1 /* Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
2 *
3 * Redistribution and use in source and binary forms, with or without modification,
4 * are permitted provided that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain the above copyright notice, this list of
7 * conditions and the following disclaimer.
8 *
9 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
10 * of conditions and the following disclaimer in the documentation and/or other materials
11 * provided with the distribution.
12 *
13 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
14 * to endorse or promote products derived from this software without specific prior written
15 * permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "lwip/opt.h"
31
32 #if LWIP_ENABLE_DISTRIBUTED_NET
33
34 #include "lwip/distributed_net/distributed_net_utils.h"
35
36 typedef struct no_proxy_network_segment {
37 const char *ip;
38 const in_addr_t mask_len;
39 } no_proxy_network_segment;
40
41 static const no_proxy_network_segment g_special_network_segment[] = {
42 {"127.0.0.0", 8},
43 {"192.0.0.0", 29},
44 {"192.0.2.0", 24},
45 {"192.168.0.0", 16},
46 {"192.18.0.0", 15},
47 {"192.51.100.0", 24},
48 {"0.0.0.0", 8},
49 {"100.64.0.0", 10},
50 {"169.254.0.0", 16},
51 {"172.16.0.0", 12},
52 {"203.0.113.0", 24},
53 {"224.0.0.0", 4},
54 {"240.0.0.0", 4},
55 {"10.0.0.0", 8},
56 {"255.255.255.255", 32},
57 };
58
mask_len_to_mask(u32_t mask_len)59 static in_addr_t mask_len_to_mask(u32_t mask_len)
60 {
61 if (mask_len > 32) {
62 return UINT_MAX;
63 }
64 u8_t num[4] = {0};
65 for (int i = 0; i < 4; ++i) {
66 u32_t len = (mask_len > 8 ? 8 : mask_len);
67 if (len > 0) {
68 u8_t byte = 0x80;// binary 1000|0000
69 u8_t bit = 0x80; // binary 1000|0000
70 for (u32_t j = 0; j < len - 1; ++j) {
71 byte = (bit >> 1U) | byte;
72 bit >>= 1U;
73 }
74 num[i] = byte;
75 }
76 if (mask_len < 8) {
77 break;
78 }
79 mask_len -= 8;
80 }
81 int mask = 0;
82 (void)memcpy_s(&mask, sizeof(int), num, sizeof(int));
83 return mask;
84 }
85
is_no_proxy_network_segment(const struct sockaddr_in * addr_in)86 u8_t is_no_proxy_network_segment(const struct sockaddr_in *addr_in)
87 {
88 for (int i = 0; i < sizeof(g_special_network_segment) / sizeof(g_special_network_segment[0]); ++i) {
89 ip4_addr_t ip4_ip = {addr_in->sin_addr.s_addr};
90 ip4_addr_t ip4_net_ip = {ipaddr_addr(g_special_network_segment[i].ip)};
91 ip4_addr_t ip4_mask = {mask_len_to_mask(g_special_network_segment[i].mask_len)};
92
93 if (ip4_addr_netcmp(&ip4_ip, &ip4_net_ip, &ip4_mask)) {
94 return 1;
95 }
96 }
97 return 0;
98 }
99
100 #endif /* LWIP_ENABLE_DISTRIBUTED_NET */