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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_H9#define PSOCK_LIB_H10 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 10020#define DATA_CHAR 'a'21#define DATA_CHAR_1 'b'22 23#define PORT_BASE 800024 25#ifndef __maybe_unused26# define __maybe_unused __attribute__ ((__unused__))27#endif28 29static __maybe_unused void pair_udp_setfilter(int fd)30{31 /* the filter below checks for all of the following conditions that32 * are based on the contents of create_payload()33 * ether type 0x800 and34 * ip proto udp and35 * skb->len == DATA_LEN and36 * 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_IP40 * ldb [23]41 * jneq #17, drop ; IPPROTO_UDP42 * ld len ; ld skb->len43 * jlt #100, drop ; DATA_LEN44 * ldb [80]45 * jeq #97, pass ; DATA_CHAR46 * jne #98, drop ; DATA_CHAR_147 * pass:48 * ret #-149 * drop:50 * ret #051 */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 77static __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 113static __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 135static __maybe_unused void pair_udp_send(int fds[], int num)136{137 return pair_udp_send_char(fds, num, DATA_CHAR);138}139 140static __maybe_unused void pair_udp_close(int fds[])141{142 close(fds[0]);143 close(fds[1]);144}145 146#endif /* PSOCK_LIB_H */147