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 | |