freebsd-skq/sys/netipsec/key_debug.c
ae 84b82e8873 Rename ip4_def_policy variable to def_policy. It is used by both IPv4 and
IPv6. Initialize it only once in def_policy_init(). Remove its
initialization from key_init() and make it static.

Remove several fields from struct secpolicy:
* lock - it isn't so useful having mutex in the structure, but the only
  thing we do with it is initialization and destroying.
* state - it has only two values - DEAD and ALIVE. Instead of take a lock
  and change the state to DEAD, then take lock again in GC function and
  delete policy from the chain - keep in the chain only ALIVE policies.
* scangen - it was used in GC function to protect from sending several
  SADB_SPDEXPIRE messages for one SPD entry. Now we don't keep DEAD entries
  in the chain and there is no need to have scangen variable.

Use TAILQ to implement SPD entries chain. Use rmlock to protect access
to SPD entries chain. Protect all SP lookup with RLOCK, and use WLOCK
when we are inserting (or removing) SP entry in the chain.

Instead of using pattern "LOCK(); refcnt++; UNLOCK();", use refcount(9)
API to implement refcounting in SPD. Merge code from key_delsp() and
_key_delsp() into _key_freesp(). And use KEY_FREESP() macro in all cases
when we want to release reference or just delete SP entry.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2014-12-24 18:34:56 +00:00

747 lines
18 KiB
C

/* $FreeBSD$ */
/* $KAME: key_debug.c,v 1.26 2001/06/27 10:46:50 sakane Exp $ */
/*-
* 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.
*/
#ifdef _KERNEL
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#endif
#include <sys/types.h>
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#endif
#include <sys/socket.h>
#include <net/vnet.h>
#include <netipsec/key_var.h>
#include <netipsec/key_debug.h>
#include <netinet/in.h>
#include <netipsec/ipsec.h>
#ifdef _KERNEL
#include <netipsec/keydb.h>
#endif
#ifndef _KERNEL
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#endif /* !_KERNEL */
static void kdebug_sadb_prop(struct sadb_ext *);
static void kdebug_sadb_identity(struct sadb_ext *);
static void kdebug_sadb_supported(struct sadb_ext *);
static void kdebug_sadb_lifetime(struct sadb_ext *);
static void kdebug_sadb_sa(struct sadb_ext *);
static void kdebug_sadb_address(struct sadb_ext *);
static void kdebug_sadb_key(struct sadb_ext *);
static void kdebug_sadb_x_sa2(struct sadb_ext *);
#ifdef _KERNEL
static void kdebug_secreplay(struct secreplay *);
#endif
#ifndef _KERNEL
#define panic(fmt, ...) { printf(fmt, ## __VA_ARGS__); exit(-1); }
#endif
/* NOTE: host byte order */
/* %%%: about struct sadb_msg */
void
kdebug_sadb(struct sadb_msg *base)
{
struct sadb_ext *ext;
int tlen, extlen;
/* sanity check */
if (base == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_msg{ version=%u type=%u errno=%u satype=%u\n",
base->sadb_msg_version, base->sadb_msg_type,
base->sadb_msg_errno, base->sadb_msg_satype);
printf(" len=%u reserved=%u seq=%u pid=%u\n",
base->sadb_msg_len, base->sadb_msg_reserved,
base->sadb_msg_seq, base->sadb_msg_pid);
tlen = PFKEY_UNUNIT64(base->sadb_msg_len) - sizeof(struct sadb_msg);
ext = (struct sadb_ext *)((caddr_t)base + sizeof(struct sadb_msg));
while (tlen > 0) {
printf("sadb_ext{ len=%u type=%u }\n",
