tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL.
4 */
5
6#include <unistd.h>
7#include <errno.h>
8#include <string.h>
9#include <sys/wait.h>
10#include "kern_constants.h"
11#include "net_user.h"
12#include "os.h"
13#include "slirp.h"
14#include "user.h"
15
16static int slirp_user_init(void *data, void *dev)
17{
18 struct slirp_data *pri = data;
19
20 pri->dev = dev;
21 return 0;
22}
23
24struct slirp_pre_exec_data {
25 int stdin;
26 int stdout;
27};
28
29static void slirp_pre_exec(void *arg)
30{
31 struct slirp_pre_exec_data *data = arg;
32
33 if (data->stdin != -1)
34 dup2(data->stdin, 0);
35 if (data->stdout != -1)
36 dup2(data->stdout, 1);
37}
38
39static int slirp_tramp(char **argv, int fd)
40{
41 struct slirp_pre_exec_data pe_data;
42 int pid;
43
44 pe_data.stdin = fd;
45 pe_data.stdout = fd;
46 pid = run_helper(slirp_pre_exec, &pe_data, argv);
47
48 return pid;
49}
50
51static int slirp_open(void *data)
52{
53 struct slirp_data *pri = data;
54 int fds[2], pid, err;
55
56 err = os_pipe(fds, 1, 1);
57 if (err)
58 return err;
59
60 err = slirp_tramp(pri->argw.argv, fds[1]);
61 if (err < 0) {
62 printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
63 goto out;
64 }
65 pid = err;
66
67 pri->slave = fds[1];
68 pri->slip.pos = 0;
69 pri->slip.esc = 0;
70 pri->pid = err;
71
72 return fds[0];
73out:
74 close(fds[0]);
75 close(fds[1]);
76 return err;
77}
78
79static void slirp_close(int fd, void *data)
80{
81 struct slirp_data *pri = data;
82 int err;
83
84 close(fd);
85 close(pri->slave);
86
87 pri->slave = -1;
88
89 if (pri->pid<1) {
90 printk(UM_KERN_ERR "slirp_close: no child process to shut "
91 "down\n");
92 return;
93 }
94
95#if 0
96 if (kill(pri->pid, SIGHUP)<0) {
97 printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
98 "(%d)\n", pri->pid, errno);
99 }
100#endif
101 err = helper_wait(pri->pid);
102 if (err < 0)
103 return;
104
105 pri->pid = -1;
106}
107
108int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
109{
110 return slip_proto_read(fd, buf, len, &pri->slip);
111}
112
113int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
114{
115 return slip_proto_write(fd, buf, len, &pri->slip);
116}
117
118const struct net_user_info slirp_user_info = {
119 .init = slirp_user_init,
120 .open = slirp_open,
121 .close = slirp_close,
122 .remove = NULL,
123 .add_address = NULL,
124 .delete_address = NULL,
125 .mtu = BUF_SIZE,
126 .max_packet = BUF_SIZE,
127};