darling-xnu/bsd/net/net_str_id.c
2023-05-16 21:41:14 -07:00

220 lines
5.9 KiB
C

/*
* Copyright (c) 2008,2011,2019 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <sys/types.h>
#include <kern/locks.h>
#include <kern/zalloc.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <libkern/OSAtomic.h>
#include <libkern/libkern.h>
#include <net/if.h>
#include <net/if_mib.h>
#include <string.h>
#include "net/net_str_id.h"
#define NET_ID_STR_MAX_LEN 2048
#define NET_ID_STR_ENTRY_SIZE(__str) \
(__builtin_offsetof(struct net_str_id_entry, nsi_string[0]) + \
strlen(__str) + 1)
#define FIRST_NET_STR_ID 1000
static SLIST_HEAD(, net_str_id_entry) net_str_id_list = {NULL};
decl_lck_mtx_data(static, net_str_id_lock_data);
static lck_mtx_t *net_str_id_lock = &net_str_id_lock_data;
static u_int32_t nsi_kind_next[NSI_MAX_KIND] = { FIRST_NET_STR_ID, FIRST_NET_STR_ID, FIRST_NET_STR_ID };
static u_int32_t nsi_next_id = FIRST_NET_STR_ID;
extern int sysctl_if_family_ids SYSCTL_HANDLER_ARGS;
SYSCTL_DECL(_net_link_generic_system);
SYSCTL_PROC(_net_link_generic_system, OID_AUTO, if_family_ids, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
0, 0, sysctl_if_family_ids, "S, if_family_id", "Interface Family ID table");
__private_extern__ void
net_str_id_init(void)
{
lck_grp_attr_t *grp_attrib = NULL;
lck_attr_t *lck_attrb = NULL;
lck_grp_t *lck_group = NULL;
grp_attrib = lck_grp_attr_alloc_init();
lck_group = lck_grp_alloc_init("mbuf_tag_allocate_id", grp_attrib);
lck_grp_attr_free(grp_attrib);
lck_attrb = lck_attr_alloc_init();
lck_mtx_init(net_str_id_lock, lck_group, lck_attrb);
lck_grp_free(lck_group);
lck_attr_free(lck_attrb);
}
__private_extern__ void
net_str_id_first_last(u_int32_t *first, u_int32_t *last, u_int32_t kind)
{
*first = FIRST_NET_STR_ID;
switch (kind) {
case NSI_MBUF_TAG:
case NSI_VENDOR_CODE:
case NSI_IF_FAM_ID:
*last = nsi_kind_next[kind] - 1;
break;
default:
*last = FIRST_NET_STR_ID - 1;
break;
}
}
__private_extern__ errno_t
net_str_id_find_internal(const char *string, u_int32_t *out_id,
u_int32_t kind, int create)
{
struct net_str_id_entry *entry = NULL;
if (string == NULL || out_id == NULL || kind >= NSI_MAX_KIND) {
return EINVAL;
}
if (strlen(string) > NET_ID_STR_MAX_LEN) {
return EINVAL;
}
*out_id = 0;
/* Look for an existing entry */
lck_mtx_lock(net_str_id_lock);
SLIST_FOREACH(entry, &net_str_id_list, nsi_next) {
if (strcmp(string, entry->nsi_string) == 0) {
break;
}
}
if (entry == NULL) {
if (create == 0) {
lck_mtx_unlock(net_str_id_lock);
return ENOENT;
}
entry = zalloc_permanent(NET_ID_STR_ENTRY_SIZE(string),
ZALIGN_PTR);
if (entry == NULL) {
lck_mtx_unlock(net_str_id_lock);
return ENOMEM;
}
strlcpy(entry->nsi_string, string, strlen(string) + 1);
entry->nsi_flags = (1 << kind);
entry->nsi_id = nsi_next_id++;
nsi_kind_next[kind] = nsi_next_id;
SLIST_INSERT_HEAD(&net_str_id_list, entry, nsi_next);
} else if ((entry->nsi_flags & (1 << kind)) == 0) {
if (create == 0) {
lck_mtx_unlock(net_str_id_lock);
return ENOENT;
}
entry->nsi_flags |= (1 << kind);
if (entry->nsi_id >= nsi_kind_next[kind]) {
nsi_kind_next[kind] = entry->nsi_id + 1;
}
}
lck_mtx_unlock(net_str_id_lock);
*out_id = entry->nsi_id;
return 0;
}
#define ROUNDUP32(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t))
int
sysctl_if_family_ids SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
{
#pragma unused(oidp)
#pragma unused(arg1)
#pragma unused(arg2)
errno_t error = 0;
struct net_str_id_entry *entry = NULL;
struct if_family_id *iffmid = NULL;
size_t max_size = 0;
lck_mtx_lock(net_str_id_lock);
SLIST_FOREACH(entry, &net_str_id_list, nsi_next) {
size_t str_size;
size_t iffmid_size;
if ((entry->nsi_flags & (1 << NSI_IF_FAM_ID)) == 0) {
continue;
}
str_size = strlen(entry->nsi_string);
if (str_size > NET_ID_STR_MAX_LEN) {
str_size = NET_ID_STR_MAX_LEN;
}
str_size += 1; // make room for end-of-string
iffmid_size = ROUNDUP32(offsetof(struct net_str_id_entry, nsi_string) + str_size);
if (iffmid_size > max_size) {
if (iffmid) {
_FREE(iffmid, M_TEMP);
}
iffmid = _MALLOC(iffmid_size, M_TEMP, M_WAITOK);
if (iffmid == NULL) {
lck_mtx_unlock(net_str_id_lock);
error = ENOMEM;
goto done;
}
max_size = iffmid_size;
}
bzero(iffmid, iffmid_size);
iffmid->iffmid_len = (uint32_t)iffmid_size;
iffmid->iffmid_id = entry->nsi_id;
strlcpy(iffmid->iffmid_str, entry->nsi_string, str_size);
error = SYSCTL_OUT(req, iffmid, iffmid_size);
if (error) {
lck_mtx_unlock(net_str_id_lock);
goto done;
}
}
lck_mtx_unlock(net_str_id_lock);
done:
if (iffmid) {
_FREE(iffmid, M_TEMP);
}
return error;
}