ext->sadb_ext_len, ext->sadb_ext_type);
if (ext->sadb_ext_len == 0) {
printf("%s: invalid ext_len=0 was passed.\n", __func__);
return;
}
if (ext->sadb_ext_len > tlen) {
printf("%s: ext_len too big (%u > %u).\n",
__func__, ext->sadb_ext_len, tlen);
return;
}
switch (ext->sadb_ext_type) {
case SADB_EXT_SA:
kdebug_sadb_sa(ext);
break;
case SADB_EXT_LIFETIME_CURRENT:
case SADB_EXT_LIFETIME_HARD:
case SADB_EXT_LIFETIME_SOFT:
kdebug_sadb_lifetime(ext);
break;
case SADB_EXT_ADDRESS_SRC:
case SADB_EXT_ADDRESS_DST:
case SADB_EXT_ADDRESS_PROXY:
kdebug_sadb_address(ext);
break;
case SADB_EXT_KEY_AUTH:
case SADB_EXT_KEY_ENCRYPT:
kdebug_sadb_key(ext);
break;
case SADB_EXT_IDENTITY_SRC:
case SADB_EXT_IDENTITY_DST:
kdebug_sadb_identity(ext);
break;
case SADB_EXT_SENSITIVITY:
break;
case SADB_EXT_PROPOSAL:
kdebug_sadb_prop(ext);
break;
case SADB_EXT_SUPPORTED_AUTH:
case SADB_EXT_SUPPORTED_ENCRYPT:
kdebug_sadb_supported(ext);
break;
case SADB_EXT_SPIRANGE:
case SADB_X_EXT_KMPRIVATE:
break;
case SADB_X_EXT_POLICY:
kdebug_sadb_x_policy(ext);
break;
case SADB_X_EXT_SA2:
kdebug_sadb_x_sa2(ext);
break;
default:
printf("%s: invalid ext_type %u\n", __func__,
ext->sadb_ext_type);
return;
}
extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
tlen -= extlen;
ext = (struct sadb_ext *)((caddr_t)ext + extlen);
}
return;
}
static void
kdebug_sadb_prop(struct sadb_ext *ext)
{
struct sadb_prop *prop = (struct sadb_prop *)ext;
struct sadb_comb *comb;
int len;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
len = (PFKEY_UNUNIT64(prop->sadb_prop_len) - sizeof(*prop))
/ sizeof(*comb);
comb = (struct sadb_comb *)(prop + 1);
printf("sadb_prop{ replay=%u\n", prop->sadb_prop_replay);
while (len--) {
printf("sadb_comb{ auth=%u encrypt=%u "
"flags=0x%04x reserved=0x%08x\n",
comb->sadb_comb_auth, comb->sadb_comb_encrypt,
comb->sadb_comb_flags, comb->sadb_comb_reserved);
printf(" auth_minbits=%u auth_maxbits=%u "
"encrypt_minbits=%u encrypt_maxbits=%u\n",
comb->sadb_comb_auth_minbits,
comb->sadb_comb_auth_maxbits,
comb->sadb_comb_encrypt_minbits,
comb->sadb_comb_encrypt_maxbits);
printf(" soft_alloc=%u hard_alloc=%u "
"soft_bytes=%lu hard_bytes=%lu\n",
comb->sadb_comb_soft_allocations,
comb->sadb_comb_hard_allocations,
(unsigned long)comb->sadb_comb_soft_bytes,
(unsigned long)comb->sadb_comb_hard_bytes);
printf(" soft_alloc=%lu hard_alloc=%lu "
"soft_bytes=%lu hard_bytes=%lu }\n",
(unsigned long)comb->sadb_comb_soft_addtime,
(unsigned long)comb->sadb_comb_hard_addtime,
(unsigned long)comb->sadb_comb_soft_usetime,
(unsigned long)comb->sadb_comb_hard_usetime);
comb++;
}
printf("}\n");
return;
}
static void
kdebug_sadb_identity(struct sadb_ext *ext)
{
struct sadb_ident *id = (struct sadb_ident *)ext;
int len;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
len = PFKEY_UNUNIT64(id->sadb_ident_len) - sizeof(*id);
printf("sadb_ident_%s{",
id->sadb_ident_exttype == SADB_EXT_IDENTITY_SRC ? "src" : "dst");
switch (id->sadb_ident_type) {
default:
printf(" type=%d id=%lu",
id->sadb_ident_type, (u_long)id->sadb_ident_id);
if (len) {
#ifdef _KERNEL
ipsec_hexdump((caddr_t)(id + 1), len); /*XXX cast ?*/
#else
char *p, *ep;
printf("\n str=\"");
p = (char *)(id + 1);
ep = p + len;
for (/*nothing*/; *p && p < ep; p++) {
if (isprint(*p))
printf("%c", *p & 0xff);
else
