1 /*
2 * Copyright (c) 2018 Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 /**
8 * @file
9 *
10 * Routines setting up the host system. Those are placed in a separate file
11 * to avoid naming conflicts between host and zephyr network stacks.
12 * This file is built with the host libC in the native simulator runner context.
13 */
14
15 /* Host include files */
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <stdarg.h>
19 #include <errno.h>
20 #include <string.h>
21 #include <stdbool.h>
22 #include <unistd.h>
23 #include <fcntl.h>
24 #include <sys/ioctl.h>
25 #include <sys/socket.h>
26 #include <sys/select.h>
27 #include <net/if.h>
28 #include <time.h>
29 #include <inttypes.h>
30 #include <nsi_tracing.h>
31
32 #ifdef __linux
33 #include <linux/if.h>
34 #include <linux/if_tun.h>
35 #endif
36
37 #include "eth_native_tap_priv.h"
38
39 /* Note that we cannot create the TUN/TAP device from the setup script
40 * as we need to get a file descriptor to communicate with the interface.
41 */
eth_iface_create(const char * dev_name,const char * if_name,bool tun_only)42 int eth_iface_create(const char *dev_name, const char *if_name, bool tun_only)
43 {
44 struct ifreq ifr;
45 int fd, ret = -EINVAL;
46
47 fd = open(dev_name, O_RDWR);
48 if (fd < 0) {
49 return -errno;
50 }
51
52 (void)memset(&ifr, 0, sizeof(ifr));
53
54 #ifdef __linux
55 ifr.ifr_flags = (tun_only ? IFF_TUN : IFF_TAP) | IFF_NO_PI;
56
57 strncpy(ifr.ifr_name, if_name, IFNAMSIZ - 1);
58
59 ret = ioctl(fd, TUNSETIFF, (void *)&ifr);
60 if (ret < 0) {
61 ret = -errno;
62 close(fd);
63 return ret;
64 }
65 #endif
66
67 return fd;
68 }
69
eth_iface_remove(int fd)70 int eth_iface_remove(int fd)
71 {
72 return close(fd);
73 }
74
75 static int ssystem(const char *fmt, ...)
76 __attribute__((__format__(__printf__, 1, 2)));
77
ssystem(const char * fmt,...)78 static int ssystem(const char *fmt, ...)
79 {
80 char cmd[255];
81 va_list ap;
82 int ret;
83
84 va_start(ap, fmt);
85 vsnprintf(cmd, sizeof(cmd), fmt, ap);
86 va_end(ap);
87
88 nsi_print_trace("%s\n", cmd);
89
90 ret = system(cmd);
91
92 return -WEXITSTATUS(ret);
93 }
94
eth_wait_data(int fd)95 int eth_wait_data(int fd)
96 {
97 struct timeval timeout;
98 fd_set rset;
99 int ret;
100
101 FD_ZERO(&rset);
102
103 FD_SET(fd, &rset);
104
105 timeout.tv_sec = 0;
106 timeout.tv_usec = 0;
107
108 ret = select(fd + 1, &rset, NULL, NULL, &timeout);
109 if (ret < 0 && errno != EINTR) {
110 return -errno;
111 } else if (ret > 0) {
112 if (FD_ISSET(fd, &rset)) {
113 return 0;
114 }
115 }
116
117 return -EAGAIN;
118 }
119
eth_clock_gettime(uint64_t * second,uint32_t * nanosecond)120 int eth_clock_gettime(uint64_t *second, uint32_t *nanosecond)
121 {
122 struct timespec tp;
123 int ret;
124
125 ret = clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
126 if (ret < 0) {
127 return -errno;
128 }
129
130 *second = (uint64_t)tp.tv_sec;
131 *nanosecond = (uint32_t)tp.tv_nsec;
132
133 return 0;
134 }
135
eth_promisc_mode(const char * if_name,bool enable)136 int eth_promisc_mode(const char *if_name, bool enable)
137 {
138 return ssystem("ip link set dev %s promisc %s",
139 if_name, enable ? "on" : "off");
140 }
141
