1/*
2 * Copyright (c) 2008,2011 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29#include <sys/types.h>
30#include <kern/locks.h>
31#include <kern/kalloc.h>
32#include <sys/errno.h>
33#include <sys/sysctl.h>
34#include <sys/malloc.h>
35#include <sys/socket.h>
36#include <libkern/OSAtomic.h>
37#include <libkern/libkern.h>
38#include <net/if.h>
39#include <net/if_mib.h>
40#include <string.h>
41
42#include "net/net_str_id.h"
43
44#define	NET_ID_STR_ENTRY_SIZE(__str) \
45	((size_t)&(((struct net_str_id_entry*)0)->nsi_string[0]) + \
46	strlen(__str) + 1)
47
48#define	FIRST_NET_STR_ID				1000
49static SLIST_HEAD(,net_str_id_entry)	net_str_id_list = {NULL};
50decl_lck_mtx_data(static, net_str_id_lock_data);
51static lck_mtx_t	*net_str_id_lock = &net_str_id_lock_data;
52
53static u_int32_t nsi_kind_next[NSI_MAX_KIND] = { FIRST_NET_STR_ID, FIRST_NET_STR_ID, FIRST_NET_STR_ID };
54static u_int32_t nsi_next_id = FIRST_NET_STR_ID;
55
56extern int sysctl_if_family_ids SYSCTL_HANDLER_ARGS;
57
58SYSCTL_DECL(_net_link_generic_system);
59
60SYSCTL_PROC(_net_link_generic_system, OID_AUTO, if_family_ids, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
61	0, 0, sysctl_if_family_ids, "S, if_family_id", "Interface Family ID table");
62
63__private_extern__ void
64net_str_id_init(void)
65{
66	lck_grp_attr_t	*grp_attrib = NULL;
67	lck_attr_t		*lck_attrb = NULL;
68	lck_grp_t		*lck_group = NULL;
69
70	grp_attrib = lck_grp_attr_alloc_init();
71	lck_group = lck_grp_alloc_init("mbuf_tag_allocate_id", grp_attrib);
72	lck_grp_attr_free(grp_attrib);
73	lck_attrb = lck_attr_alloc_init();
74
75	lck_mtx_init(net_str_id_lock, lck_group, lck_attrb);
76
77	lck_grp_free(lck_group);
78	lck_attr_free(lck_attrb);
79}
80
81__private_extern__ void
82net_str_id_first_last(u_int32_t *first, u_int32_t *last, u_int32_t kind)
83{
84	*first = FIRST_NET_STR_ID;
85
86	switch (kind) {
87		case NSI_MBUF_TAG:
88		case NSI_VENDOR_CODE:
89		case NSI_IF_FAM_ID:
90			*last = nsi_kind_next[kind] - 1;
91			break;
92		default:
93			*last = FIRST_NET_STR_ID - 1;
94			break;
95	}
96}
97
98__private_extern__ errno_t
99net_str_id_find_internal(const char	*string, u_int32_t *out_id,
100						  u_int32_t	kind, int create)
101{
102	struct net_str_id_entry			*entry = NULL;
103
104
105	if (string == NULL || out_id == NULL || kind >= NSI_MAX_KIND)
106		return EINVAL;
107
108	*out_id = 0;
109
110	/* Look for an existing entry */
111	lck_mtx_lock(net_str_id_lock);
112	SLIST_FOREACH(entry, &net_str_id_list, nsi_next) {
113		if (strcmp(string, entry->nsi_string) == 0) {
114			break;
115		}
116	}
117
118	if (entry == NULL) {
119		if (create == 0) {
120			lck_mtx_unlock(net_str_id_lock);
121			return ENOENT;
122		}
123
124		entry = kalloc(NET_ID_STR_ENTRY_SIZE(string));
125		if (entry == NULL) {
126			lck_mtx_unlock(net_str_id_lock);
127			return ENOMEM;
128		}
129
130		strlcpy(entry->nsi_string, string, strlen(string) + 1);
131		entry->nsi_flags = (1 << kind);
132		entry->nsi_id = nsi_next_id++;
133		nsi_kind_next[kind] = nsi_next_id;
134		SLIST_INSERT_HEAD(&net_str_id_list, entry, nsi_next);
135	} else if ((entry->nsi_flags & (1 << kind)) == 0) {
136		if (create == 0) {
137			lck_mtx_unlock(net_str_id_lock);
138			return ENOENT;
139		}
140		entry->nsi_flags |= (1 << kind);
141		if (entry->nsi_id >= nsi_kind_next[kind])
142			nsi_kind_next[kind] = entry->nsi_id + 1;
143	}
144	lck_mtx_unlock(net_str_id_lock);
145
146	*out_id = entry->nsi_id;
147
148	return 0;
149}
150
151
152#define ROUNDUP32(a) \
153        ((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t))
154
155int
156sysctl_if_family_ids SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
157{
158#pragma unused(oidp)
159#pragma unused(arg1)
160#pragma unused(arg2)
161	errno_t	error = 0;
162	struct net_str_id_entry *entry = NULL;
163	struct if_family_id *iffmid = NULL;
164	size_t max_size = 0;
165
166	lck_mtx_lock(net_str_id_lock);
167	SLIST_FOREACH(entry, &net_str_id_list, nsi_next) {
168		size_t str_size;
169		size_t iffmid_size;
170
171		if ((entry->nsi_flags & (1 << NSI_IF_FAM_ID)) == 0)
172			continue;
173
174		str_size = strlen(entry->nsi_string) + 1;
175		iffmid_size = ROUNDUP32(offsetof(struct net_str_id_entry, nsi_string) + str_size);
176
177		if (iffmid_size > max_size) {
178			if (iffmid)
179				_FREE(iffmid, M_TEMP);
180			iffmid = _MALLOC(iffmid_size, M_TEMP, M_WAITOK);
181			if (iffmid == NULL) {
182				lck_mtx_unlock(net_str_id_lock);
183				error = ENOMEM;
184				goto done;
185			}
186			max_size = iffmid_size;
187		}
188
189		bzero(iffmid, iffmid_size);
190		iffmid->iffmid_len = iffmid_size;
191		iffmid->iffmid_id = entry->nsi_id;
192		strlcpy(iffmid->iffmid_str, entry->nsi_string, str_size);
193        error = SYSCTL_OUT(req, iffmid, iffmid_size);
194        if (error) {
195			lck_mtx_unlock(net_str_id_lock);
196			goto done;
197        }
198
199	}
200	lck_mtx_unlock(net_str_id_lock);
201
202done:
203	if (iffmid)
204		_FREE(iffmid, M_TEMP);
205	return error;
206}
207