#include <sys/param.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/proc_internal.h>
#include <sys/systm.h>
#include <bsm/audit_kernel.h>
extern struct sysctl_oid *newsysctl_list[];
extern struct sysctl_oid *machdep_sysctl_list[];
static void
sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i);
static struct sysctl_lock {
int sl_lock;
int sl_want;
int sl_locked;
} memlock;
static funnel_t *
spl_kernel_funnel(void)
{
funnel_t *cfunnel;
cfunnel = thread_funnel_get();
if (cfunnel != kernel_flock) {
if (cfunnel != NULL)
thread_funnel_set(cfunnel, FALSE);
thread_funnel_set(kernel_flock, TRUE);
}
return(cfunnel);
}
static void
splx_kernel_funnel(funnel_t *saved)
{
if (saved != kernel_flock) {
thread_funnel_set(kernel_flock, FALSE);
if (saved != NULL)
thread_funnel_set(saved, TRUE);
}
}
static int sysctl_root SYSCTL_HANDLER_ARGS;
struct sysctl_oid_list sysctl__children;
void sysctl_register_oid(struct sysctl_oid *oidp)
{
struct sysctl_oid_list *parent = oidp->oid_parent;
struct sysctl_oid *p;
struct sysctl_oid *q;
int n;
funnel_t *fnl;
fnl = spl_kernel_funnel();
if (oidp->oid_number == OID_AUTO) {
n = 99;
SLIST_FOREACH(p, parent, oid_link) {
if (p->oid_number > n)
n = p->oid_number;
}
oidp->oid_number = n + 1;
}
q = NULL;
SLIST_FOREACH(p, parent, oid_link) {
if (oidp->oid_number < p->oid_number)
break;
q = p;
}
if (q)
SLIST_INSERT_AFTER(q, oidp, oid_link);
else
SLIST_INSERT_HEAD(parent, oidp, oid_link);
splx_kernel_funnel(fnl);
}
void sysctl_unregister_oid(struct sysctl_oid *oidp)
{
funnel_t *fnl;
fnl = spl_kernel_funnel();
SLIST_REMOVE(oidp->oid_parent, oidp, sysctl_oid, oid_link);
splx_kernel_funnel(fnl);
}
void sysctl_register_set(struct linker_set *lsp)
{
int count = lsp->ls_length;
int i;
for (i = 0; i < count; i++)
sysctl_register_oid((struct sysctl_oid *) lsp->ls_items[i]);
}
void sysctl_unregister_set(struct linker_set *lsp)
{
int count = lsp->ls_length;
int i;
for (i = 0; i < count; i++)
sysctl_unregister_oid((struct sysctl_oid *) lsp->ls_items[i]);
}
void sysctl_register_fixed()
{
int i;
for (i=0; newsysctl_list[i]; i++) {
sysctl_register_oid(newsysctl_list[i]);
}
for (i=0; machdep_sysctl_list[i]; i++) {
sysctl_register_oid(machdep_sysctl_list[i]);
}
}
struct linker_set sysctl_set;
void sysctl_register_all(void *arg)
{
sysctl_register_set(&sysctl_set);
}
SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0);
static void
sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
{
int k;
struct sysctl_oid *oidp;
SLIST_FOREACH(oidp, l, oid_link) {
for (k=0; k<i; k++)
printf(" ");
printf("%d %s ", oidp->oid_number, oidp->oid_name);
printf("%c%c",
oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
if (oidp->oid_handler)
printf(" *Handler");
switch (oidp->oid_kind & CTLTYPE) {
case CTLTYPE_NODE:
printf(" Node\n");
if (!oidp->oid_handler) {
sysctl_sysctl_debug_dump_node(
oidp->oid_arg1, i+2);
}
break;
case CTLTYPE_INT: printf(" Int\n"); break;
case CTLTYPE_STRING: printf(" String\n"); break;
case CTLTYPE_QUAD: printf(" Quad\n"); break;
case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
default: printf("\n");
}
}
}
static int
sysctl_sysctl_debug SYSCTL_HANDLER_ARGS
{
sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
return ENOENT;
}
SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD,
0, 0, sysctl_sysctl_debug, "-", "");
static int
sysctl_sysctl_name SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1;
u_int namelen = arg2;
int error = 0;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
char tempbuf[10];
while (namelen) {
if (!lsp) {
snprintf(tempbuf,sizeof(tempbuf),"%d",*name);
if (req->oldidx)
error = SYSCTL_OUT(req, ".", 1);
if (!error)
error = SYSCTL_OUT(req, tempbuf, strlen(tempbuf));
if (error)
return (error);
namelen--;
name++;
continue;
}
lsp2 = 0;
SLIST_FOREACH(oid, lsp, oid_link) {
if (oid->oid_number != *name)
continue;
if (req->oldidx)
error = SYSCTL_OUT(req, ".", 1);
if (!error)
