LXR linux/tools/testing/selftests/net/psock

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