summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/net/psock_lib.h
blob: 6e4fef560873be09978b0da1f0a30bff13791c16 (plain)
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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright 2013 Google Inc.
 * Author: Willem de Bruijn <willemb@google.com>
 *         Daniel Borkmann <dborkman@redhat.com>
 */

#ifndef PSOCK_LIB_H
#define PSOCK_LIB_H

#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>

#include "kselftest.h"

#define DATA_LEN			100
#define DATA_CHAR			'a'
#define DATA_CHAR_1			'b'

#define PORT_BASE			8000

#ifndef __maybe_unused
# define __maybe_unused		__attribute__ ((__unused__))
#endif

static __maybe_unused void pair_udp_setfilter(int fd)
{
	/* the filter below checks for all of the following conditions that
	 * are based on the contents of create_payload()
	 *  ether type 0x800 and
	 *  ip proto udp     and
	 *  skb->len == DATA_LEN and
	 *  udp[38] == 'a' or udp[38] == 'b'
	 * It can be generated from the following bpf_asm input:
	 *	ldh [12]
	 *	jne #0x800, drop	; ETH_P_IP
	 *	ldb [23]
	 *	jneq #17, drop		; IPPROTO_UDP
	 *	ld len			; ld skb->len
	 *	jlt #100, drop		; DATA_LEN
	 *	ldb [80]
	 *	jeq #97, pass		; DATA_CHAR
	 *	jne #98, drop		; DATA_CHAR_1
	 *	pass:
	 *	  ret #-1
	 *	drop:
	 *	  ret #0
	 */
	struct sock_filter bpf_filter[] = {
		{ 0x28,  0,  0, 0x0000000c },
		{ 0x15,  0,  8, 0x00000800 },
		{ 0x30,  0,  0, 0x00000017 },
		{ 0x15,  0,  6, 0x00000011 },
		{ 0x80,  0,  0, 0000000000 },
		{ 0x35,  0,  4, 0x00000064 },
		{ 0x30,  0,  0, 0x00000050 },
		{ 0x15,  1,  0, 0x00000061 },
		{ 0x15,  0,  1, 0x00000062 },
		{ 0x06,  0,  0, 0xffffffff },
		{ 0x06,  0,  0, 0000000000 },
	};
	struct sock_fprog bpf_prog;

	bpf_prog.filter = bpf_filter;
	bpf_prog.len = ARRAY_SIZE(bpf_filter);

	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
		       sizeof(bpf_prog))) {
		perror("setsockopt SO_ATTACH_FILTER");
		exit(1);
	}
}

static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
{
	struct sockaddr_in saddr, daddr;

	fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
	fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
	if (fds[0] == -1 || fds[1] == -1) {
		fprintf(stderr, "ERROR: socket dgram\n");
		exit(1);
	}

	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_family = AF_INET;
	saddr.sin_port = htons(port);
	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

	memset(&daddr, 0, sizeof(daddr));
	daddr.sin_family = AF_INET;
	daddr.sin_port = htons(port + 1);
	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

	/* must bind both to get consistent hash result */
	if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
		perror("bind");
		exit(1);
	}
	if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
		perror("bind");
		exit(1);
	}
	if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
		perror("connect");
		exit(1);
	}
}

static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
{
	char buf[DATA_LEN], rbuf[DATA_LEN];

	memset(buf, payload, sizeof(buf));
	while (num--) {
		/* Should really handle EINTR and EAGAIN */
		if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
			fprintf(stderr, "ERROR: send failed left=%d\n", num);
			exit(1);
		}
		if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
			fprintf(stderr, "ERROR: recv failed left=%d\n", num);
			exit(1);
		}
		if (memcmp(buf, rbuf, sizeof(buf))) {
			fprintf(stderr, "ERROR: data failed left=%d\n", num);
			exit(1);
		}
	}
}

static __maybe_unused void pair_udp_send(int fds[], int num)
{
	return pair_udp_send_char(fds, num, DATA_CHAR);
}

static __maybe_unused void pair_udp_close(int fds[])
{
	close(fds[0]);
	close(fds[1]);
}

#endif /* PSOCK_LIB_H */