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freebsd-skq/sys/netipsec/xform_ipcomp.c
glebius 337378e04f Widen NET_EPOCH coverage. 
When epoch(9) was introduced to network stack, it was basically
dropped in place of existing locking, which was mutexes and
rwlocks. For the sake of performance mutex covered areas were
as small as possible, so became epoch covered areas.

However, epoch doesn't introduce any contention, it just delays
memory reclaim. So, there is no point to minimise epoch covered
areas in sense of performance. Meanwhile entering/exiting epoch
also has non-zero CPU usage, so doing this less often is a win.

Not the least is also code maintainability. In the new paradigm
we can assume that at any stage of processing a packet, we are
inside network epoch. This makes coding both input and output
path way easier.

On output path we already enter epoch quite early - in the
ip_output(), in the ip6_output().

This patch does the same for the input path. All ISR processing,
network related callouts, other ways of packet injection to the
network stack shall be performed in net_epoch. Any leaf function
that walks network configuration now asserts epoch.

Tricky part is configuration code paths - ioctls, sysctls. They
also call into leaf functions, so some need to be changed.

This patch would introduce more epoch recursions (see EPOCH_TRACE)
than we had before. They will be cleaned up separately, as several
of them aren't trivial. Note, that unlike a lock recursion the
epoch recursion is safe and just wastes a bit of resources.

Reviewed by:	gallatin, hselasky, cy, adrian, kristof
Differential Revision:	https://reviews.freebsd.org/D19111
2019-10-07 22:40:05 +00:00

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/* $FreeBSD$ */
/* $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 cryptoini cric;
/* 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 */
bzero(&cric, sizeof (cric));
cric.cri_alg = sav->tdb_compalgxform->type;
return crypto_newsession(&sav->tdb_cryptoid, &cric, 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 cryptodesc *crdc;
struct cryptop *crp;
struct ipcomp *ipcomp;
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;
}
/* Get crypto descriptors */
crp = crypto_getreq(1);
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;
}
crdc = crp->crp_desc;
crdc->crd_skip = skip + hlen;
crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
crdc->crd_inject = skip;
/* 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_CBIFSYNC;
crp->crp_buf = (caddr_t) m;
crp->crp_callback = ipcomp_input_cb;
crp->crp_opaque = (caddr_t) xd;
/* These are passed as-is to the callback */
xd->sav = sav;
xd->protoff = protoff;
xd->skip = skip;
xd->vnet = curvnet;
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 = (struct mbuf *) crp->crp_buf;
xd = (struct xform_data *) 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 cryptodesc *crdc;
struct cryptop *crp;
struct xform_data *xd;
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. */
/* Get crypto descriptors */
crp = crypto_getreq(1);
if (crp == NULL) {
IPCOMPSTAT_INC(ipcomps_crypto);
DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
error = ENOBUFS;
goto bad;
}
crdc = crp->crp_desc;
/* Compression descriptor */
crdc->crd_skip = skip;
crdc->crd_len = ralen;
crdc->crd_flags = CRD_F_COMP;
crdc->crd_inject = skip;
/* Compression operation */
crdc->crd_alg = ipcompx->type;
/* 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;
/* Crypto operation descriptor */
crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
crp->crp_buf = (caddr_t) m;
crp->crp_callback = ipcomp_output_cb;
crp->crp_opaque = (caddr_t) xd;
SECASVAR_LOCK(sav);
crp->crp_session = xd->cryptoid = sav->tdb_cryptoid;
SECASVAR_UNLOCK(sav);
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 = (struct mbuf *) crp->crp_buf;
xd = (struct xform_data *) 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_ilen - skip > 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 <= %d\n",
__func__, crp->crp_ilen, skip, 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);
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