printf("\\%03o", *p & 0xff);
}
#endif
printf("\"");
}
break;
}
printf(" }\n");
return;
}
static void
kdebug_sadb_supported(struct sadb_ext *ext)
{
struct sadb_supported *sup = (struct sadb_supported *)ext;
struct sadb_alg *alg;
int len;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
len = (PFKEY_UNUNIT64(sup->sadb_supported_len) - sizeof(*sup))
/ sizeof(*alg);
alg = (struct sadb_alg *)(sup + 1);
printf("sadb_sup{\n");
while (len--) {
printf(" { id=%d ivlen=%d min=%d max=%d }\n",
alg->sadb_alg_id, alg->sadb_alg_ivlen,
alg->sadb_alg_minbits, alg->sadb_alg_maxbits);
alg++;
}
printf("}\n");
return;
}
static void
kdebug_sadb_lifetime(struct sadb_ext *ext)
{
struct sadb_lifetime *lft = (struct sadb_lifetime *)ext;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_lifetime{ alloc=%u, bytes=%u\n",
lft->sadb_lifetime_allocations,
(u_int32_t)lft->sadb_lifetime_bytes);
printf(" addtime=%u, usetime=%u }\n",
(u_int32_t)lft->sadb_lifetime_addtime,
(u_int32_t)lft->sadb_lifetime_usetime);
return;
}
static void
kdebug_sadb_sa(struct sadb_ext *ext)
{
struct sadb_sa *sa = (struct sadb_sa *)ext;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_sa{ spi=%u replay=%u state=%u\n",
(u_int32_t)ntohl(sa->sadb_sa_spi), sa->sadb_sa_replay,
sa->sadb_sa_state);
printf(" auth=%u encrypt=%u flags=0x%08x }\n",
sa->sadb_sa_auth, sa->sadb_sa_encrypt, sa->sadb_sa_flags);
return;
}
static void
kdebug_sadb_address(struct sadb_ext *ext)
{
struct sadb_address *addr = (struct sadb_address *)ext;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_address{ proto=%u prefixlen=%u reserved=0x%02x%02x }\n",
addr->sadb_address_proto, addr->sadb_address_prefixlen,
((u_char *)&addr->sadb_address_reserved)[0],
((u_char *)&addr->sadb_address_reserved)[1]);
kdebug_sockaddr((struct sockaddr *)((caddr_t)ext + sizeof(*addr)));
return;
}
static void
kdebug_sadb_key(struct sadb_ext *ext)
{
struct sadb_key *key = (struct sadb_key *)ext;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_key{ bits=%u reserved=%u\n",
key->sadb_key_bits, key->sadb_key_reserved);
printf(" key=");
/* sanity check 2 */
if ((key->sadb_key_bits >> 3) >
(PFKEY_UNUNIT64(key->sadb_key_len) - sizeof(struct sadb_key))) {
printf("%s: key length mismatch, bit:%d len:%ld.\n",
__func__,
key->sadb_key_bits >> 3,
(long)PFKEY_UNUNIT64(key->sadb_key_len) - sizeof(struct sadb_key));
}
ipsec_hexdump((caddr_t)key + sizeof(struct sadb_key),
key->sadb_key_bits >> 3);
printf(" }\n");
return;
}
static void
kdebug_sadb_x_sa2(struct sadb_ext *ext)
{
struct sadb_x_sa2 *sa2 = (struct sadb_x_sa2 *)ext;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_x_sa2{ mode=%u reqid=%u\n",
sa2->sadb_x_sa2_mode, sa2->sadb_x_sa2_reqid);
printf(" reserved1=%u reserved2=%u sequence=%u }\n",
sa2->sadb_x_sa2_reserved1, sa2->sadb_x_sa2_reserved2,
sa2->sadb_x_sa2_sequence);
return;
}
void
kdebug_sadb_x_policy(struct sadb_ext *ext)
{
struct sadb_x_policy *xpl = (struct sadb_x_policy *)ext;
struct sockaddr *addr;
/* sanity check */
if (ext == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sadb_x_policy{ type=%u dir=%u id=%x }\n",
xpl->sadb_x_policy_type, xpl->sadb_x_policy_dir,
xpl->sadb_x_policy_id);
if (xpl->sadb_x_policy_type == IPSEC_POLICY_IPSEC) {
int tlen;
struct sadb_x_ipsecrequest *xisr;
