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
pair_udp_setfilter(int fd)40 static __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
pair_udp_open(int fds[],uint16_t port)63 static __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
pair_udp_send(int fds[],int num)99 static __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
pair_udp_close(int fds[])121 static __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