sa_family == AF_INET6,
|
|
("unexpected protocol family %u", saidx->dst.sa.sa_family));
|
|
|
|
/* Check for crypto errors */
|
|
if (crp->crp_etype) {
|
|
if (crp->crp_etype == EAGAIN) {
|
|
/* Reset the session ID */
|
|
if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
|
|
crypto_freesession(cryptoid);
|
|
xd->cryptoid = crp->crp_session;
|
|
CURVNET_RESTORE();
|
|
return (crypto_dispatch(crp));
|
|
}
|
|
IPCOMPSTAT_INC(ipcomps_noxform);
|
|
DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
|
|
error = crp->crp_etype;
|
|
goto bad;
|
|
}
|
|
/* Shouldn't happen... */
|
|
if (m == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
|
|
|
|
clen = crp->crp_olen; /* Length of data after processing */
|
|
|
|
/* Release the crypto descriptors */
|
|
free(xd, M_XDATA), xd = 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)) == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
|
|
DPRINTF(("%s: m_pullup failed\n", __func__));
|
|
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_INC(ipcomps_hdrops);
|
|
DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
|
|
ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
|
|
(u_long) ntohl(sav->spi)));
|
|
goto bad;
|
|
}
|
|
|
|
/* Restore the Next Protocol field */
|
|
m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
|
|
|
|
switch (saidx->dst.sa.sa_family) {
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
error = ipsec6_common_input_cb(m, sav, skip, protoff);
|
|
break;
|
|
#endif
|
|
#ifdef INET
|
|
case AF_INET:
|
|
error = ipsec4_common_input_cb(m, sav, skip, protoff);
|
|
break;
|
|
#endif
|
|
default:
|
|
panic("%s: Unexpected address family: %d saidx=%p", __func__,
|
|
saidx->dst.sa.sa_family, saidx);
|
|
}
|
|
CURVNET_RESTORE();
|
|
return error;
|
|
bad:
|
|
CURVNET_RESTORE();
|
|
if (sav != NULL)
|
|
key_freesav(&sav);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
if (xd != NULL)
|
|
free(xd, M_XDATA);
|
|
if (crp != NULL)
|
|
crypto_freereq(crp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* IPComp output routine, called by ipsec[46]_perform_request()
|
|
*/
|
|
static int
|
|
ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
|
|
u_int idx, int skip, int protoff)
|
|
{
|
|
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
|
|
const struct comp_algo *ipcompx;
|
|
struct cryptop *crp;
|
|
struct xform_data *xd;
|
|
crypto_session_t cryptoid;
|
|
int error, ralen, maxpacketsize;
|
|
|
|
IPSEC_ASSERT(sav != NULL, ("null SA"));
|
|
ipcompx = sav->tdb_compalgxform;
|
|
IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
|
|
|
|
/*
|
|
* Do not touch the packet in case our payload to compress
|
|
* is lower than the minimal threshold of the compression
|
|
* alogrithm. We will just send out the data uncompressed.
|
|
* See RFC 3173, 2.2. Non-Expansion Policy.
|
|
*/
|
|
if (m->m_pkthdr.len <= ipcompx->minlen) {
|
|
IPCOMPSTAT_INC(ipcomps_threshold);
|
|
return ipsec_process_done(m, sp, sav, idx);
|
|
}
|
|
|
|
ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
|
|
IPCOMPSTAT_INC(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_INC(ipcomps_nopf);
|
|
DPRINTF(("%s: unknown/unsupported protocol family %d, "
|
|
"IPCA %s/%08lx\n", __func__,
|
|
sav->sah->saidx.dst.sa.sa_family,
|
|
ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
|
|
(u_long) ntohl(sav->spi)));
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
|
|
IPCOMPSTAT_INC(ipcomps_toobig);
|
|
DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
|
|
"(len %u, max len %u)\n", __func__,
|
|
ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
|
|
(u_long) ntohl(sav->spi),
|
|
ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
|
|
/* Update the counters */
|
|
IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
|
|
|
|
m = m_unshare(m, M_NOWAIT);
|
|
if (m == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_hdrops);
|
|
DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
|
|
__func__, ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi)));
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
/* Ok now, we can pass to the crypto processing. */
|
|
SECASVAR_LOCK(sav);
|
|
cryptoid = sav->tdb_cryptoid;
|
|
SECASVAR_UNLOCK(sav);
|
|
|
|
/* Get crypto descriptors */
|
|
crp = crypto_getreq(cryptoid, M_NOWAIT);
|
|
if (crp == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
/* Compression descriptor */
|
|
crp->crp_op = CRYPTO_OP_COMPRESS;
|
|
crp->crp_payload_start = skip;
|
|
crp->crp_payload_length = ralen;
|
|
|
|
/* IPsec-specific opaque crypto info */
|
|
xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO);
|
|
if (xd == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: failed to allocate xform_data\n", __func__));
|
|
crypto_freereq(crp);
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
xd->sp = sp;
|
|
xd->sav = sav;
|
|
xd->idx = idx;
|
|
xd->skip = skip;
|
|
xd->protoff = protoff;
|
|
xd->vnet = curvnet;
|
|
xd->cryptoid = cryptoid;
|
|
|
|
/* Crypto operation descriptor */
|
|
crp->crp_flags = CRYPTO_F_CBIFSYNC;
|
|
crypto_use_mbuf(crp, m);
|
|
crp->crp_callback = ipcomp_output_cb;
|
|
crp->crp_opaque = xd;
|
|
|
|
return crypto_dispatch(crp);
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
key_freesav(&sav);
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* IPComp output callback from the crypto driver.