tlen = PFKEY_UNUNIT64(xpl->sadb_x_policy_len) - sizeof(*xpl);
xisr = (struct sadb_x_ipsecrequest *)(xpl + 1);
while (tlen > 0) {
printf(" { len=%u proto=%u mode=%u level=%u reqid=%u\n",
xisr->sadb_x_ipsecrequest_len,
xisr->sadb_x_ipsecrequest_proto,
xisr->sadb_x_ipsecrequest_mode,
xisr->sadb_x_ipsecrequest_level,
xisr->sadb_x_ipsecrequest_reqid);
if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
addr = (struct sockaddr *)(xisr + 1);
kdebug_sockaddr(addr);
addr = (struct sockaddr *)((caddr_t)addr
+ addr->sa_len);
kdebug_sockaddr(addr);
}
printf(" }\n");
/* prevent infinite loop */
if (xisr->sadb_x_ipsecrequest_len <= 0) {
printf("%s: wrong policy struct.\n", __func__);
return;
}
/* prevent overflow */
if (xisr->sadb_x_ipsecrequest_len > tlen) {
printf("%s: invalid ipsec policy length "
"(%u > %u)\n", __func__,
xisr->sadb_x_ipsecrequest_len, tlen);
return;
}
tlen -= xisr->sadb_x_ipsecrequest_len;
xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
+ xisr->sadb_x_ipsecrequest_len);
}
if (tlen != 0)
panic("%s: wrong policy struct.\n", __func__);
}
return;
}
#ifdef _KERNEL
/* %%%: about SPD and SAD */
void
kdebug_secpolicy(struct secpolicy *sp)
{
/* sanity check */
if (sp == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("secpolicy{ refcnt=%u policy=%u\n",
sp->refcnt, sp->policy);
kdebug_secpolicyindex(&sp->spidx);
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
printf(" type=discard }\n");
break;
case IPSEC_POLICY_NONE:
printf(" type=none }\n");
break;
case IPSEC_POLICY_IPSEC:
{
struct ipsecrequest *isr;
for (isr = sp->req; isr != NULL; isr = isr->next) {
printf(" level=%u\n", isr->level);
kdebug_secasindex(&isr->saidx);
if (isr->sav != NULL)
kdebug_secasv(isr->sav);
}
printf(" }\n");
}
break;
case IPSEC_POLICY_BYPASS:
printf(" type=bypass }\n");
break;
case IPSEC_POLICY_ENTRUST:
printf(" type=entrust }\n");
break;
default:
printf("%s: Invalid policy found. %d\n", __func__, sp->policy);
break;
}
return;
}
void
kdebug_secpolicyindex(struct secpolicyindex *spidx)
{
/* sanity check */
if (spidx == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("secpolicyindex{ dir=%u prefs=%u prefd=%u ul_proto=%u\n",
spidx->dir, spidx->prefs, spidx->prefd, spidx->ul_proto);
ipsec_hexdump((caddr_t)&spidx->src,
((struct sockaddr *)&spidx->src)->sa_len);
printf("\n");
ipsec_hexdump((caddr_t)&spidx->dst,
((struct sockaddr *)&spidx->dst)->sa_len);
printf("}\n");
return;
}
void
kdebug_secasindex(struct secasindex *saidx)
{
/* sanity check */
if (saidx == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("secasindex{ mode=%u proto=%u\n",
saidx->mode, saidx->proto);
ipsec_hexdump((caddr_t)&saidx->src,
((struct sockaddr *)&saidx->src)->sa_len);
printf("\n");
ipsec_hexdump((caddr_t)&saidx->dst,
((struct sockaddr *)&saidx->dst)->sa_len);
printf("\n");
return;
}
static void
kdebug_sec_lifetime(struct seclifetime *lft)
{
/* sanity check */
if (lft == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("sec_lifetime{ alloc=%u, bytes=%u\n",
lft->allocations, (u_int32_t)lft->bytes);
printf(" addtime=%u, usetime=%u }\n",
(u_int32_t)lft->addtime, (u_int32_t)lft->usetime);
return;
}
void
kdebug_secasv(struct secasvar *sav)
{
/* sanity check */
if (sav == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf("secas{");
kdebug_secasindex(&sav->sah->saidx);
