1 /*
2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
4 * James Leu (jleu@mindspring.net).
5 * Copyright (C) 2001 by various other people who didn't put their name here.
6 * Licensed under the GPL.
7 */
8
9 #include <stdint.h>
10 #include <unistd.h>
11 #include <errno.h>
12 #include <sys/types.h>
13 #include <sys/socket.h>
14 #include <sys/time.h>
15 #include <sys/un.h>
16 #include "daemon.h"
17 #include <net_user.h>
18 #include <os.h>
19 #include <um_malloc.h>
20
21 enum request_type { REQ_NEW_CONTROL };
22
23 #define SWITCH_MAGIC 0xfeedface
24
25 struct request_v3 {
26 uint32_t magic;
27 uint32_t version;
28 enum request_type type;
29 struct sockaddr_un sock;
30 };
31
new_addr(void * name,int len)32 static struct sockaddr_un *new_addr(void *name, int len)
33 {
34 struct sockaddr_un *sun;
35
36 sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
37 if (sun == NULL) {
38 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
39 "failed\n");
40 return NULL;
41 }
42 sun->sun_family = AF_UNIX;
43 memcpy(sun->sun_path, name, len);
44 return sun;
45 }
46
connect_to_switch(struct daemon_data * pri)47 static int connect_to_switch(struct daemon_data *pri)
48 {
49 struct sockaddr_un *ctl_addr = pri->ctl_addr;
50 struct sockaddr_un *local_addr = pri->local_addr;
51 struct sockaddr_un *sun;
52 struct request_v3 req;
53 int fd, n, err;
54
55 pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
56 if (pri->control < 0) {
57 err = -errno;
58 printk(UM_KERN_ERR "daemon_open : control socket failed, "
59 "errno = %d\n", -err);
60 return err;
61 }
62
63 if (connect(pri->control, (struct sockaddr *) ctl_addr,
64 sizeof(*ctl_addr)) < 0) {
65 err = -errno;
66 printk(UM_KERN_ERR "daemon_open : control connect failed, "
67 "errno = %d\n", -err);
68 goto out;
69 }
70
71 fd = socket(AF_UNIX, SOCK_DGRAM, 0);
72 if (fd < 0) {
73 err = -errno;
74 printk(UM_KERN_ERR "daemon_open : data socket failed, "
75 "errno = %d\n", -err);
76 goto out;
77 }
78 if (bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0) {
79 err = -errno;
80 printk(UM_KERN_ERR "daemon_open : data bind failed, "
81 "errno = %d\n", -err);
82 goto out_close;
83 }
84
85 sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
86 if (sun == NULL) {
87 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
88 "failed\n");
89 err = -ENOMEM;
90 goto out_close;
91 }
92
93 req.magic = SWITCH_MAGIC;
94 req.version = SWITCH_VERSION;
95 req.type = REQ_NEW_CONTROL;
96 req.sock = *local_addr;
97 n = write(pri->control, &req, sizeof(req));
98 if (n != sizeof(req)) {
99 printk(UM_KERN_ERR "daemon_open : control setup request "
100 "failed, err = %d\n", -errno);
101 err = -ENOTCONN;
102 goto out_free;
103 }
104
105 n = read(pri->control, sun, sizeof(*sun));
106 if (n != sizeof(*sun)) {
107 printk(UM_KERN_ERR "daemon_open : read of data socket failed, "
108 "err = %d\n", -errno);
109 err = -ENOTCONN;
110 goto out_free;
111 }
112
113 pri->data_addr = sun;
114 return fd;
115
116 out_free:
117 kfree(sun);
118 out_close:
119 close(fd);
120 out:
121 close(pri->control);
122 return err;
123 }
124
daemon_user_init(void * data,void * dev)125 static int daemon_user_init(void *data, void *dev)
126 {
127 struct daemon_data *pri = data;
128 struct timeval tv;
129 struct {
130 char zero;
131 int pid;
132 int usecs;
133 } name;
134
135 if (!strcmp(pri->sock_type, "unix"))
136 pri->ctl_addr = new_addr(pri->ctl_sock,
137 strlen(pri->ctl_sock) + 1);
138 name.zero = 0;
139 name.pid = os_getpid();
140 gettimeofday(&tv, NULL);
141 name.usecs = tv.tv_usec;
142 pri->local_addr = new_addr(&name, sizeof(name));
143 pri->dev = dev;
144 pri->fd = connect_to_switch(pri);
145 if (pri->fd < 0) {
146 kfree(pri->local_addr);
147 pri->local_addr = NULL;
148 return pri->fd;
149 }
150
151 return 0;
152 }
153
daemon_open(void * data)154 static int daemon_open(void *data)
155 {
156 struct daemon_data *pri = data;
157 return pri->fd;
158 }
159
daemon_remove(void * data)160 static void daemon_remove(void *data)
161 {
162 struct daemon_data *pri = data;
163
164 close(pri->fd);
165 pri->fd = -1;
166 close(pri->control);
167 pri->control = -1;
168
169 kfree(pri->data_addr);
170 pri->data_addr = NULL;
171 kfree(pri->ctl_addr);
172 pri->ctl_addr = NULL;
173 kfree(pri->local_addr);
174 pri->local_addr = NULL;
175 }
176
daemon_user_write(int fd,void * buf,int len,struct daemon_data * pri)177 int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
178 {
179 struct sockaddr_un *data_addr = pri->data_addr;
180
181 return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
182 }
183
184 const struct net_user_info daemon_user_info = {
185 .init = daemon_user_init,
186 .open = daemon_open,
187 .close = NULL,
188 .remove = daemon_remove,
189 .add_address = NULL,
190 .delete_address = NULL,
191 .mtu = ETH_MAX_PACKET,
192 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
193 };
194
