1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// SPDX-License-Identifier: AGPL-3.0-or-later
/* PASST - Plug A Simple Socket Transport
*
* qrap.c - qemu wrapper connecting UNIX domain socket to socket file descriptor
*
* Copyright (c) 2020-2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*
* TODO: Implement this functionality directly in qemu: we have TCP and UDP
* socket back-ends already.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <linux/if_ether.h>
#include <linux/ipv6.h>
#include <linux/limits.h>
#include <limits.h>
#include <net/if.h>
#include "passt.h"
#define STRINGIFY(x) #x
#define STR(x) STRINGIFY(x)
static char *qemu_names[] = {
"kvm",
"qemu-kvm",
#ifdef ARCH
"qemu-system-" ARCH,
#endif
"/usr/libexec/qemu-kvm",
NULL,
};
static const struct drop_arg {
char *name;
char *val;
} drop_args[] = {
{ "-netdev", NULL },
{ "-net", NULL },
{ "-device", "virtio-net-pci," },
{ "-device", "virtio-net-ccw," },
{ "-device", "e1000," },
{ "-device", "e1000e," },
{ "-device", "rtl8139," },
{ 0 },
};
static const struct pci_dev {
char *mach;
char *name;
char *template;
char *template_post;
int first;
int last;
} pci_devs[] = {
{ "pc-q35", "virtio-net-pci",
"bus=pci.", ",addr=0x0", 1, 16 },
{ "pc-", "virtio-net-pci",
"bus=pci.0,addr=0x", "", 2, /* 1: ISA bridge */ 16 },
{ "s390-ccw", "virtio-net-ccw",
"devno=fe.0.", "", 1, 16 },
{ 0 },
};
#define DEFAULT_FD 5
/**
* usage() - Print usage and exit
* @name: Executable name
*/
void usage(const char *name)
{
fprintf(stderr, "Usage: %s [FDNUM QEMU_CMD] ...\n", name);
fprintf(stderr, "\n");
fprintf(stderr, "If first and second arguments aren't a socket number\n"
"and a path, %s will try to locate a qemu binary\n"
"and directly patch the command line\n", name);
exit(EXIT_FAILURE);
}
/**
* main() - Entry point and main loop
* @argc: Argument count
* @argv: File descriptor number, then qemu with arguments
*
* Return: 0 once interrupted, non-zero on failure
*/
int main(int argc, char **argv)
{
char *qemu_argv[ARG_MAX], dev_str[ARG_MAX];
int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0;
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = UNIX_SOCK_PATH,
};
const struct pci_dev *dev = NULL;
long fd;
if (argc >= 3) {
fd = strtol(argv[1], NULL, 0);
if (fd >= 3 && fd < INT_MAX && !errno) {
char env_path[ARG_MAX], *p, command[ARG_MAX];
strncpy(env_path, getenv("PATH"), ARG_MAX);
p = strtok(env_path, ":");
while (p) {
snprintf(command, ARG_MAX, "%s/%s", p, argv[2]);
if (!access(command, X_OK))
goto valid_args;
p = strtok(NULL, ":");
}
}
}
fd = DEFAULT_FD;
for (i = 1; i < argc - 1; i++) {
if (strcmp(argv[i], "-machine"))
continue;
for (dev = pci_devs; dev->mach; dev++) {
if (strstr(argv[i + 1], dev->mach) == argv[i + 1])
break;
}
}
if (!dev || !dev->mach)
dev = pci_devs;
for (qemu_argc = 1, i = 1; i < argc; i++) {
const struct drop_arg *a;
for (a = drop_args; a->name; a++) {
if (!strcmp(argv[i], a->name)) {
if (!a->val)
break;
if (i + 1 < argc &&
strstr(argv[i + 1], a->val) == argv[i + 1])
break;
}
}
if (a->name) {
i++;
continue;
}
if (!strcmp(argv[i], "-device") && i + 1 < argc) {
char *p;
long n;
has_dev = 1;
if ((p = strstr(argv[i + 1], dev->template))) {
n = strtol(p + strlen(dev->template), NULL, 16);
if (!errno)
addr_map |= (1 << n);
}
}
qemu_argv[qemu_argc++] = argv[i];
}
for (i = dev->first; i < dev->last; i++) {
if (!(addr_map & (1 << i)))
break;
}
if (i == dev->last) {
fprintf(stderr, "Couldn't find free address for device\n");
usage(argv[0]);
}
if (has_dev) {
qemu_argv[qemu_argc++] = "-device";
snprintf(dev_str, ARG_MAX, "%s,%s%x%s,netdev=hostnet0",
dev->name, dev->template, i, dev->template_post);
qemu_argv[qemu_argc++] = dev_str;
}
qemu_argv[qemu_argc++] = "-netdev";
qemu_argv[qemu_argc++] = "socket,fd=" STR(DEFAULT_FD) ",id=hostnet0";
qemu_argv[qemu_argc] = NULL;
valid_args:
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
if (connect(s, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("connect");
exit(EXIT_FAILURE);
}
if (dup2(s, (int)fd) < 0) {
perror("dup");
exit(EXIT_FAILURE);
}
close(s);
if (qemu_argc) {
char **name;
for (name = qemu_names; *name; name++) {
qemu_argv[0] = *name;
execvp(*name, qemu_argv);
if (errno != ENOENT) {
perror("execvp");
usage(argv[0]);
}
}
if (errno == ENOENT)
fprintf(stderr, "Couldn't find qemu command\n");
} else {
execvp(argv[2], argv + 2);
}
perror("execvp");
return EXIT_FAILURE;
}
|
