1/*
2 * Copyright 2013 Google Inc.
3 * Author: Willem de Bruijn <willemb@google.com>
4 *         Daniel Borkmann <dborkman@redhat.com>
5 *
6 * License (GPLv2):
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
22#ifndef PSOCK_LIB_H
23#define PSOCK_LIB_H
24
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <string.h>
28#include <arpa/inet.h>
29#include <unistd.h>
30
31#define DATA_LEN			100
32#define DATA_CHAR			'a'
33
34#define PORT_BASE			8000
35
36#ifndef __maybe_unused
37# define __maybe_unused		__attribute__ ((__unused__))
38#endif
39
40static __maybe_unused void pair_udp_setfilter(int fd)
41{
42	struct sock_filter bpf_filter[] = {
43		{ 0x80, 0, 0, 0x00000000 },  /* LD  pktlen		      */
44		{ 0x35, 0, 5, DATA_LEN   },  /* JGE DATA_LEN  [f goto nomatch]*/
45		{ 0x30, 0, 0, 0x00000050 },  /* LD  ip[80]		      */
46		{ 0x15, 0, 3, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
47		{ 0x30, 0, 0, 0x00000051 },  /* LD  ip[81]		      */
48		{ 0x15, 0, 1, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
49		{ 0x06, 0, 0, 0x00000060 },  /* RET match	              */
50		{ 0x06, 0, 0, 0x00000000 },  /* RET no match		      */
51	};
52	struct sock_fprog bpf_prog;
53
54	bpf_prog.filter = bpf_filter;
55	bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
56	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
57		       sizeof(bpf_prog))) {
58		perror("setsockopt SO_ATTACH_FILTER");
59		exit(1);
60	}
61}
62
63static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
64{
65	struct sockaddr_in saddr, daddr;
66
67	fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
68	fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
69	if (fds[0] == -1 || fds[1] == -1) {
70		fprintf(stderr, "ERROR: socket dgram\n");
71		exit(1);
72	}
73
74	memset(&saddr, 0, sizeof(saddr));
75	saddr.sin_family = AF_INET;
76	saddr.sin_port = htons(port);
77	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
78
79	memset(&daddr, 0, sizeof(daddr));
80	daddr.sin_family = AF_INET;
81	daddr.sin_port = htons(port + 1);
82	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
83
84	/* must bind both to get consistent hash result */
85	if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
86		perror("bind");
87		exit(1);
88	}
89	if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
90		perror("bind");
91		exit(1);
92	}
93	if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
94		perror("connect");
95		exit(1);
96	}
97}
98
99static __maybe_unused void pair_udp_send(int fds[], int num)
100{
101	char buf[DATA_LEN], rbuf[DATA_LEN];
102
103	memset(buf, DATA_CHAR, sizeof(buf));
104	while (num--) {
105		/* Should really handle EINTR and EAGAIN */
106		if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
107			fprintf(stderr, "ERROR: send failed left=%d\n", num);
108			exit(1);
109		}
110		if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
111			fprintf(stderr, "ERROR: recv failed left=%d\n", num);
112			exit(1);
113		}
114		if (memcmp(buf, rbuf, sizeof(buf))) {
115			fprintf(stderr, "ERROR: data failed left=%d\n", num);
116			exit(1);
117		}
118	}
119}
120
121static __maybe_unused void pair_udp_close(int fds[])
122{
123	close(fds[0]);
124	close(fds[1]);
125}
126
127#endif /* PSOCK_LIB_H */
128