tools/testing/selftests/net/psock_lib.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2013 Google Inc.
   4  * Author: Willem de Bruijn <willemb@google.com>
   5  *         Daniel Borkmann <dborkman@redhat.com>
   6  */
   7
   8 #ifndef PSOCK_LIB_H
   9 #define PSOCK_LIB_H
  10
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13 #include <string.h>
  14 #include <arpa/inet.h>
  15 #include <unistd.h>
  16
  17 #include "kselftest.h"
  18
  19 #define DATA_LEN                        100
  20 #define DATA_CHAR                       'a'
  21 #define DATA_CHAR_1                     'b'
  22
  23 #define PORT_BASE                       8000
  24
  25 #ifndef __maybe_unused
  26 # define __maybe_unused         __attribute__ ((__unused__))
  27 #endif
  28
  29 static __maybe_unused void pair_udp_setfilter(int fd)
  30 {
  31         /* the filter below checks for all of the following conditions that
  32          * are based on the contents of create_payload()
  33          *  ether type 0x800 and
  34          *  ip proto udp     and
  35          *  skb->len == DATA_LEN and
  36          *  udp[38] == 'a' or udp[38] == 'b'
  37          * It can be generated from the following bpf_asm input:
  38          *      ldh [12]
  39          *      jne #0x800, drop        ; ETH_P_IP
  40          *      ldb [23]
  41          *      jneq #17, drop          ; IPPROTO_UDP
  42          *      ld len                  ; ld skb->len
  43          *      jlt #100, drop          ; DATA_LEN
  44          *      ldb [80]
  45          *      jeq #97, pass           ; DATA_CHAR
  46          *      jne #98, drop           ; DATA_CHAR_1
  47          *      pass:
  48          *        ret #-1
  49          *      drop:
  50          *        ret #0
  51          */
  52         struct sock_filter bpf_filter[] = {
  53                 { 0x28,  0,  0, 0x0000000c },
  54                 { 0x15,  0,  8, 0x00000800 },
  55                 { 0x30,  0,  0, 0x00000017 },
  56                 { 0x15,  0,  6, 0x00000011 },
  57                 { 0x80,  0,  0, 0000000000 },
  58                 { 0x35,  0,  4, 0x00000064 },
  59                 { 0x30,  0,  0, 0x00000050 },
  60                 { 0x15,  1,  0, 0x00000061 },
  61                 { 0x15,  0,  1, 0x00000062 },
  62                 { 0x06,  0,  0, 0xffffffff },
  63                 { 0x06,  0,  0, 0000000000 },
  64         };
  65         struct sock_fprog bpf_prog;
  66
  67         bpf_prog.filter = bpf_filter;
  68         bpf_prog.len = ARRAY_SIZE(bpf_filter);
  69
  70         if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
  71                        sizeof(bpf_prog))) {
  72                 perror("setsockopt SO_ATTACH_FILTER");
  73                 exit(1);
  74         }
  75 }
  76
  77 static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
  78 {
  79         struct sockaddr_in saddr, daddr;
  80
  81         fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
  82         fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
  83         if (fds[0] == -1 || fds[1] == -1) {
  84                 fprintf(stderr, "ERROR: socket dgram\n");
  85                 exit(1);
  86         }
  87
  88         memset(&saddr, 0, sizeof(saddr));
  89         saddr.sin_family = AF_INET;
  90         saddr.sin_port = htons(port);
  91         saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  92
  93         memset(&daddr, 0, sizeof(daddr));
  94         daddr.sin_family = AF_INET;
  95         daddr.sin_port = htons(port + 1);
  96         daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  97
  98         /* must bind both to get consistent hash result */
  99         if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
 100                 perror("bind");
 101                 exit(1);
 102         }
 103         if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
 104                 perror("bind");
 105                 exit(1);
 106         }
 107         if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
 108                 perror("connect");
 109                 exit(1);
 110         }
 111 }
 112
 113 static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
 114 {
 115         char buf[DATA_LEN], rbuf[DATA_LEN];
 116
 117         memset(buf, payload, sizeof(buf));
 118         while (num--) {
 119                 /* Should really handle EINTR and EAGAIN */
 120                 if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
 121                         fprintf(stderr, "ERROR: send failed left=%d\n", num);
 122                         exit(1);
 123                 }
 124                 if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
 125                         fprintf(stderr, "ERROR: recv failed left=%d\n", num);
 126                         exit(1);
 127                 }
 128                 if (memcmp(buf, rbuf, sizeof(buf))) {
 129                         fprintf(stderr, "ERROR: data failed left=%d\n", num);
 130                         exit(1);
 131                 }
 132         }
 133 }
 134
 135 static __maybe_unused void pair_udp_send(int fds[], int num)
 136 {
 137         return pair_udp_send_char(fds, num, DATA_CHAR);
 138 }
 139
 140 static __maybe_unused void pair_udp_close(int fds[])
 141 {
 142         close(fds[0]);
 143         close(fds[1]);
 144 }
 145
 146 #endif /* PSOCK_LIB_H */