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142 lines · 3.4 KiB

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