printf(" refcnt=%u state=%u auth=%u enc=%u\n",
sav->refcnt, sav->state, sav->alg_auth, sav->alg_enc);
printf(" spi=%u flags=%u\n",
(u_int32_t)ntohl(sav->spi), sav->flags);
if (sav->key_auth != NULL)
kdebug_sadb_key((struct sadb_ext *)sav->key_auth);
if (sav->key_enc != NULL)
kdebug_sadb_key((struct sadb_ext *)sav->key_enc);
if (sav->iv != NULL) {
printf(" iv=");
ipsec_hexdump(sav->iv, sav->ivlen ? sav->ivlen : 8);
printf("\n");
}
if (sav->replay != NULL)
kdebug_secreplay(sav->replay);
if (sav->lft_c != NULL)
kdebug_sec_lifetime(sav->lft_c);
if (sav->lft_h != NULL)
kdebug_sec_lifetime(sav->lft_h);
if (sav->lft_s != NULL)
kdebug_sec_lifetime(sav->lft_s);
#ifdef notyet
/* XXX: misc[123] ? */
#endif
return;
}
static void
kdebug_secreplay(struct secreplay *rpl)
{
int len, l;
/* sanity check */
if (rpl == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
printf(" secreplay{ count=%u wsize=%u seq=%u lastseq=%u",
rpl->count, rpl->wsize, rpl->seq, rpl->lastseq);
if (rpl->bitmap == NULL) {
printf(" }\n");
return;
}
printf("\n bitmap { ");
for (len = 0; len < rpl->wsize; len++) {
for (l = 7; l >= 0; l--)
printf("%u", (((rpl->bitmap)[len] >> l) & 1) ? 1 : 0);
}
printf(" }\n");
return;
}
void
kdebug_mbufhdr(struct mbuf *m)
{
/* sanity check */
if (m == NULL)
return;
printf("mbuf(%p){ m_next:%p m_nextpkt:%p m_data:%p "
"m_len:%d m_type:0x%02x m_flags:0x%02x }\n",
m, m->m_next, m->m_nextpkt, m->m_data,
m->m_len, m->m_type, m->m_flags);
if (m->m_flags & M_PKTHDR) {
printf(" m_pkthdr{ len:%d rcvif:%p }\n",
m->m_pkthdr.len, m->m_pkthdr.rcvif);
}
if (m->m_flags & M_EXT) {
printf(" m_ext{ ext_buf:%p ext_free:%p "
"ext_size:%u ext_cnt:%p }\n",
m->m_ext.ext_buf, m->m_ext.ext_free,
m->m_ext.ext_size, m->m_ext.ext_cnt);
}
return;
}
void
kdebug_mbuf(struct mbuf *m0)
{
struct mbuf *m = m0;
int i, j;
for (j = 0; m; m = m->m_next) {
kdebug_mbufhdr(m);
printf(" m_data:\n");
for (i = 0; i < m->m_len; i++) {
if (i && i % 32 == 0)
printf("\n");
if (i % 4 == 0)
printf(" ");
printf("%02x", mtod(m, u_char *)[i]);
j++;
}
printf("\n");
}
return;
}
#endif /* _KERNEL */
void
kdebug_sockaddr(struct sockaddr *addr)
{
struct sockaddr_in *sin4;
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
/* sanity check */
if (addr == NULL)
panic("%s: NULL pointer was passed.\n", __func__);
/* NOTE: We deal with port number as host byte order. */
printf("sockaddr{ len=%u family=%u", addr->sa_len, addr->sa_family);
switch (addr->sa_family) {
case AF_INET:
sin4 = (struct sockaddr_in *)addr;
printf(" port=%u\n", ntohs(sin4->sin_port));
ipsec_hexdump((caddr_t)&sin4->sin_addr, sizeof(sin4->sin_addr));
break;
#ifdef INET6
case AF_INET6:
sin6 = (struct sockaddr_in6 *)addr;
printf(" port=%u\n", ntohs(sin6->sin6_port));
printf(" flowinfo=0x%08x, scope_id=0x%08x\n",
sin6->sin6_flowinfo, sin6->sin6_scope_id);
ipsec_hexdump((caddr_t)&sin6->sin6_addr,
sizeof(sin6->sin6_addr));
break;
#endif
}
printf(" }\n");
return;
}
void
ipsec_bindump(caddr_t buf, int len)
{
int i;
for (i = 0; i < len; i++)
printf("%c", (unsigned char)buf[i]);
return;
}
void
ipsec_hexdump(caddr_t buf, int len)
{
int i;
for (i = 0; i < len; i++) {
if (i != 0 && i % 32 == 0) printf("\n");
if (i % 4 == 0) printf(" ");
printf("%02x", (unsigned char)buf[i]);
}
#if 0
if (i % 32 != 0) printf("\n");
#endif
return;
}