|
|
*/
|
|
static int
|
|
ipcomp_output_cb(struct cryptop *crp)
|
|
{
|
|
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
|
|
struct xform_data *xd;
|
|
struct secpolicy *sp;
|
|
struct secasvar *sav;
|
|
struct mbuf *m;
|
|
crypto_session_t cryptoid;
|
|
u_int idx;
|
|
int error, skip, protoff;
|
|
|
|
m = crp->crp_buf.cb_mbuf;
|
|
xd = crp->crp_opaque;
|
|
CURVNET_SET(xd->vnet);
|
|
idx = xd->idx;
|
|
sp = xd->sp;
|
|
sav = xd->sav;
|
|
skip = xd->skip;
|
|
protoff = xd->protoff;
|
|
cryptoid = xd->cryptoid;
|
|
|
|
/* Check for crypto errors */
|
|
if (crp->crp_etype) {
|
|
if (crp->crp_etype == EAGAIN) {
|
|
/* Reset the session ID */
|
|
if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
|
|
crypto_freesession(cryptoid);
|
|
xd->cryptoid = crp->crp_session;
|
|
CURVNET_RESTORE();
|
|
return (crypto_dispatch(crp));
|
|
}
|
|
IPCOMPSTAT_INC(ipcomps_noxform);
|
|
DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
|
|
error = crp->crp_etype;
|
|
goto bad;
|
|
}
|
|
/* Shouldn't happen... */
|
|
if (m == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_crypto);
|
|
DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
|
|
|
|
if (crp->crp_payload_length > crp->crp_olen) {
|
|
struct mbuf *mo;
|
|
struct ipcomp *ipcomp;
|
|
int roff;
|
|
uint8_t prot;
|
|
|
|
/* Compression helped, inject IPCOMP header. */
|
|
mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
|
|
if (mo == NULL) {
|
|
IPCOMPSTAT_INC(ipcomps_wrap);
|
|
DPRINTF(("%s: IPCOMP header inject failed "
|
|
"for IPCA %s/%08lx\n",
|
|
__func__, ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (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);
|
|
|
|
/* 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_INC(ipcomps_nopf);
|
|
DPRINTF(("%s: unknown/unsupported protocol "
|
|
"family %d, IPCA %s/%08lx\n", __func__,
|
|
sav->sah->saidx.dst.sa.sa_family,
|
|
ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi)));
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
} else {
|
|
/* Compression was useless, we have lost time. */
|
|
IPCOMPSTAT_INC(ipcomps_uncompr);
|
|
DPRINTF(("%s: compressions was useless %d <= %d\n",
|
|
__func__, crp->crp_payload_length, crp->crp_olen));
|
|
/* XXX remember state to not compress the next couple
|
|
* of packets, RFC 3173, 2.2. Non-Expansion Policy */
|
|
}
|
|
|
|
/* Release the crypto descriptor */
|
|
free(xd, M_XDATA);
|
|
crypto_freereq(crp);
|
|
|
|
/* NB: m is reclaimed by ipsec_process_done. */
|
|
error = ipsec_process_done(m, sp, sav, idx);
|
|
CURVNET_RESTORE();
|
|
return (error);
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
CURVNET_RESTORE();
|
|
free(xd, M_XDATA);
|
|
crypto_freereq(crp);
|
|
key_freesav(&sav);
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef INET
|
|
static int
|
|
ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
|
|
void *arg __unused)
|
|
{
|
|
union sockaddr_union src, dst;
|
|
const struct ip *ip;
|
|
|
|
if (V_ipcomp_enable == 0)
|
|
return (0);
|
