fb11e647
 vrobic
reseau statique a...
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Copyright (C) 2016 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include "msg.h"
#include "net/gnrc/ipv6.h"
#include "net/gnrc/netif/hdr.h"
#include "net/gnrc/netreg.h"
#include "net/gnrc/udp.h"
#include "net/sock.h"
#include "sched.h"
#include "stack.h"
#define _MSG_QUEUE_SIZE (4)
static msg_t _msg_queue[_MSG_QUEUE_SIZE];
static gnrc_netreg_entry_t _udp_handler;
void _net_init(void)
{
msg_init_queue(_msg_queue, _MSG_QUEUE_SIZE);
gnrc_netreg_entry_init_pid(&_udp_handler, GNRC_NETREG_DEMUX_CTX_ALL,
sched_active_pid);
}
void _prepare_send_checks(void)
{
gnrc_netreg_register(GNRC_NETTYPE_UDP, &_udp_handler);
}
static gnrc_pktsnip_t *_build_udp_packet(const ipv6_addr_t *src,
const ipv6_addr_t *dst,
uint16_t src_port, uint16_t dst_port,
void *data, size_t data_len,
uint16_t netif)
{
gnrc_pktsnip_t *netif_hdr, *ipv6, *udp;
udp_hdr_t *udp_hdr;
ipv6_hdr_t *ipv6_hdr;
uint16_t csum = 0;
if ((netif > INT16_MAX) || ((sizeof(udp_hdr_t) + data_len) > UINT16_MAX)) {
return NULL;
}
udp = gnrc_pktbuf_add(NULL, NULL, sizeof(udp_hdr_t) + data_len,
GNRC_NETTYPE_UNDEF);
if (udp == NULL) {
return NULL;
}
udp_hdr = udp->data;
udp_hdr->src_port = byteorder_htons(src_port);
udp_hdr->dst_port = byteorder_htons(dst_port);
udp_hdr->length = byteorder_htons((uint16_t)udp->size);
udp_hdr->checksum.u16 = 0;
memcpy(udp_hdr + 1, data, data_len);
csum = inet_csum(csum, (uint8_t *)udp->data, udp->size);
ipv6 = gnrc_ipv6_hdr_build(NULL, src, dst);
if (ipv6 == NULL) {
return NULL;
}
ipv6_hdr = ipv6->data;
ipv6_hdr->len = byteorder_htons((uint16_t)udp->size);
ipv6_hdr->nh = PROTNUM_UDP;
ipv6_hdr->hl = 64;
csum = ipv6_hdr_inet_csum(csum, ipv6_hdr, PROTNUM_UDP, (uint16_t)udp->size);
if (csum == 0xffff) {
udp_hdr->checksum = byteorder_htons(csum);
}
else {
udp_hdr->checksum = byteorder_htons(~csum);
}
LL_APPEND(udp, ipv6);
netif_hdr = gnrc_netif_hdr_build(NULL, 0, NULL, 0);
if (netif_hdr == NULL) {
return NULL;
}
((gnrc_netif_hdr_t *)netif_hdr->data)->if_pid = (kernel_pid_t)netif;
LL_APPEND(udp, netif_hdr);
return udp;
}
bool _inject_packet(const ipv6_addr_t *src, const ipv6_addr_t *dst,
uint16_t src_port, uint16_t dst_port,
void *data, size_t data_len, uint16_t netif)
{
gnrc_pktsnip_t *pkt = _build_udp_packet(src, dst, src_port, dst_port,
data, data_len, netif);
if (pkt == NULL) {
return false;
}
return (gnrc_netapi_dispatch_receive(GNRC_NETTYPE_UDP,
GNRC_NETREG_DEMUX_CTX_ALL, pkt) > 0);
}
bool _check_net(void)
{
return (gnrc_pktbuf_is_sane() && gnrc_pktbuf_is_empty());
}
static inline bool _res(gnrc_pktsnip_t *pkt, bool res)
{
gnrc_pktbuf_release(pkt);
return res;
}
bool _check_packet(const ipv6_addr_t *src, const ipv6_addr_t *dst,
uint16_t src_port, uint16_t dst_port,
void *data, size_t data_len, uint16_t iface,
bool random_src_port)
{
gnrc_pktsnip_t *pkt, *ipv6, *udp;
ipv6_hdr_t *ipv6_hdr;
udp_hdr_t *udp_hdr;
msg_t msg;
msg_receive(&msg);
if (msg.type != GNRC_NETAPI_MSG_TYPE_SND) {
return false;
}
pkt = msg.content.ptr;
if (iface != SOCK_ADDR_ANY_NETIF) {
gnrc_netif_hdr_t *netif_hdr;
if (pkt->type != GNRC_NETTYPE_NETIF) {
return _res(pkt, false);
}
netif_hdr = pkt->data;
if (netif_hdr->if_pid != iface) {
return _res(pkt, false);
}
ipv6 = pkt->next;
}
else {
ipv6 = pkt;
}
if (ipv6->type != GNRC_NETTYPE_IPV6) {
return _res(pkt, false);
}
ipv6_hdr = ipv6->data;
udp = gnrc_pktsnip_search_type(ipv6, GNRC_NETTYPE_UDP);
if (udp == NULL) {
return _res(pkt, false);
}
udp_hdr = udp->data;
return _res(pkt, (memcmp(src, &ipv6_hdr->src, sizeof(ipv6_addr_t)) == 0) &&
(memcmp(dst, &ipv6_hdr->dst, sizeof(ipv6_addr_t)) == 0) &&
(ipv6_hdr->nh == PROTNUM_UDP) &&
(random_src_port || (src_port == byteorder_ntohs(udp_hdr->src_port))) &&
(dst_port == byteorder_ntohs(udp_hdr->dst_port)) &&
(udp->next != NULL) &&
(data_len == udp->next->size) &&
(memcmp(data, udp->next->data, data_len) == 0));
}
/** @} */
|