tools/testing/selftests/net/psock_lib.h

   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
  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
  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
  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
 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 */