diff options
Diffstat (limited to 'cpukit/libnetworking/kern/kern_sysctl.c')
| -rw-r--r-- | cpukit/libnetworking/kern/kern_sysctl.c | 1541 |
1 files changed, 1541 insertions, 0 deletions
diff --git a/cpukit/libnetworking/kern/kern_sysctl.c b/cpukit/libnetworking/kern/kern_sysctl.c new file mode 100644 index 0000000000..993c20f5d2 --- /dev/null +++ b/cpukit/libnetworking/kern/kern_sysctl.c @@ -0,0 +1,1541 @@ +/*- + * Copyright (c) 1982, 1986, 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Mike Karels at Berkeley Software Design, Inc. + * + * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD + * project, to make these variables more userfriendly. + * + * 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. + * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. + * + * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 + * $FreeBSD: src/sys/kern/kern_sysctl.c,v 1.135 2002/10/27 07:12:34 rwatson Exp $ + */ + +#include "opt_compat.h" +#include "opt_mac.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/sysctl.h> +#include <sys/malloc.h> +#include <sys/proc.h> +#ifndef __rtems__ +#include <sys/mac.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/sx.h> +#include <sys/sysproto.h> +#else +#include <sys/queue.h> + +#include <stdio.h> /* for snprintf() */ +size_t strlcpy(char *, const char *, size_t); +#endif +#include <vm/vm.h> +#include <vm/vm_extern.h> + +#ifndef __rtems__ +static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); +static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); +static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); +#else +/* + * Currently these mean nothing on RTEMS. + */ +#define M_SYSCTLOID 1 +#define M_SYSCTLTMP 2 +#define M_ZERO 0 + +#define mtx_lock(l) +#define mtx_unlock(l) + +#endif + +#ifndef __rtems__ +/* + * Locking - this locks the sysctl tree in memory. + */ +static struct sx sysctllock; +#endif + +#ifdef __rtems__ +#define SYSCTL_LOCK() +#define SYSCTL_UNLOCK() +#define SYSCTL_INIT() +#else +#define SYSCTL_LOCK() sx_xlock(&sysctllock) +#define SYSCTL_UNLOCK() sx_xunlock(&sysctllock) +#define SYSCTL_INIT() sx_init(&sysctllock, "sysctl lock") +#endif + +static int sysctl_root(SYSCTL_HANDLER_ARGS); + +struct sysctl_oid_list sysctl__children; /* root list */ + +static struct sysctl_oid * +sysctl_find_oidname(const char *name, struct sysctl_oid_list *list) +{ + struct sysctl_oid *oidp; + + SLIST_FOREACH(oidp, list, oid_link) { + if (strcmp(oidp->oid_name, name) == 0) { + return (oidp); + } + } + return (NULL); +} + +/* + * Initialization of the MIB tree. + * + * Order by number in each list. + */ + +void +sysctl_register_oid(struct sysctl_oid *oidp) +{ + struct sysctl_oid_list *parent = oidp->oid_parent; + struct sysctl_oid *p; + struct sysctl_oid *q; + + /* + * First check if another oid with the same name already + * exists in the parent's list. + */ + p = sysctl_find_oidname(oidp->oid_name, parent); + if (p != NULL) { + if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { + p->oid_refcnt++; + return; + } else { + printf("can't re-use a leaf (%s)!\n", p->oid_name); + return; + } + } + /* + * If this oid has a number OID_AUTO, give it a number which + * is greater than any current oid. + * NOTE: DO NOT change the starting value here, change it in + * <sys/sysctl.h>, and make sure it is at least 256 to + * accomodate e.g. net.inet.raw as a static sysctl node. + */ + if (oidp->oid_number == OID_AUTO) { + static int32_t newoid = CTL_AUTO_START; + + oidp->oid_number = newoid++; + if (newoid == 0x7fffffff) + panic("out of oids"); + } +#if 0 + else if (oidp->oid_number >= CTL_AUTO_START) { + /* do not panic; this happens when unregistering sysctl sets */ + printf("static sysctl oid too high: %d", oidp->oid_number); + } +#endif + + /* + * Insert the oid into the parent's list in order. + */ + 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); +} + +void +sysctl_unregister_oid(struct sysctl_oid *oidp) +{ + SLIST_REMOVE(oidp->oid_parent, oidp, sysctl_oid, oid_link); +} + +/* Initialize a new context to keep track of dynamically added sysctls. */ +int +sysctl_ctx_init(struct sysctl_ctx_list *c) +{ + + if (c == NULL) { + return (EINVAL); + } + TAILQ_INIT(c); + return (0); +} + +/* Free the context, and destroy all dynamic oids registered in this context */ +int +sysctl_ctx_free(struct sysctl_ctx_list *clist) +{ + struct sysctl_ctx_entry *e, *e1; + int error; + + error = 0; + /* + * First perform a "dry run" to check if it's ok to remove oids. + * XXX FIXME + * XXX This algorithm is a hack. But I don't know any + * XXX better solution for now... + */ + TAILQ_FOREACH(e, clist, link) { + error = sysctl_remove_oid(e->entry, 0, 0); + if (error) + break; + } + /* + * Restore deregistered entries, either from the end, + * or from the place where error occured. + * e contains the entry that was not unregistered + */ + if (error) + e1 = TAILQ_PREV(e, sysctl_ctx_list, link); + else + e1 = TAILQ_LAST(clist, sysctl_ctx_list); + while (e1 != NULL) { + sysctl_register_oid(e1->entry); + e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); + } + if (error) + return(EBUSY); + /* Now really delete the entries */ + e = TAILQ_FIRST(clist); + while (e != NULL) { + e1 = TAILQ_NEXT(e, link); + error = sysctl_remove_oid(e->entry, 1, 0); + if (error) + panic("sysctl_remove_oid: corrupt tree, entry: %s", + e->entry->oid_name); + free(e, M_SYSCTLOID); + e = e1; + } + return (error); +} + +/* Add an entry to the context */ +struct sysctl_ctx_entry * +sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) +{ + struct sysctl_ctx_entry *e; + + if (clist == NULL || oidp == NULL) + return(NULL); + e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); + e->entry = oidp; + TAILQ_INSERT_HEAD(clist, e, link); + return (e); +} + +/* Find an entry in the context */ +struct sysctl_ctx_entry * +sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) +{ + struct sysctl_ctx_entry *e; + + if (clist == NULL || oidp == NULL) + return(NULL); + TAILQ_FOREACH(e, clist, link) { + if(e->entry == oidp) + return(e); + } + return (e); +} + +/* + * Delete an entry from the context. + * NOTE: this function doesn't free oidp! You have to remove it + * with sysctl_remove_oid(). + */ +int +sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) +{ + struct sysctl_ctx_entry *e; + + if (clist == NULL || oidp == NULL) + return (EINVAL); + e = sysctl_ctx_entry_find(clist, oidp); + if (e != NULL) { + TAILQ_REMOVE(clist, e, link); + free(e, M_SYSCTLOID); + return (0); + } else + return (ENOENT); +} + +/* + * Remove dynamically created sysctl trees. + * oidp - top of the tree to be removed + * del - if 0 - just deregister, otherwise free up entries as well + * recurse - if != 0 traverse the subtree to be deleted + */ +int +sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) +{ + struct sysctl_oid *p; + int error; + + if (oidp == NULL) + return(EINVAL); + if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { + printf("can't remove non-dynamic nodes!\n"); + return (EINVAL); + } + /* + * WARNING: normal method to do this should be through + * sysctl_ctx_free(). Use recursing as the last resort + * method to purge your sysctl tree of leftovers... + * However, if some other code still references these nodes, + * it will panic. + */ + if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { + if (oidp->oid_refcnt == 1) { + SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) { + if (!recurse) + return (ENOTEMPTY); + error = sysctl_remove_oid(p, del, recurse); + if (error) + return (error); + } + if (del) + free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); + } + } + if (oidp->oid_refcnt > 1 ) { + oidp->oid_refcnt--; + } else { + if (oidp->oid_refcnt == 0) { + printf("Warning: bad oid_refcnt=%u (%s)!