1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright 2013 Google Inc.
4 * Author: Willem de Bruijn <willemb@google.com>
5 *         Daniel Borkmann <dborkman@redhat.com>
6 */
7
8#ifndef PSOCK_LIB_H
9#define PSOCK_LIB_H
10
11#include <sys/types.h>
12#include <sys/socket.h>
13#include <string.h>
14#include <arpa/inet.h>
15#include <unistd.h>
16
17#include "kselftest.h"
18
19#define DATA_LEN			100
20#define DATA_CHAR			'a'
21#define DATA_CHAR_1			'b'
22
23#define PORT_BASE			8000
24
25#ifndef __maybe_unused
26# define __maybe_unused		__attribute__ ((__unused__))
27#endif
28
29static __maybe_unused void pair_udp_setfilter(int fd)
30{
31	/* the filter below checks for all of the following conditions that
32	 * are based on the contents of create_payload()
33	 *  ether type 0x800 and
34	 *  ip proto udp     and
35	 *  skb->len == DATA_LEN and
36	 *  udp[38] == 'a' or udp[38] == 'b'
37	 * It can be generated from the following bpf_asm input:
38	 *	ldh [12]
39	 *	jne #0x800, drop	; ETH_P_IP
40	 *	ldb [23]
41	 *	jneq #17, drop		; IPPROTO_UDP
42	 *	ld len			; ld skb->len
43	 *	jlt #100, drop		; DATA_LEN
44	 *	ldb [80]
45	 *	jeq #97, pass		; DATA_CHAR
46	 *	jne #98, drop		; DATA_CHAR_1
47	 *	pass:
48	 *	  ret #-1
49	 *	drop:
50	 *	  ret #0
51	 */
52	struct sock_filter bpf_filter[] = {
53		{ 0x28,  0,  0, 0x0000000c },
54		{ 0x15,  0,  8, 0x00000800 },
55		{ 0x30,  0,  0, 0x00000017 },
56		{ 0x15,  0,  6, 0x00000011 },
57		{ 0x80,  0,  0, 0000000000 },
58		{ 0x35,  0,  4, 0x00000064 },
59		{ 0x30,  0,  0, 0x00000050 },
60		{ 0x15,  1,  0, 0x00000061 },
61		{ 0x15,  0,  1, 0x00000062 },
62		{ 0x06,  0,  0, 0xffffffff },
63		{ 0x06,  0,  0, 0000000000 },
64	};
65	struct sock_fprog bpf_prog;
66
67	bpf_prog.filter = bpf_filter;
68	bpf_prog.len = ARRAY_SIZE(bpf_filter);
69
70	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
71		       sizeof(bpf_prog))) {
72		perror("setsockopt SO_ATTACH_FILTER");
73		exit(1);
74	}
75}
76
77static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
78{
79	struct sockaddr_in saddr, daddr;
80
81	fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
82	fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
83	if (fds[0] == -1 || fds[1] == -1) {
84		fprintf(stderr, "ERROR: socket dgram\n");
85		exit(1);
86	}
87
88	memset(&saddr, 0, sizeof(saddr));
89	saddr.sin_family = AF_INET;
90	saddr.sin_port = htons(port);
91	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
92
93	memset(&daddr, 0, sizeof(daddr));
94	daddr.sin_family = AF_INET;
95	daddr.sin_port = htons(port + 1);
96	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
97
98	/* must bind both to get consistent hash result */
99	if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
100		perror("bind");
101		exit(1);
102	}
103	if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
104		perror("bind");
105		exit(1);
106	}
107	if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
108		perror("connect");
109		exit(1);
110	}
111}
112
113static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
114{
115	char buf[DATA_LEN], rbuf[DATA_LEN];
116
117	memset(buf, payload, sizeof(buf));
118	while (num--) {
119		/* Should really handle EINTR and EAGAIN */
120		if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
121			fprintf(stderr, "ERROR: send failed left=%d\n", num);
122			exit(1);
123		}
124		if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
125			fprintf(stderr, "ERROR: recv failed left=%d\n", num);
126			exit(1);
127		}
128		if (memcmp(buf, rbuf, sizeof(buf))) {
129			fprintf(stderr, "ERROR: data failed left=%d\n", num);
130			exit(1);
131		}
132	}
133}
134
135static __maybe_unused void pair_udp_send(int fds[], int num)
136{
137	return pair_udp_send_char(fds, num, DATA_CHAR);
138}
139
140static __maybe_unused void pair_udp_close(int fds[])
141{
142	close(fds[0]);
143	close(fds[1]);
144}
145
146#endif /* PSOCK_LIB_H */
147