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         /* the filter below checks for all of the following conditions that
  44          * are based on the contents of create_payload()
  45          *  ether type 0x800 and
  46          *  ip proto udp     and
  47          *  skb->len == DATA_LEN and
  48          *  udp[38] == 'a' or udp[38] == 'b'
  49          * It can be generated from the following bpf_asm input:
  50          *      ldh [12]
  51          *      jne #0x800, drop        ; ETH_P_IP
  52          *      ldb [23]
  53          *      jneq #17, drop          ; IPPROTO_UDP
  54          *      ld len                  ; ld skb->len
  55          *      jlt #100, drop          ; DATA_LEN
  56          *      ldb [80]
  57          *      jeq #97, pass           ; DATA_CHAR
  58          *      jne #98, drop           ; DATA_CHAR_1
  59          *      pass:
  60          *        ret #-1
  61          *      drop:
  62          *        ret #0
  63          */
  64         struct sock_filter bpf_filter[] = {
  65                 { 0x28,  0,  0, 0x0000000c },
  66                 { 0x15,  0,  8, 0x00000800 },
  67                 { 0x30,  0,  0, 0x00000017 },
  68                 { 0x15,  0,  6, 0x00000011 },
  69                 { 0x80,  0,  0, 0000000000 },
  70                 { 0x35,  0,  4, 0x00000064 },
  71                 { 0x30,  0,  0, 0x00000050 },
  72                 { 0x15,  1,  0, 0x00000061 },
  73                 { 0x15,  0,  1, 0x00000062 },
  74                 { 0x06,  0,  0, 0xffffffff },
  75                 { 0x06,  0,  0, 0000000000 },
  76         };
  77         struct sock_fprog bpf_prog;
  78
  79         if (lvl == SOL_PACKET && optnum == PACKET_FANOUT_DATA)
  80                 bpf_filter[5].code = 0x16;   /* RET A                         */
  81
  82         bpf_prog.filter = bpf_filter;
  83         bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
  84         if (setsockopt(fd, lvl, optnum, &bpf_prog,
  85                        sizeof(bpf_prog))) {
  86                 perror("setsockopt SO_ATTACH_FILTER");
  87                 exit(1);
  88         }
  89 }
  90
  91 static __maybe_unused void pair_udp_setfilter(int fd)
  92 {
  93         sock_setfilter(fd, SOL_SOCKET, SO_ATTACH_FILTER);
  94 }
  95
  96 static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
  97 {
  98         struct sockaddr_in saddr, daddr;
  99
 100         fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
 101         fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
 102         if (fds[0] == -1 || fds[1] == -1) {
 103                 fprintf(stderr, "ERROR: socket dgram\n");
 104                 exit(1);
 105         }
 106
 107         memset(&saddr, 0, sizeof(saddr));
 108         saddr.sin_family = AF_INET;
 109         saddr.sin_port = htons(port);
 110         saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 111
 112         memset(&daddr, 0, sizeof(daddr));
 113         daddr.sin_family = AF_INET;
 114         daddr.sin_port = htons(port + 1);
 115         daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 116
 117         /* must bind both to get consistent hash result */
 118         if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
 119                 perror("bind");
 120                 exit(1);
 121         }
 122         if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
 123                 perror("bind");
 124                 exit(1);
 125         }
 126         if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
 127                 perror("connect");
 128                 exit(1);
 129         }
 130 }
 131
 132 static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
 133 {
 134         char buf[DATA_LEN], rbuf[DATA_LEN];
 135
 136         memset(buf, payload, sizeof(buf));
 137         while (num--) {
 138                 /* Should really handle EINTR and EAGAIN */
 139                 if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
 140                         fprintf(stderr, "ERROR: send failed left=%d\n", num);
 141                         exit(1);
 142                 }
 143                 if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
 144                         fprintf(stderr, "ERROR: recv failed left=%d\n", num);
 145                         exit(1);
 146                 }
 147                 if (memcmp(buf, rbuf, sizeof(buf))) {
 148                         fprintf(stderr, "ERROR: data failed left=%d\n", num);
 149                         exit(1);
 150                 }
 151         }
 152 }
 153
 154 static __maybe_unused void pair_udp_send(int fds[], int num)
 155 {
 156         return pair_udp_send_char(fds, num, DATA_CHAR);
 157 }
 158
 159 static __maybe_unused void pair_udp_close(int fds[])
 160 {
 161         close(fds[0]);
 162         close(fds[1]);
 163 }
 164
 165 #endif /* PSOCK_LIB_H */