1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
4 */
5
6 #include <stddef.h>
7 #include <errno.h>
8 #include <libvdeplug.h>
9 #include <net_user.h>
10 #include <um_malloc.h>
11 #include "vde.h"
12
13 static int vde_user_init(void *data, void *dev)
14 {
15 struct vde_data *pri = data;
16 VDECONN *conn = NULL;
17 int err = -EINVAL;
18
19 pri->dev = dev;
20
21 conn = vde_open(pri->vde_switch, pri->descr, pri->args);
22
23 if (conn == NULL) {
24 err = -errno;
25 printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
26 "errno = %d\n", errno);
27 return err;
28 }
29
30 printk(UM_KERN_INFO "vde backend - connection opened\n");
31
32 pri->conn = conn;
33
34 return 0;
35 }
36
37 static int vde_user_open(void *data)
38 {
39 struct vde_data *pri = data;
40
41 if (pri->conn != NULL)
42 return vde_datafd(pri->conn);
43
44 printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
45 return -EINVAL;
46 }
47
48 static void vde_remove(void *data)
49 {
50 struct vde_data *pri = data;
51
52 if (pri->conn != NULL) {
53 printk(UM_KERN_INFO "vde backend - closing connection\n");
54 vde_close(pri->conn);
55 pri->conn = NULL;
56 kfree(pri->args);
57 pri->args = NULL;
58 return;
59 }
60
61 printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
62 }
63
64 const struct net_user_info vde_user_info = {
65 .init = vde_user_init,
66 .open = vde_user_open,
67 .close = NULL,
68 .remove = vde_remove,
69 .add_address = NULL,
70 .delete_address = NULL,
71 .mtu = ETH_MAX_PACKET,
72 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
73 };
74
75 void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
76 {
77 struct vde_open_args *args;
78
79 vpri->args = uml_kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
80 if (vpri->args == NULL) {
81 printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args "
82 "allocation failed");
83 return;
84 }
85
86 args = vpri->args;
87
88 args->port = init->port;
89 args->group = init->group;
90 args->mode = init->mode ? init->mode : 0700;
91
92 args->port ? printk("port %d", args->port) :
93 printk("undefined port");
94 }
95
96 int vde_user_read(void *conn, void *buf, int len)
97 {
98 VDECONN *vconn = conn;
99 int rv;
100
101 if (vconn == NULL)
102 return 0;
103
104 rv = vde_recv(vconn, buf, len, 0);
105 if (rv < 0) {
106 if (errno == EAGAIN)
107 return 0;
108 return -errno;
109 }
110 else if (rv == 0)
111 return -ENOTCONN;
112
113 return rv;
114 }
115
116 int vde_user_write(void *conn, void *buf, int len)
117 {
118 VDECONN *vconn = conn;
119
120 if (vconn == NULL)
121 return 0;
122
123 return vde_send(vconn, buf, len, 0);
124 }
125
126
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