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 |
49 | static SLIST_HEAD(,net_str_id_entry) net_str_id_list = {NULL}; |
50 | decl_lck_mtx_data(static, net_str_id_lock_data); |
51 | static lck_mtx_t *net_str_id_lock = &net_str_id_lock_data; |
52 | |
53 | static u_int32_t nsi_kind_next[NSI_MAX_KIND] = { FIRST_NET_STR_ID, FIRST_NET_STR_ID, FIRST_NET_STR_ID }; |
54 | static u_int32_t nsi_next_id = FIRST_NET_STR_ID; |
55 | |
56 | extern int sysctl_if_family_ids SYSCTL_HANDLER_ARGS; |
57 | |
58 | SYSCTL_DECL(_net_link_generic_system); |
59 | |
60 | SYSCTL_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 |
64 | net_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 |
82 | net_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 |
99 | net_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 | |
155 | int |
156 | sysctl_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 | |
202 | done: |
203 | if (iffmid) |
204 | _FREE(iffmid, M_TEMP); |
205 | return error; |
206 | } |
207 | |