1 /* 2 * Copyright 2013 Google Inc. 3 * Author: Willem de Bruijn <willemb@google.com> 4 * Daniel Borkmann <dborkman@redhat.com> 5 * 6 * License (GPLv2): 7 * 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. 11 * 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 15 * more details. 16 * 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. 20 */ 21 22 #ifndef PSOCK_LIB_H 23 #define PSOCK_LIB_H 24 25 #include <sys/types.h> 26 #include <sys/socket.h> 27 #include <string.h> 28 #include <arpa/inet.h> 29 #include <unistd.h> 30 31 #define DATA_LEN 100 32 #define DATA_CHAR 'a' 33 #define DATA_CHAR_1 'b' 34 35 #define PORT_BASE 8000 36 37 #ifndef __maybe_unused 38 # define __maybe_unused __attribute__ ((__unused__)) 39 #endif 40 41 static __maybe_unused void sock_setfilter(int fd, int lvl, int optnum) 42 { 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 */ 51 }; 52 struct sock_fprog bpf_prog; 53 54 if (lvl == SOL_PACKET && optnum == PACKET_FANOUT_DATA) 55 bpf_filter[5].code = 0x16; /* RET A */ 56 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, 60 sizeof(bpf_prog))) { 61 perror("setsockopt SO_ATTACH_FILTER"); 62 exit(1); 63 } 64 } 65 66 static __maybe_unused void pair_udp_setfilter(int fd) 67 { 68 sock_setfilter(fd, SOL_SOCKET, SO_ATTACH_FILTER); 69 } 70 71 static __maybe_unused void pair_udp_open(int fds[], uint16_t port) 72 { 73 struct sockaddr_in saddr, daddr; 74 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"); 79 exit(1); 80 } 81 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); 86 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); 91 92 /* must bind both to get consistent hash result */ 93 if (bind(fds[1], (void *) &daddr, sizeof(daddr))) { 94 perror("bind"); 95 exit(1); 96 } 97 if (bind(fds[0], (void *) &saddr, sizeof(saddr))) { 98 perror("bind"); 99 exit(1); 100 } 101 if (connect(fds[0], (void *) &daddr, sizeof(daddr))) { 102 perror("connect"); 103 exit(1); 104 } 105 } 106 107 static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload) 108 { 109 char buf[DATA_LEN], rbuf[DATA_LEN]; 110 111 memset(buf, payload, sizeof(buf)); 112 while (num--) { 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); 116 exit(1); 117 } 118 if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) { 119 fprintf(stderr, "ERROR: recv failed left=%d\n", num); 120 exit(1); 121 } 122 if (memcmp(buf, rbuf, sizeof(buf))) { 123 fprintf(stderr, "ERROR: data failed left=%d\n", num); 124 exit(1); 125 } 126 } 127 } 128 129 static __maybe_unused void pair_udp_send(int fds[], int num) 130 { 131 return pair_udp_send_char(fds, num, DATA_CHAR); 132 } 133 134 static __maybe_unused void pair_udp_close(int fds[]) 135 { 136 close(fds[0]); 137 close(fds[1]); 138 } 139 140 #endif /* PSOCK_LIB_H */ 141