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
21enum request_type { REQ_NEW_CONTROL };
22
23#define SWITCH_MAGIC 0xfeedface
24
25struct request_v3 {
26	uint32_t magic;
27	uint32_t version;
28	enum request_type type;
29	struct sockaddr_un sock;
30};
31
32static 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
47static 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
125static 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
154static int daemon_open(void *data)
155{
156	struct daemon_data *pri = data;
157	return pri->fd;
158}
159
160static 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
177int 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
184const 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