\n", + oidp->oid_refcnt, oidp->oid_name); + return (EINVAL); + } + sysctl_unregister_oid(oidp); + if (del) { + if (oidp->descr) + free((void *)(uintptr_t)(const void *)oidp->descr, M_SYSCTLOID); + free((void *)(uintptr_t)(const void *)oidp->oid_name, + M_SYSCTLOID); + free(oidp, M_SYSCTLOID); + } + } + return (0); +} + +/* + * Create new sysctls at run time. + * clist may point to a valid context initialized with sysctl_ctx_init(). + */ +struct sysctl_oid * +sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, + int number, const char *name, int kind, void *arg1, int arg2, + int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) +{ + struct sysctl_oid *oidp; + ssize_t len; + char *newname; + + /* You have to hook up somewhere.. */ + if (parent == NULL) + return(NULL); + /* Check if the node already exists, otherwise create it */ + oidp = sysctl_find_oidname(name, parent); + if (oidp != NULL) { + if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { + oidp->oid_refcnt++; + /* Update the context */ + if (clist != NULL) + sysctl_ctx_entry_add(clist, oidp); + return (oidp); + } else { + printf("can't re-use a leaf (%s)!\n", name); + return (NULL); + } + } + oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); + oidp->oid_parent = parent; + SLIST_NEXT(oidp, oid_link) = NULL; + oidp->oid_number = number; + oidp->oid_refcnt = 1; + len = strlen(name); + newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); + bcopy(name, newname, len + 1); + newname[len] = '\0'; + oidp->oid_name = newname; + oidp->oid_handler = handler; + oidp->oid_kind = CTLFLAG_DYN | kind; + if ((kind & CTLTYPE) == CTLTYPE_NODE) { + /* Allocate space for children */ + SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list), + M_SYSCTLOID, M_WAITOK)); + SLIST_INIT(SYSCTL_CHILDREN(oidp)); + } else { + oidp->oid_arg1 = arg1; + oidp->oid_arg2 = arg2; + } + oidp->oid_fmt = fmt; + if (descr) { + int len = strlen(descr) + 1; + oidp->descr = malloc(len, M_SYSCTLOID, M_WAITOK); + if (oidp->descr) + strcpy((char *)(uintptr_t)(const void *)oidp->descr, descr); + } + /* Update the context, if used */ + if (clist != NULL) + sysctl_ctx_entry_add(clist, oidp); + /* Register this oid */ + sysctl_register_oid(oidp); + return (oidp); +} + +/* + * Register the kernel's oids on startup. + */ +SET_DECLARE(sysctl_set, struct sysctl_oid); + +#if defined(__rtems__) +void +#else +static void +#endif +sysctl_register_all(void *arg) +{ + struct sysctl_oid **oidp; + + SYSCTL_INIT(); + SET_FOREACH(oidp, sysctl_set) + sysctl_register_oid(*oidp); +} +SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); + +/* + * "Staff-functions" + * + * These functions implement a presently undocumented interface + * used by the sysctl program to walk the tree, and get the type + * so it can print the value. + * This interface is under work and consideration, and should probably + * be killed with a big axe by the first person who can find the time. + * (be aware though, that the proper interface isn't as obvious as it + * may seem, there are various conflicting requirements. + * + * {0,0} printf the entire MIB-tree. + * {0,1,...} return the name of the "..." OID. + * {0,2,...} return the next OID. + * {0,3} return the OID of the name in "new" + * {0,4,...} return the kind & format info for the "..." OID. + * {0,5,...} return the description the "..." OID. + */ + +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) +{ +#ifndef __rtems__ + int error; + + error = suser(req->td); + if (error) + return error; +#endif + 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 buf[10]; + + while (namelen) { + if (!lsp) { + snprintf(buf,sizeof(buf),"%d",*name); + if (req->oldidx) + error = SYSCTL_OUT(req, ".", 1); + if (!error) + error = SYSCTL_OUT(req, buf, strlen(buf)); + 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 (oidp->oid_kind & CTLFLAG_SKIP) + continue; + + if (!namelen) { + if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) + return 0; + if (oidp->oid_handler) + /* We really should call the handler here...