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Based on 1 normalized pattern(s): license gplv2 this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171440.038486796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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