1 /*
2 * Copyright (c) 2024 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 "kpi_interface.h"
30 #include <stddef.h>
31
32 #include <net/dlil.h>
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/mbuf.h>
39 #include <sys/socket.h>
40 #include <sys/domain.h>
41 #include <sys/user.h>
42
43 #include <kern/assert.h>
44 #include <kern/task.h>
45 #include <kern/thread.h>
46 #include <kern/sched_prim.h>
47 #include <kern/locks.h>
48 #include <kern/zalloc.h>
49
50 struct net_thread_marks { };
51 static const struct net_thread_marks net_thread_marks_base = { };
52
53 __private_extern__ const net_thread_marks_t net_thread_marks_none =
54 &net_thread_marks_base;
55
56 __private_extern__ net_thread_marks_t
net_thread_marks_push(u_int32_t push)57 net_thread_marks_push(u_int32_t push)
58 {
59 static const char *__unsafe_indexable const base = (const void*__single)&net_thread_marks_base;
60 u_int32_t pop = 0;
61
62 if (push != 0) {
63 struct uthread *uth = current_uthread();
64
65 pop = push & ~uth->uu_network_marks;
66 if (pop != 0) {
67 uth->uu_network_marks |= pop;
68 }
69 }
70
71 return __unsafe_forge_single(net_thread_marks_t, (base + pop));
72 }
73
74 __private_extern__ net_thread_marks_t
net_thread_unmarks_push(u_int32_t unpush)75 net_thread_unmarks_push(u_int32_t unpush)
76 {
77 static const char *__unsafe_indexable const base = (const void*__single)&net_thread_marks_base;
78 u_int32_t unpop = 0;
79
80 if (unpush != 0) {
81 struct uthread *uth = current_uthread();
82
83 unpop = unpush & uth->uu_network_marks;
84 if (unpop != 0) {
85 uth->uu_network_marks &= ~unpop;
86 }
87 }
88
89 return __unsafe_forge_single(net_thread_marks_t, (base + unpop));
90 }
91
92 __private_extern__ void
net_thread_marks_pop(net_thread_marks_t popx)93 net_thread_marks_pop(net_thread_marks_t popx)
94 {
95 static const char *__unsafe_indexable const base = (const void*__single)&net_thread_marks_base;
96 const ptrdiff_t pop = (const char *)popx - (const char *)base;
97 if (pop != 0) {
98 static const ptrdiff_t ones = (ptrdiff_t)(u_int32_t)~0U;
99 struct uthread *uth = current_uthread();
100
101 VERIFY((pop & ones) == pop);
102 VERIFY((ptrdiff_t)(uth->uu_network_marks & pop) == pop);
103 uth->uu_network_marks &= ~pop;
104 }
105 }
106
107 __private_extern__ void
net_thread_unmarks_pop(net_thread_marks_t unpopx)108 net_thread_unmarks_pop(net_thread_marks_t unpopx)
109 {
110 static const char *__unsafe_indexable const base = (const void*__single)&net_thread_marks_base;
111 ptrdiff_t unpop = (const char *)unpopx - (const char *)base;
112
113 if (unpop != 0) {
114 static const ptrdiff_t ones = (ptrdiff_t)(u_int32_t)~0U;
115 struct uthread *uth = current_uthread();
116
117 VERIFY((unpop & ones) == unpop);
118 VERIFY((ptrdiff_t)(uth->uu_network_marks & unpop) == 0);
119 uth->uu_network_marks |= (u_int32_t)unpop;
120 }
121 }
122
123
124 __private_extern__ u_int32_t
net_thread_is_marked(u_int32_t check)125 net_thread_is_marked(u_int32_t check)
126 {
127 if (check != 0) {
128 struct uthread *uth = current_uthread();
129 return uth->uu_network_marks & check;
130 } else {
131 return 0;
132 }
133 }
134
135 __private_extern__ u_int32_t
net_thread_is_unmarked(u_int32_t check)136 net_thread_is_unmarked(u_int32_t check)
137 {
138 if (check != 0) {
139 struct uthread *uth = current_uthread();
140 return ~uth->uu_network_marks & check;
141 } else {
142 return 0;
143 }
144 }
145