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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
// SPDX-License-Identifier: GPL-2.0-only
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <linux/err.h>
#include <linux/in.h>
#include <linux/in6.h>
#include "bpf_util.h"
#include "network_helpers.h"
#define clean_errno() (errno == 0 ? "None" : strerror(errno))
#define log_err(MSG, ...) ({ \
int __save = errno; \
fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
__FILE__, __LINE__, clean_errno(), \
##__VA_ARGS__); \
errno = __save; \
})
struct ipv4_packet pkt_v4 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
.iph.ihl = 5,
.iph.protocol = IPPROTO_TCP,
.iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
struct ipv6_packet pkt_v6 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
.iph.nexthdr = IPPROTO_TCP,
.iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
int settimeo(int fd, int timeout_ms)
{
struct timeval timeout = { .tv_sec = 3 };
if (timeout_ms > 0) {
timeout.tv_sec = timeout_ms / 1000;
timeout.tv_usec = (timeout_ms % 1000) * 1000;
}
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout,
sizeof(timeout))) {
log_err("Failed to set SO_RCVTIMEO");
return -1;
}
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout,
sizeof(timeout))) {
log_err("Failed to set SO_SNDTIMEO");
return -1;
}
return 0;
}
#define save_errno_close(fd) ({ int __save = errno; close(fd); errno = __save; })
int start_server(int family, int type, const char *addr_str, __u16 port,
int timeout_ms)
{
struct sockaddr_storage addr = {};
socklen_t len;
int fd;
if (make_sockaddr(family, addr_str, port, &addr, &len))
return -1;
fd = socket(family, type, 0);
if (fd < 0) {
log_err("Failed to create server socket");
return -1;
}
if (settimeo(fd, timeout_ms))
goto error_close;
if (bind(fd, (const struct sockaddr *)&addr, len) < 0) {
log_err("Failed to bind socket");
goto error_close;
}
if (type == SOCK_STREAM) {
if (listen(fd, 1) < 0) {
log_err("Failed to listed on socket");
goto error_close;
}
}
return fd;
error_close:
save_errno_close(fd);
return -1;
}
int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
int timeout_ms)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
struct sockaddr_in *addr_in;
int fd, ret;
if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
log_err("Failed to get server addr");
return -1;
}
addr_in = (struct sockaddr_in *)&addr;
fd = socket(addr_in->sin_family, SOCK_STREAM, 0);
if (fd < 0) {
log_err("Failed to create client socket");
return -1;
}
if (settimeo(fd, timeout_ms))
goto error_close;
ret = sendto(fd, data, data_len, MSG_FASTOPEN, (struct sockaddr *)&addr,
addrlen);
if (ret != data_len) {
log_err("sendto(data, %u) != %d\n", data_len, ret);
goto error_close;
}
return fd;
error_close:
save_errno_close(fd);
return -1;
}
static int connect_fd_to_addr(int fd,
const struct sockaddr_storage *addr,
socklen_t addrlen)
{
if (connect(fd, (const struct sockaddr *)addr, addrlen)) {
log_err("Failed to connect to server");
return -1;
}
return 0;
}
int connect_to_fd(int server_fd, int timeout_ms)
{
struct sockaddr_storage addr;
struct sockaddr_in *addr_in;
socklen_t addrlen, optlen;
int fd, type;
optlen = sizeof(type);
if (getsockopt(server_fd, SOL_SOCKET, SO_TYPE, &type, &optlen)) {
log_err("getsockopt(SOL_TYPE)");
return -1;
}
addrlen = sizeof(addr);
if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
log_err("Failed to get server addr");
return -1;
}
addr_in = (struct sockaddr_in *)&addr;
fd = socket(addr_in->sin_family, type, 0);
if (fd < 0) {
log_err("Failed to create client socket");
return -1;
}
if (settimeo(fd, timeout_ms))
goto error_close;
if (connect_fd_to_addr(fd, &addr, addrlen))
goto error_close;
return fd;
error_close:
save_errno_close(fd);
return -1;
}
int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
if (settimeo(client_fd, timeout_ms))
return -1;
if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
log_err("Failed to get server addr");
return -1;
}
if (connect_fd_to_addr(client_fd, &addr, len))
return -1;
return 0;
}
int make_sockaddr(int family, const char *addr_str, __u16 port,
struct sockaddr_storage *addr, socklen_t *len)
{
if (family == AF_INET) {
struct sockaddr_in *sin = (void *)addr;
sin->sin_family = AF_INET;
sin->sin_port = htons(port);
if (addr_str &&
inet_pton(AF_INET, addr_str, &sin->sin_addr) != 1) {
log_err("inet_pton(AF_INET, %s)", addr_str);
return -1;
}
if (len)
*len = sizeof(*sin);
return 0;
} else if (family == AF_INET6) {
struct sockaddr_in6 *sin6 = (void *)addr;
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
if (addr_str &&
inet_pton(AF_INET6, addr_str, &sin6->sin6_addr) != 1) {
log_err("inet_pton(AF_INET6, %s)", addr_str);
return -1;
}
if (len)
*len = sizeof(*sin6);
return 0;
}
return -1;
}
|