|
if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
|
|
return (0);
|
|
bzero(&src, sizeof(src));
|
|
bzero(&dst, sizeof(dst));
|
|
src.sa.sa_family = dst.sa.sa_family = AF_INET;
|
|
src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in);
|
|
ip = mtod(m, const struct ip *);
|
|
src.sin.sin_addr = ip->ip_src;
|
|
dst.sin.sin_addr = ip->ip_dst;
|
|
return (ipcomp_encapcheck(&src, &dst));
|
|
}
|
|
|
|
static const struct encaptab *ipe4_cookie = NULL;
|
|
static const struct encap_config ipv4_encap_cfg = {
|
|
.proto = -1,
|
|
.min_length = sizeof(struct ip),
|
|
.exact_match = sizeof(in_addr_t) << 4,
|
|
.check = ipcomp4_nonexp_encapcheck,
|
|
.input = ipcomp_nonexp_input
|
|
};
|
|
#endif
|
|
#ifdef INET6
|
|
static int
|
|
ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
|
|
void *arg __unused)
|
|
{
|
|
union sockaddr_union src, dst;
|
|
const struct ip6_hdr *ip6;
|
|
|
|
if (V_ipcomp_enable == 0)
|
|
return (0);
|
|
if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
|
|
return (0);
|
|
bzero(&src, sizeof(src));
|
|
bzero(&dst, sizeof(dst));
|
|
src.sa.sa_family = dst.sa.sa_family = AF_INET;
|
|
src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
ip6 = mtod(m, const struct ip6_hdr *);
|
|
src.sin6.sin6_addr = ip6->ip6_src;
|
|
dst.sin6.sin6_addr = ip6->ip6_dst;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) {
|
|
/* XXX: sa6_recoverscope() */
|
|
src.sin6.sin6_scope_id =
|
|
ntohs(src.sin6.sin6_addr.s6_addr16[1]);
|
|
src.sin6.sin6_addr.s6_addr16[1] = 0;
|
|
}
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) {
|
|
/* XXX: sa6_recoverscope() */
|
|
dst.sin6.sin6_scope_id =
|
|
ntohs(dst.sin6.sin6_addr.s6_addr16[1]);
|
|
dst.sin6.sin6_addr.s6_addr16[1] = 0;
|
|
}
|
|
return (ipcomp_encapcheck(&src, &dst));
|
|
}
|
|
|
|
static const struct encaptab *ipe6_cookie = NULL;
|
|
static const struct encap_config ipv6_encap_cfg = {
|
|
.proto = -1,
|
|
.min_length = sizeof(struct ip6_hdr),
|
|
.exact_match = sizeof(struct in6_addr) << 4,
|
|
.check = ipcomp6_nonexp_encapcheck,
|
|
.input = ipcomp_nonexp_input
|
|
};
|
|
#endif
|
|
|
|
static struct xformsw ipcomp_xformsw = {
|
|
.xf_type = XF_IPCOMP,
|
|
.xf_name = "IPcomp",
|
|
.xf_init = ipcomp_init,
|
|
.xf_zeroize = ipcomp_zeroize,
|
|
.xf_input = ipcomp_input,
|
|
.xf_output = ipcomp_output,
|
|
};
|
|
|
|
static void
|
|
ipcomp_attach(void)
|
|
{
|
|
|
|
#ifdef INET
|
|
ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
|
|
#endif
|
|
#ifdef INET6
|
|
ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
|
|
#endif
|
|
xform_attach(&ipcomp_xformsw);
|
|
}
|
|
|
|
static void
|
|
ipcomp_detach(void)
|
|
{
|
|
|
|
#ifdef INET
|
|
ip_encap_detach(ipe4_cookie);
|
|
#endif
|
|
#ifdef INET6
|
|
ip6_encap_detach(ipe6_cookie);
|
|
#endif
|
|
xform_detach(&ipcomp_xformsw);
|
|
}
|
|
|
|
SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
|
|
ipcomp_attach, NULL);
|
|
SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
|
|
ipcomp_detach, NULL);
|