error = SYSCTL_OUT(req, oid->oid_name,
strlen(oid->oid_name));
if (error)
return (error);
namelen--;
name++;
if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE)
break;
if (oid->oid_handler)
break;
lsp2 = (struct sysctl_oid_list *)oid->oid_arg1;
break;
}
lsp = lsp2;
}
return (SYSCTL_OUT(req, "", 1));
}
SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, "");
static int
sysctl_sysctl_next_ls (struct sysctl_oid_list *lsp, int *name, u_int namelen,
int *next, int *len, int level, struct sysctl_oid **oidpp)
{
struct sysctl_oid *oidp;
*len = level;
SLIST_FOREACH(oidp, lsp, oid_link) {
*next = oidp->oid_number;
*oidpp = oidp;
if (!namelen) {
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
return 0;
if (oidp->oid_handler)
return 0;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, 0, 0, next+1,
len, level+1, oidpp))
return 0;
goto next;
}
if (oidp->oid_number < *name)
continue;
if (oidp->oid_number > *name) {
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
return 0;
if (oidp->oid_handler)
return 0;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, name+1, namelen-1,
next+1, len, level+1, oidpp))
return (0);
goto next;
}
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
continue;
if (oidp->oid_handler)
continue;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, name+1, namelen-1, next+1,
len, level+1, oidpp))
return (0);
next:
namelen = 1;
*len = level;
}
return 1;
}
static int
sysctl_sysctl_next SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1;
u_int namelen = arg2;
int i, j, error;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children;
int newoid[CTL_MAXNAME];
i = sysctl_sysctl_next_ls (lsp, name, namelen, newoid, &j, 1, &oid);
if (i)
return ENOENT;
error = SYSCTL_OUT(req, newoid, j * sizeof (int));
return (error);
}
SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, "");
static int
name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp)
{
int i;
struct sysctl_oid *oidp;
struct sysctl_oid_list *lsp = &sysctl__children;
char *p;
if (!*name)
return ENOENT;
p = name + strlen(name) - 1 ;
if (*p == '.')
*p = '\0';
*len = 0;
for (p = name; *p && *p != '.'; p++)
;
i = *p;
if (i == '.')
*p = '\0';
oidp = SLIST_FIRST(lsp);
while (oidp && *len < CTL_MAXNAME) {
if (strcmp(name, oidp->oid_name)) {
oidp = SLIST_NEXT(oidp, oid_link);
continue;
}
*oid++ = oidp->oid_number;
(*len)++;
if (!i) {
if (oidpp)
*oidpp = oidp;
return (0);
}
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
break;
if (oidp->oid_handler)
break;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
oidp = SLIST_FIRST(lsp);
name = p+1;
for (p = name; *p && *p != '.'; p++)
;
i = *p;
if (i == '.')
*p = '\0';
}
return ENOENT;
}
static int
sysctl_sysctl_name2oid SYSCTL_HANDLER_ARGS
{
char *p;
int error, oid[CTL_MAXNAME], len;
struct sysctl_oid *op = 0;
if (!req->newlen)
return ENOENT;
if (req->newlen >= MAXPATHLEN)
return (ENAMETOOLONG);
MALLOC(p, char *,req->newlen+1, M_TEMP, M_WAITOK);
if (!p)
return ENOMEM;
error = SYSCTL_IN(req, p, req->newlen);
if (error) {
FREE(p, M_TEMP);
return (error);
}
p [req->newlen] = '\0';
error = name2oid(p, oid, &len, &op);
FREE(p, M_TEMP);
if (error)
return (error);
error = SYSCTL_OUT(req, oid, len * sizeof *oid);
return (error);
}
SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY|CTLFLAG_KERN, 0, 0,
sysctl_sysctl_name2oid, "I", "");
static int
sysctl_sysctl_oidfmt SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1, error;
u_int namelen = arg2;
int indx;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children;
oid = SLIST_FIRST(lsp);
indx = 0;
while (oid && indx < CTL_MAXNAME) {
if (oid->oid_number == name[indx]) {
indx++;
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
if (oid->oid_handler)
goto found;
if (indx == namelen)
goto found;
lsp = (struct sysctl_oid_list *)oid->oid_arg1;
oid = SLIST_FIRST(lsp);
} else {
if (indx != namelen)
return EISDIR;
goto found;
}
} else {
