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 #define DATA_CHAR_1                     'b'
  34
  35 #define PORT_BASE                       8000
  36
  37 #ifndef __maybe_unused
  38 # define __maybe_unused         __attribute__ ((__unused__))
  39 #endif
  40
  41 static __maybe_unused void sock_setfilter(int fd, int lvl, int optnum)
  42 {
  43         struct sock_filter bpf_filter[] = {
  44                 { 0x80, 0, 0, 0x00000000 },  /* LD  pktlen                    */
  45                 { 0x35, 0, 4, DATA_LEN   },  /* JGE DATA_LEN  [f goto nomatch]*/
  46                 { 0x30, 0, 0, 0x00000050 },  /* LD  ip[80]                    */
  47                 { 0x15, 1, 0, DATA_CHAR  },  /* JEQ DATA_CHAR   [t goto match]*/
  48                 { 0x15, 0, 1, DATA_CHAR_1},  /* JEQ DATA_CHAR_1 [t goto match]*/
  49                 { 0x06, 0, 0, 0x00000060 },  /* RET match                     */
  50                 { 0x06, 0, 0, 0x00000000 },  /* RET no match                  */
  51         };
  52         struct sock_fprog bpf_prog;
  53
  54         if (lvl == SOL_PACKET && optnum == PACKET_FANOUT_DATA)
  55                 bpf_filter[5].code = 0x16;   /* RET A                         */
  56
  57         bpf_prog.filter = bpf_filter;
  58         bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
  59         if (setsockopt(fd, lvl, optnum, &bpf_prog,
  60                        sizeof(bpf_prog))) {
  61                 perror("setsockopt SO_ATTACH_FILTER");
  62                 exit(1);
  63         }
  64 }
  65
  66 static __maybe_unused void pair_udp_setfilter(int fd)
  67 {
  68         sock_setfilter(fd, SOL_SOCKET, SO_ATTACH_FILTER);
  69 }
  70
  71 static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
  72 {
  73         struct sockaddr_in saddr, daddr;
  74
  75         fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
  76         fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
  77         if (fds[0] == -1 || fds[1] == -1) {
  78                 fprintf(stderr, "ERROR: socket dgram\n");
  79                 exit(1);
  80         }
  81
  82         memset(&saddr, 0, sizeof(saddr));
  83         saddr.sin_family = AF_INET;
  84         saddr.sin_port = htons(port);
  85         saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  86
  87         memset(&daddr, 0, sizeof(daddr));
  88         daddr.sin_family = AF_INET;
  89         daddr.sin_port = htons(port + 1);
  90         daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  91
  92         /* must bind both to get consistent hash result */
  93         if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
  94                 perror("bind");
  95                 exit(1);
  96         }
  97         if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
  98                 perror("bind");
  99                 exit(1);
 100         }
 101         if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
 102                 perror("connect");
 103                 exit(1);
 104         }
 105 }
 106
 107 static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
 108 {
 109         char buf[DATA_LEN], rbuf[DATA_LEN];
 110
 111         memset(buf, payload, sizeof(buf));
 112         while (num--) {
 113                 /* Should really handle EINTR and EAGAIN */
 114                 if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
 115                         fprintf(stderr, "ERROR: send failed left=%d\n", num);
 116                         exit(1);
 117                 }
 118                 if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
 119                         fprintf(stderr, "ERROR: recv failed left=%d\n", num);
 120                         exit(1);
 121                 }
 122                 if (memcmp(buf, rbuf, sizeof(buf))) {
 123                         fprintf(stderr, "ERROR: data failed left=%d\n", num);
 124                         exit(1);
 125                 }
 126         }
 127 }
 128
 129 static __maybe_unused void pair_udp_send(int fds[], int num)
 130 {
 131         return pair_udp_send_char(fds, num, DATA_CHAR);
 132 }
 133
 134 static __maybe_unused void pair_udp_close(int fds[])
 135 {
 136         close(fds[0]);
 137         close(fds[1]);
 138 }
 139
 140 #endif /* PSOCK_LIB_H */