145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2013 Google Inc.
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* Author: Willem de Bruijn <willemb@google.com>
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* Daniel Borkmann <dborkman@redhat.com>
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*/
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#ifndef PSOCK_LIB_H
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#define PSOCK_LIB_H
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#define DATA_LEN 100
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#define DATA_CHAR 'a'
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#define DATA_CHAR_1 'b'
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#define PORT_BASE 8000
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#ifndef __maybe_unused
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# define __maybe_unused __attribute__ ((__unused__))
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#endif
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static __maybe_unused void pair_udp_setfilter(int fd)
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{
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/* the filter below checks for all of the following conditions that
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* are based on the contents of create_payload()
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* ether type 0x800 and
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* ip proto udp and
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* skb->len == DATA_LEN and
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* udp[38] == 'a' or udp[38] == 'b'
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* It can be generated from the following bpf_asm input:
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* ldh [12]
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* jne #0x800, drop ; ETH_P_IP
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* ldb [23]
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* jneq #17, drop ; IPPROTO_UDP
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* ld len ; ld skb->len
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* jlt #100, drop ; DATA_LEN
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* ldb [80]
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* jeq #97, pass ; DATA_CHAR
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* jne #98, drop ; DATA_CHAR_1
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* pass:
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* ret #-1
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* drop:
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* ret #0
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*/
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struct sock_filter bpf_filter[] = {
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{ 0x28, 0, 0, 0x0000000c },
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{ 0x15, 0, 8, 0x00000800 },
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{ 0x30, 0, 0, 0x00000017 },
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{ 0x15, 0, 6, 0x00000011 },
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{ 0x80, 0, 0, 0000000000 },
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{ 0x35, 0, 4, 0x00000064 },
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{ 0x30, 0, 0, 0x00000050 },
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{ 0x15, 1, 0, 0x00000061 },
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{ 0x15, 0, 1, 0x00000062 },
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{ 0x06, 0, 0, 0xffffffff },
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{ 0x06, 0, 0, 0000000000 },
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};
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struct sock_fprog bpf_prog;
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bpf_prog.filter = bpf_filter;
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bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
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if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
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sizeof(bpf_prog))) {
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perror("setsockopt SO_ATTACH_FILTER");
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exit(1);
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}
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}
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static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
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{
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struct sockaddr_in saddr, daddr;
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fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
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fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
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if (fds[0] == -1 || fds[1] == -1) {
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fprintf(stderr, "ERROR: socket dgram\n");
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exit(1);
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}
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memset(&saddr, 0, sizeof(saddr));
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saddr.sin_family = AF_INET;
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saddr.sin_port = htons(port);
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saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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memset(&daddr, 0, sizeof(daddr));
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daddr.sin_family = AF_INET;
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daddr.sin_port = htons(port + 1);
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daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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/* must bind both to get consistent hash result */
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if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
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perror("bind");
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exit(1);
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}
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if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
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perror("bind");
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exit(1);
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}
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if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
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perror("connect");
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exit(1);
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}
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}
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static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
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{
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char buf[DATA_LEN], rbuf[DATA_LEN];
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memset(buf, payload, sizeof(buf));
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while (num--) {
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/* Should really handle EINTR and EAGAIN */
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if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
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fprintf(stderr, "ERROR: send failed left=%d\n", num);
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exit(1);
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}
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if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
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fprintf(stderr, "ERROR: recv failed left=%d\n", num);
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exit(1);
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}
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if (memcmp(buf, rbuf, sizeof(buf))) {
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fprintf(stderr, "ERROR: data failed left=%d\n", num);
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exit(1);
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}
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}
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}
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static __maybe_unused void pair_udp_send(int fds[], int num)
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{
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return pair_udp_send_char(fds, num, DATA_CHAR);
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}
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static __maybe_unused void pair_udp_close(int fds[])
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{
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close(fds[0]);
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close(fds[1]);
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}
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#endif /* PSOCK_LIB_H */
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