oid = SLIST_NEXT(oid, oid_link);
}
}
return ENOENT;
found:
if (!oid->oid_fmt)
return ENOENT;
error = SYSCTL_OUT(req,
&oid->oid_kind, sizeof(oid->oid_kind));
if (!error)
error = SYSCTL_OUT(req, oid->oid_fmt,
strlen(oid->oid_fmt)+1);
return (error);
}
SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, "");
int
sysctl_handle_int SYSCTL_HANDLER_ARGS
{
int error = 0;
if (arg1)
error = SYSCTL_OUT(req, arg1, sizeof(int));
else
error = SYSCTL_OUT(req, &arg2, sizeof(int));
if (error || !req->newptr)
return (error);
if (!arg1)
error = EPERM;
else
error = SYSCTL_IN(req, arg1, sizeof(int));
if (error == 0)
AUDIT_ARG(value, *(int *)arg1);
return (error);
}
int
sysctl_handle_long SYSCTL_HANDLER_ARGS
{
int error = 0;
if (!arg1)
return (EINVAL);
error = SYSCTL_OUT(req, arg1, sizeof(long));
if (error || !req->newptr)
return (error);
error = SYSCTL_IN(req, arg1, sizeof(long));
return (error);
}
int
sysctl_handle_quad SYSCTL_HANDLER_ARGS
{
int error = 0;
if (!arg1)
return (EINVAL);
error = SYSCTL_OUT(req, arg1, sizeof(long long));
if (error || !req->newptr)
return (error);
error = SYSCTL_IN(req, arg1, sizeof(long long));
return (error);
}
int
sysctl_handle_int2quad SYSCTL_HANDLER_ARGS
{
int error = 0;
long long val;
int newval;
if (!arg1)
return (EINVAL);
val = (long long)*(int *)arg1;
error = SYSCTL_OUT(req, &val, sizeof(long long));
if (error || !req->newptr)
return (error);
error = SYSCTL_IN(req, &val, sizeof(long long));
if (!error) {
newval = (int)val;
if ((long long)newval != val) {
error = ERANGE;
} else {
*(int *)arg1 = newval;
}
}
return (error);
}
int
sysctl_handle_string SYSCTL_HANDLER_ARGS
{
int error=0;
error = SYSCTL_OUT(req, arg1, strlen((char *)arg1)+1);
if (error || !req->newptr)
return (error);
if ((req->newlen - req->newidx) >= arg2) {
error = EINVAL;
} else {
arg2 = (req->newlen - req->newidx);
error = SYSCTL_IN(req, arg1, arg2);
((char *)arg1)[arg2] = '\0';
}
return (error);
}
int
sysctl_handle_opaque SYSCTL_HANDLER_ARGS
{
int error;
error = SYSCTL_OUT(req, arg1, arg2);
if (error || !req->newptr)
return (error);
error = SYSCTL_IN(req, arg1, arg2);
return (error);
}
static int
sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
{
size_t i = 0;
if (req->oldptr) {
i = l;
if (i > req->oldlen - req->oldidx)
i = req->oldlen - req->oldidx;
if (i > 0)
bcopy((void*)p, CAST_DOWN(char *, (req->oldptr + req->oldidx)), i);
}
req->oldidx += l;
if (req->oldptr && i != l)
return (ENOMEM);
return (0);
}
static int
sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
{
if (!req->newptr)
return 0;
if (req->newlen - req->newidx < l)
return (EINVAL);
bcopy(CAST_DOWN(char *, (req->newptr + req->newidx)), p, l);
req->newidx += l;
return (0);
}
int
kernel_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, void *new, size_t newlen)
{
int error = 0;
struct sysctl_req req;
funnel_t *fnl;
bzero(&req, sizeof req);
req.p = p;
if (oldlenp)
req.oldlen = *oldlenp;
if (old)
req.oldptr = CAST_USER_ADDR_T(old);
if (newlen) {
req.newlen = newlen;
req.newptr = CAST_USER_ADDR_T(new);
}
req.oldfunc = sysctl_old_kernel;
req.newfunc = sysctl_new_kernel;
req.lock = 1;
fnl = spl_kernel_funnel();
while (memlock.sl_lock) {
memlock.sl_want = 1;
(void) tsleep((caddr_t)&memlock, PRIBIO+1, "sysctl", 0);
memlock.sl_locked++;
}
memlock.sl_lock = 1;
error = sysctl_root(0, name, namelen, &req);
if (req.lock == 2)
vsunlock(req.oldptr, (user_size_t)req.oldlen, B_WRITE);
memlock.sl_lock = 0;
if (memlock.sl_want) {
memlock.sl_want = 0;
wakeup((caddr_t)&memlock);
}
splx_kernel_funnel(fnl);
if (error && error != ENOMEM)
return (error);
if (oldlenp)
*oldlenp = req.oldidx;
return (error);
}
static int
sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
{
int error = 0;
size_t i = 0;
if (req->oldptr) {
if (req->oldlen - req->oldidx < l)
return (ENOMEM);
i = l;
if (i > req->oldlen - req->oldidx)
i = req->oldlen - req->oldidx;
if (i > 0)
error = copyout((void*)p, (req->oldptr + req->oldidx), i);
