2 * Copyright 2013 Google Inc.
3 * Author: Willem de Bruijn <willemb@google.com>
4 * Daniel Borkmann <dborkman@redhat.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <sys/types.h>
26 #include <sys/socket.h>
28 #include <arpa/inet.h>
33 #define DATA_CHAR_1 'b'
35 #define PORT_BASE 8000
37 #ifndef __maybe_unused
38 # define __maybe_unused __attribute__ ((__unused__))
41 static __maybe_unused void sock_setfilter(int fd, int lvl, int optnum)
43 struct sock_filter bpf_filter[] = {
44 { 0x80, 0, 0, 0x00000000 }, /* LD pktlen */
45 { 0x35, 0, 4, DATA_LEN }, /* JGE DATA_LEN [f goto nomatch]*/
46 { 0x30, 0, 0, 0x00000050 }, /* LD ip[80] */
47 { 0x15, 1, 0, DATA_CHAR }, /* JEQ DATA_CHAR [t goto match]*/
48 { 0x15, 0, 1, DATA_CHAR_1}, /* JEQ DATA_CHAR_1 [t goto match]*/
49 { 0x06, 0, 0, 0x00000060 }, /* RET match */
50 { 0x06, 0, 0, 0x00000000 }, /* RET no match */
52 struct sock_fprog bpf_prog;
54 if (lvl == SOL_PACKET && optnum == PACKET_FANOUT_DATA)
55 bpf_filter[5].code = 0x16; /* RET A */
57 bpf_prog.filter = bpf_filter;
58 bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
59 if (setsockopt(fd, lvl, optnum, &bpf_prog,
61 perror("setsockopt SO_ATTACH_FILTER");
66 static __maybe_unused void pair_udp_setfilter(int fd)
68 sock_setfilter(fd, SOL_SOCKET, SO_ATTACH_FILTER);
71 static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
73 struct sockaddr_in saddr, daddr;
75 fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
76 fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
77 if (fds[0] == -1 || fds[1] == -1) {
78 fprintf(stderr, "ERROR: socket dgram\n");
82 memset(&saddr, 0, sizeof(saddr));
83 saddr.sin_family = AF_INET;
84 saddr.sin_port = htons(port);
85 saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
87 memset(&daddr, 0, sizeof(daddr));
88 daddr.sin_family = AF_INET;
89 daddr.sin_port = htons(port + 1);
90 daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
92 /* must bind both to get consistent hash result */
93 if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
97 if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
101 if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
107 static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
109 char buf[DATA_LEN], rbuf[DATA_LEN];
111 memset(buf, payload, sizeof(buf));
113 /* Should really handle EINTR and EAGAIN */
114 if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
115 fprintf(stderr, "ERROR: send failed left=%d\n", num);
118 if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
119 fprintf(stderr, "ERROR: recv failed left=%d\n", num);
122 if (memcmp(buf, rbuf, sizeof(buf))) {
123 fprintf(stderr, "ERROR: data failed left=%d\n", num);
129 static __maybe_unused void pair_udp_send(int fds[], int num)
131 return pair_udp_send_char(fds, num, DATA_CHAR);
134 static __maybe_unused void pair_udp_close(int fds[])
140 #endif /* PSOCK_LIB_H */