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 #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
25 #ifndef __maybe_unused
26 # define __maybe_unused __attribute__ ((__unused__))
27 #endif
28
29 static __maybe_unused void pair_udp_setfilter(int fd)
30 {
31 /* the filter below checks for all of the following conditions that
32 * are based on the contents of create_payload()
33 * ether type 0x800 and
34 * ip proto udp and
35 * skb->len == DATA_LEN and
36 * 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_IP
40 * ldb [23]
41 * jneq #17, drop ; IPPROTO_UDP
42 * ld len ; ld skb->len
43 * jlt #100, drop ; DATA_LEN
44 * ldb [80]
45 * jeq #97, pass ; DATA_CHAR
46 * jne #98, drop ; DATA_CHAR_1
47 * pass:
48 * ret #-1
49 * drop:
50 * ret #0
51 */
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
77 static __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
113 static __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
135 static __maybe_unused void pair_udp_send(int fds[], int num)
136 {
137 return pair_udp_send_char(fds, num, DATA_CHAR);
138 }
139
140 static __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
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