*/ + 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 emptynode; + } + + 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; + emptynode: + *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=0; + struct sysctl_oid *op = 0; + + if (!req->newlen) + return ENOENT; + if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ + return (ENAMETOOLONG); + + p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); + + error = SYSCTL_IN(req, p, req->newlen); + if (error) { + free(p, M_SYSCTL); + return (error); + } + + p [req->newlen] = '\0'; + + error = name2oid(p, oid, &len, &op); + + free(p, M_SYSCTL); + + if (error) + return (error); + + error = SYSCTL_OUT(req, oid, len * sizeof *oid); + return (error); +} + +SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, + sysctl_sysctl_name2oid, "I", ""); + +static int +sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) +{ + struct sysctl_oid *oid; + int error; + + error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); + if (error) + return (error); + + if (!oid->oid_fmt) + return (ENOENT); + error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); + if (error) + return (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, ""); + +static int +sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) +{ + struct sysctl_oid *oid; + int error; + + error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); + if (error) + return (error); + + if (!oid->descr) + return (ENOENT); + error = SYSCTL_OUT(req, oid->descr, strlen(oid->descr) + 1); + return (error); +} + +SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, ""); + +/* + * Default "handler" functions. + */ + +/* + * Handle an int, signed or unsigned. + * Two cases: + * a variable: point arg1 at it. + * a constant: pass it in arg2. + */ + +int +sysctl_handle_int(SYSCTL_HANDLER_ARGS) +{ + int tmpout, error = 0; + + /* + * Attempt to get a coherent snapshot by making a copy of the data. + */ + if (arg1) + tmpout = *(int *)arg1; + else + tmpout = arg2; + error = SYSCTL_OUT(req, &tmpout, sizeof(int)); + + if (error || !req->newptr) + return (error); + + if (!arg1) + error = EPERM; + else + error = SYSCTL_IN(req, arg1, sizeof(int)); + return (error); +} + +/* + * Handle a long, signed or unsigned. arg1 points to it. + */ + +int +sysctl_handle_long(SYSCTL_HANDLER_ARGS) +{ + int error = 0; + long tmpout; + + /* + * Attempt to get a coherent snapshot by making a copy of the data. + */ + if (!arg1) + return (EINVAL); + tmpout = *(long *)arg1; + error = SYSCTL_OUT(req, &tmpout, sizeof(long)); + + if (error || !req->newptr) + return (error); + + error = SYSCTL_IN(req, arg1, sizeof(long)); + return (error); +} + +/* + * Handle our generic '\0' terminated 'C' string. + * Two cases: + * a variable string: point arg1 at it, arg2 is max length. + * a constant string: point arg1 at it, arg2 is zero. + */ + +int +sysctl_handle_string(SYSCTL_HANDLER_ARGS) +{ + int error=0; + char *tmparg; + size_t outlen; + + /* + * Attempt to get a coherent snapshot by copying to a + * temporary kernel buffer. + */ +retry: + outlen = strlen((char *)arg1)+1; + tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); + + if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { + free(tmparg, M_SYSCTLTMP); + goto retry; + } + + error = SYSCTL_OUT(req, tmparg, outlen); + free(tmparg, M_SYSCTLTMP); + + 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); +} + +/* + * Handle any kind of opaque data. + * arg1 points to it, arg2 is the size. + */ + +int +sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) +{ + int error; + void *tmparg; + + /* + * Attempt to get a coherent snapshot, either by wiring the + * user space buffer or copying to a temporary kernel buffer + * depending on the size of the data. + */ + if (arg2 > PAGE_SIZE) { + sysctl_wire_old_buffer(req, arg2); + error = SYSCTL_OUT(req, arg1, arg2); + } else { + tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK); + bcopy(arg1, tmparg, arg2); + error = SYSCTL_OUT(req, tmparg, arg2); + free(tmparg, M_SYSCTLTMP); + } + + if (error || !req->newptr) + return (error); + + error = SYSCTL_IN(req, arg1, arg2); + + return (error); +} + +/* + * Transfer functions to/from kernel space. + * XXX: rather untested at this point + */ +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 (req->oldlen <= req->oldidx) + i = 0; + else + if (i > req->oldlen - req->oldidx) + i = req->oldlen - req->oldidx; + if (i > 0) + bcopy(p, (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((char *)req->newptr + req->newidx, p, l); + req->newidx += l; + return (0); +} + +int +kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, + size_t *oldlenp, void *new, size_t newlen, size_t *retval) +{ + int error = 0; + struct sysctl_req req; + + bzero(&req, sizeof req); + + req.td = td; + + if (oldlenp) { + req.oldlen = *oldlenp; + } + + if (old) { + req.oldptr= old; + } + + if (new != NULL) { + req.newlen = newlen; + req.newptr = new; + } + + req.oldfunc = sysctl_old_kernel; + req.newfunc = sysctl_new_kernel; + req.lock = REQ_LOCKED; + + SYSCTL_LOCK(); + + error = sysctl_root(0, name, namelen, &req); + + if (req.lock == REQ_WIRED) +#ifdef __rtems__ + printf ("kern_sysctl: vsunlock needs to be called!\n"); +#else + vsunlock(req.oldptr, req.oldlen); +#endif + + SYSCTL_UNLOCK(); + + if (error && error != ENOMEM) + return (error); + + if (retval) { + if (req.oldptr && req.oldidx > req.oldlen) + *retval = req.oldlen; + else + *retval = req.oldidx; + } + return (error); +} + +int +kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, + void *new, size_t newlen, size_t *retval) +{ + int oid[CTL_MAXNAME]; + size_t oidlen, plen; + int error; + + plen = 0; /* RTEMS - to avoid warnings */ + + oid[0] = 0; /* sysctl internal magic */ + oid[1] = 3; /* name2oid */ + oidlen = sizeof(oid); + + error = kernel_sysctl(td, oid, 2, oid, &oidlen, + (void *)name, strlen(name), &plen); + if (error) + return (error); + + error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, + new, newlen, retval); + return (error); +} + +/* + * Transfer function to/from user space. + */ +static int +sysctl_old_user(struct sysctl_req *req, const void *p, size_t l) +{ + int error = 0; + size_t i = 0; + +#ifndef __rtems__ + if (req->lock == 1 && req->oldptr) + WITNESS_SLEEP(1, NULL); +#endif + if (req->oldptr) { + i = l; + if (req->oldlen <= req->oldidx) + i = 0; + else + if (i > req->oldlen - req->oldidx) + i = req->oldlen - req->oldidx; + if (i > 0) + error = copyout(p, (char *)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((char *)req->newptr + req->newidx, p, l); + req->newidx += l; + return (error); +} + +/* + * Wire the user space destination buffer. If set to a value greater than + * zero, the len parameter limits the maximum amount of wired memory. + * + * XXX - The len parameter is currently ignored due to the lack of + * a place to save it in the sysctl_req structure so that the matching + * amount of memory can be unwired in the sysctl exit code. + */ +int +sysctl_wire_old_buffer(struct sysctl_req *req, size_t len) +{ + if (req->lock == REQ_LOCKED && req->oldptr && + req->oldfunc == sysctl_old_user) { +#ifndef __rtems__ + vslock(req->oldptr, req->oldlen); +#endif + req->lock = REQ_WIRED; + } + return (0); +} + +int +sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, + int *nindx, struct sysctl_req *req) +{ + struct sysctl_oid *oid; + int indx; + + oid = SLIST_FIRST(&sysctl__children); + indx = 0; + while (oid && indx < CTL_MAXNAME) { + if (oid->oid_number == name[indx]) { + indx++; + if (oid->oid_kind & CTLFLAG_NOLOCK) + req->lock = REQ_UNLOCKED; + if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { + if (oid->oid_handler != NULL || + indx == namelen) { + *noid = oid; + if (nindx != NULL) + *nindx = indx; + return (0); + } + oid = SLIST_FIRST( + (struct sysctl_oid_list *)oid->oid_arg1); + } else if (indx == namelen) { + *noid = oid; + if (nindx != NULL) + *nindx = indx; + return (0); + } else { + return (ENOTDIR); + } + } else { + oid = SLIST_NEXT(oid, oid_link); + } + } + return (ENOENT); +} + +/* + * Traverse our tree, and find the right node, execute whatever it points + * to, and return the resulting error code. + */ + +static int +sysctl_root(SYSCTL_HANDLER_ARGS) +{ + struct sysctl_oid *oid; + int error, indx; + + error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); + if (error) + return (error); + + if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { + /* + * You can't call a sysctl when it's a node, but has + * no handler. Inform the user that it's a node. + * The indx may or may not be the same as namelen. + */ + if (oid->oid_handler == NULL) + return (EISDIR); + } + + /* Is this sysctl writable? */ + if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) + return (EPERM); + +#ifndef __rtems__ + KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); + + /* Is this sysctl sensitive to securelevels? */ + if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { + error = securelevel_gt(req->td->td_ucred, 0); + if (error) + return (error); + } + + /* Is this sysctl writable by only privileged users? */ + if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { + int flags; + + if (oid->oid_kind & CTLFLAG_PRISON) + flags = PRISON_ROOT; + else + flags = 0; + error = suser_cred(req->td->td_ucred, flags); + if (error) + return (error); + } +#endif + + if (!oid->oid_handler) + return EINVAL; + + if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) + error = oid->oid_handler(oid, (int *)arg1 + indx, arg2 - indx, + req); + else + error = oid->oid_handler(oid, oid->oid_arg1, oid->oid_arg2, + req); + return (error); +} + +#ifndef _SYS_SYSPROTO_H_ +struct sysctl_args { + int *name; + u_int namelen; + void *old; + size_t *oldlenp; + void *new; + size_t newlen; +}; +#endif + +/* + * MPSAFE + */ +int +__sysctl(struct thread *td, struct sysctl_args *uap) +{ + int error, name[CTL_MAXNAME]; + size_t j; + + if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) + return (EINVAL); + + error = copyin(uap->name, &name, uap->namelen * sizeof(int)); + if (error) + return (error); + + mtx_lock(&Giant); + + error = userland_sysctl(td, name, uap->namelen, + uap->old, uap->oldlenp, 0, + uap->new, uap->newlen, &j); + if (error && error != ENOMEM) + goto done2; + if (uap->oldlenp) { + int i = copyout(&j, uap->oldlenp, sizeof(j)); + if (i) + error = i; + } +done2: + mtx_unlock(&Giant); + return (error); +} + +/* + * This is used from various compatibility syscalls too. That's why name + * must be in kernel space. + */ +int +userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, + size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval) +{ + int error = 0; + struct sysctl_req req, req2; + + bzero(&req, sizeof req); + + req.td = td; + + if (oldlenp) { + if (inkernel) { + req.oldlen = *oldlenp; + } else { + error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); + if (error) + return (error); + } + } + + if (old) { +#ifndef __rtems__ + if (!useracc(old, req.oldlen, VM_PROT_WRITE)) + return (EFAULT); +#endif + req.oldptr= old; + } + + if (new != NULL) { +#ifndef __rtems__ + if (!useracc(new, req.newlen, VM_PROT_READ)) + return (EFAULT); +#endif + req.newlen = newlen; + req.newptr = new; + } + + req.oldfunc = sysctl_old_user; + req.newfunc = sysctl_new_user; + req.lock = REQ_LOCKED; + + SYSCTL_LOCK(); + +#ifdef MAC + error = mac_check_system_sysctl(td->td_ucred, name, namelen, old, + oldlenp, inkernel, new, newlen); + if (error) { + SYSCTL_UNLOCK(); + return (error); + } +#endif + + do { + req2 = req; + error = sysctl_root(0, name, namelen, &req2); + } while (error == EAGAIN); + + req = req2; +#ifndef __rtems__ + if (req.lock == REQ_WIRED) + vsunlock(req.oldptr, req.oldlen); +#endif + + SYSCTL_UNLOCK(); + + if (error && error != ENOMEM) + return (error); + + if (retval) { + if (req.oldptr && req.oldidx > req.oldlen) + *retval = req.oldlen; + else + *retval = req.oldidx; + } + return (error); +} + +#ifdef COMPAT_43 +#include <sys/socket.h> +#include <vm/vm_param.h> + +#define KINFO_PROC (0<<8) +#define KINFO_RT (1<<8) +#define KINFO_VNODE (2<<8) +#define KINFO_FILE (3<<8) +#define KINFO_METER (4<<8) +#define KINFO_LOADAVG (5<<8) +#define KINFO_CLOCKRATE (6<<8) + +/* Non-standard BSDI extension - only present on their 4.3 net-2 releases */ +#define KINFO_BSDI_SYSINFO (101<<8) + +/* + * XXX this is bloat, but I hope it's better here than on the potentially + * limited kernel stack... -Peter + */ + +static struct { + int bsdi_machine; /* "i386" on BSD/386 */ +/* ^^^ this is an offset to the string, relative to the struct start */ + char *pad0; + long pad1; + long pad2; + long pad3; + u_long pad4; + u_long pad5; + u_long pad6; + + int bsdi_ostype; /* "BSD/386" on BSD/386 */ + int