}
req->oldidx += l;
if (error)
return (error);
if (req->oldptr && i < l)
return (ENOMEM);
return (0);
}
static int
sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
{
int error;
if (!req->newptr)
return 0;
if (req->newlen - req->newidx < l)
return (EINVAL);
error = copyin((req->newptr + req->newidx), p, l);
req->newidx += l;
return (error);
}
int
sysctl_root SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1;
u_int namelen = arg2;
int indx, i;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children;
int error;
oid = SLIST_FIRST(lsp);
indx = 0;
while (oid && indx < CTL_MAXNAME) {
if (oid->oid_number == name[indx]) {
indx++;
if (oid->oid_kind & CTLFLAG_NOLOCK)
req->lock = 0;
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
if (oid->oid_handler)
goto found;
if (indx == namelen)
return ENOENT;
lsp = (struct sysctl_oid_list *)oid->oid_arg1;
oid = SLIST_FIRST(lsp);
} else {
if (indx != namelen)
return EISDIR;
goto found;
}
} else {
oid = SLIST_NEXT(oid, oid_link);
}
}
return ENOENT;
found:
if (req->newptr && (!(oid->oid_kind & CTLFLAG_WR) ||
((oid->oid_kind & CTLFLAG_SECURE) && securelevel > 0))) {
return (EPERM);
}
if ((req->oldfunc == sysctl_old_kernel) && !(oid->oid_kind & CTLFLAG_KERN))
return(EPERM);
if (!(oid->oid_kind & CTLFLAG_ANYBODY) &&
req->newptr && req->p &&
(error = suser(req->p->p_ucred, &req->p->p_acflag)))
return (error);
if (!oid->oid_handler) {
return EINVAL;
}
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
i = (oid->oid_handler) (oid,
name + indx, namelen - indx,
req);
} else {
i = (oid->oid_handler) (oid,
oid->oid_arg1, oid->oid_arg2,
req);
}
return (i);
}
#ifndef _SYS_SYSPROTO_H_
struct sysctl_args {
int *name;
u_int namelen;
void *old;
size_t *oldlenp;
void *new;
size_t newlen;
};
#endif
int
new_sysctl(struct proc *p, struct sysctl_args *uap)
{
int error, i, name[CTL_MAXNAME];
size_t j;
if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
return (EINVAL);
error = copyin(CAST_USER_ADDR_T(uap->name), &name, uap->namelen * sizeof(int));
if (error)
return (error);
error = userland_sysctl(p, name, uap->namelen,
CAST_USER_ADDR_T(uap->old), uap->oldlenp, 0,
CAST_USER_ADDR_T(uap->new), uap->newlen, &j);
if (error && error != ENOMEM)
return (error);
if (uap->oldlenp) {
i = copyout(&j, CAST_USER_ADDR_T(uap->oldlenp), sizeof(j));
if (i)
return (i);
}
return (error);
}
int
userland_sysctl(struct proc *p, int *name, u_int namelen, user_addr_t oldp,
size_t *oldlenp, int inkernel, user_addr_t newp, size_t newlen,
size_t *retval)
{
int error = 0;
struct sysctl_req req, req2;
bzero(&req, sizeof req);
req.p = p;
if (oldlenp) {
if (inkernel) {
req.oldlen = *oldlenp;
} else {
error = copyin(CAST_USER_ADDR_T(oldlenp), &req.oldlen, sizeof(*oldlenp));
if (error)
return (error);
}
}
if (oldp) {
req.oldptr = oldp;
}
if (newlen) {
req.newlen = newlen;
req.newptr = newp;
}
req.oldfunc = sysctl_old_user;
req.newfunc = sysctl_new_user;
req.lock = 1;
do {
req2 = req;
error = sysctl_root(0, name, namelen, &req2);
} while (error == EAGAIN);
req = req2;
if (error && error != ENOMEM)
return (error);
if (retval) {
if (req.oldptr && req.oldidx > req.oldlen)
*retval = req.oldlen;
else
*retval = req.oldidx;
}
return (error);
}
#define KINFO_BSDI_SYSINFO (101<<8)
static int
sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen)
{
return(kernel_sysctl(current_proc(), name, namelen, oldp, oldlenp, newp, newlen));
}
static int
sysctlnametomib(const char *name, int *mibp, size_t *sizep)
{
int oid[2];
int error;
oid[0] = 0;
oid[1] = 3;
*sizep *= sizeof(int);
error = sysctl(oid, 2, mibp, sizep, (void *)name, strlen(name));
*sizep /= sizeof(int);
return(error);
}
int
sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen)
{
int oid[CTL_MAXNAME + 2];
int error;
size_t oidlen;
oidlen = CTL_MAXNAME;
error = sysctlnametomib(name, oid, &oidlen);
if (error == 0)
error = sysctl(oid, oidlen, oldp, oldlenp, newp, newlen);
return(error);
}