bsdi_osrelease; /* "1.1" on BSD/386 */ + long pad7; + long pad8; + char *pad9; + + long pad10; + long pad11; + int pad12; + long pad13; + quad_t pad14; + long pad15; + + struct timeval pad16; + /* we dont set this, because BSDI's uname used gethostname() instead */ + int bsdi_hostname; /* hostname on BSD/386 */ + + /* the actual string data is appended here */ + +} bsdi_si; +/* + * this data is appended to the end of the bsdi_si structure during copyout. + * The "char *" offsets are relative to the base of the bsdi_si struct. + * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings + * should not exceed the length of the buffer here... (or else!! :-) + */ +static char bsdi_strings[80]; /* It had better be less than this! */ + +#ifndef _SYS_SYSPROTO_H_ +struct getkerninfo_args { + int op; + char *where; + size_t *size; + int arg; +}; +#endif + +/* + * MPSAFE + */ +int +ogetkerninfo(struct thread *td, struct getkerninfo_args *uap) +{ + int error, name[6]; + size_t size; + u_int needed = 0; + + mtx_lock(&Giant); + + switch (uap->op & 0xff00) { + + case KINFO_RT: + name[0] = CTL_NET; + name[1] = PF_ROUTE; + name[2] = 0; + name[3] = (uap->op & 0xff0000) >> 16; + name[4] = uap->op & 0xff; + name[5] = uap->arg; + error = userland_sysctl(td, name, 6, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_VNODE: + name[0] = CTL_KERN; + name[1] = KERN_VNODE; + error = userland_sysctl(td, name, 2, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_PROC: + name[0] = CTL_KERN; + name[1] = KERN_PROC; + name[2] = uap->op & 0xff; + name[3] = uap->arg; + error = userland_sysctl(td, name, 4, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_FILE: + name[0] = CTL_KERN; + name[1] = KERN_FILE; + error = userland_sysctl(td, name, 2, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_METER: + name[0] = CTL_VM; + name[1] = VM_TOTAL; + error = userland_sysctl(td, name, 2, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_LOADAVG: + name[0] = CTL_VM; + name[1] = VM_LOADAVG; + error = userland_sysctl(td, name, 2, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_CLOCKRATE: + name[0] = CTL_KERN; + name[1] = KERN_CLOCKRATE; + error = userland_sysctl(td, name, 2, uap->where, uap->size, + 0, 0, 0, &size); + break; + + case KINFO_BSDI_SYSINFO: { + /* + * this is pretty crude, but it's just enough for uname() + * from BSDI's 1.x libc to work. + * + * *size gives the size of the buffer before the call, and + * the amount of data copied after a successful call. + * If successful, the return value is the amount of data + * available, which can be larger than *size. + * + * BSDI's 2.x product apparently fails with ENOMEM if *size + * is too small. + */ + + u_int left; + char *s; + + bzero((char *)&bsdi_si, sizeof(bsdi_si)); + bzero(bsdi_strings, sizeof(bsdi_strings)); + + s = bsdi_strings; + + bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si); + strcpy(s, ostype); + s += strlen(s) + 1; + + bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si); + strcpy(s, osrelease); + s += strlen(s) + 1; + + bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si); + strcpy(s, machine); + s += strlen(s) + 1; + + needed = sizeof(bsdi_si) + (s - bsdi_strings); + + if ((uap->where == NULL) || (uap->size == NULL)) { + /* process is asking how much buffer to supply.. */ + size = needed; + error = 0; + break; + } + + if ((error = copyin(uap->size, &size, sizeof(size))) != 0) + break; + + /* if too much buffer supplied, trim it down */ + if (size > needed) + size = needed; + + /* how much of the buffer is remaining */ + left = size; + + if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0) + break; + + /* is there any point in continuing? */ + if (left > sizeof(bsdi_si)) { + left -= sizeof(bsdi_si); + error = copyout(&bsdi_strings, + uap->where + sizeof(bsdi_si), left); + } + break; + } + + default: + error = EOPNOTSUPP; + break; + } + if (error == 0) { + td->td_retval[0] = needed ? needed : size; + if (uap->size) { + error = copyout(&size, uap->size, sizeof(size)); + } + } + mtx_unlock(&Giant); + return (error); +} +#endif /* COMPAT_43 */ |