Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* ATM ioctl handling */ |
2 | ||
3 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ | |
4 | /* 2003 John Levon <levon@movementarian.org> */ | |
5 | ||
6 | ||
7 | #include <linux/config.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/kmod.h> | |
10 | #include <linux/net.h> /* struct socket, struct proto_ops */ | |
11 | #include <linux/atm.h> /* ATM stuff */ | |
12 | #include <linux/atmdev.h> | |
13 | #include <linux/atmclip.h> /* CLIP_*ENCAP */ | |
14 | #include <linux/atmarp.h> /* manifest constants */ | |
15 | #include <linux/sonet.h> /* for ioctls */ | |
16 | #include <linux/atmsvc.h> | |
17 | #include <linux/atmmpc.h> | |
18 | #include <net/atmclip.h> | |
19 | #include <linux/atmlec.h> | |
20 | #include <asm/ioctls.h> | |
21 | ||
22 | #include "resources.h" | |
23 | #include "signaling.h" /* for WAITING and sigd_attach */ | |
24 | ||
25 | ||
26 | static DECLARE_MUTEX(ioctl_mutex); | |
27 | static LIST_HEAD(ioctl_list); | |
28 | ||
29 | ||
30 | void register_atm_ioctl(struct atm_ioctl *ioctl) | |
31 | { | |
32 | down(&ioctl_mutex); | |
33 | list_add_tail(&ioctl->list, &ioctl_list); | |
34 | up(&ioctl_mutex); | |
35 | } | |
36 | ||
37 | void deregister_atm_ioctl(struct atm_ioctl *ioctl) | |
38 | { | |
39 | down(&ioctl_mutex); | |
40 | list_del(&ioctl->list); | |
41 | up(&ioctl_mutex); | |
42 | } | |
43 | ||
44 | EXPORT_SYMBOL(register_atm_ioctl); | |
45 | EXPORT_SYMBOL(deregister_atm_ioctl); | |
46 | ||
47 | int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
48 | { | |
49 | struct sock *sk = sock->sk; | |
50 | struct atm_vcc *vcc; | |
51 | int error; | |
52 | struct list_head * pos; | |
53 | void __user *argp = (void __user *)arg; | |
54 | ||
55 | vcc = ATM_SD(sock); | |
56 | switch (cmd) { | |
57 | case SIOCOUTQ: | |
58 | if (sock->state != SS_CONNECTED || | |
59 | !test_bit(ATM_VF_READY, &vcc->flags)) { | |
60 | error = -EINVAL; | |
61 | goto done; | |
62 | } | |
63 | error = put_user(sk->sk_sndbuf - | |
64 | atomic_read(&sk->sk_wmem_alloc), | |
65 | (int __user *) argp) ? -EFAULT : 0; | |
66 | goto done; | |
67 | case SIOCINQ: | |
68 | { | |
69 | struct sk_buff *skb; | |
70 | ||
71 | if (sock->state != SS_CONNECTED) { | |
72 | error = -EINVAL; | |
73 | goto done; | |
74 | } | |
75 | skb = skb_peek(&sk->sk_receive_queue); | |
76 | error = put_user(skb ? skb->len : 0, | |
77 | (int __user *)argp) ? -EFAULT : 0; | |
78 | goto done; | |
79 | } | |
80 | case SIOCGSTAMP: /* borrowed from IP */ | |
81 | error = sock_get_timestamp(sk, argp); | |
82 | goto done; | |
83 | case ATM_SETSC: | |
84 | printk(KERN_WARNING "ATM_SETSC is obsolete\n"); | |
85 | error = 0; | |
86 | goto done; | |
87 | case ATMSIGD_CTRL: | |
88 | if (!capable(CAP_NET_ADMIN)) { | |
89 | error = -EPERM; | |
90 | goto done; | |
91 | } | |
92 | /* | |
93 | * The user/kernel protocol for exchanging signalling | |
94 | * info uses kernel pointers as opaque references, | |
95 | * so the holder of the file descriptor can scribble | |
96 | * on the kernel... so we should make sure that we | |
97 | * have the same privledges that /proc/kcore needs | |
98 | */ | |
99 | if (!capable(CAP_SYS_RAWIO)) { | |
100 | error = -EPERM; | |
101 | goto done; | |
102 | } | |
103 | error = sigd_attach(vcc); | |
104 | if (!error) | |
105 | sock->state = SS_CONNECTED; | |
106 | goto done; | |
107 | default: | |
108 | break; | |
109 | } | |
110 | ||
111 | if (cmd == ATMMPC_CTRL || cmd == ATMMPC_DATA) | |
112 | request_module("mpoa"); | |
113 | if (cmd == ATMARPD_CTRL) | |
114 | request_module("clip"); | |
115 | if (cmd == ATMLEC_CTRL) | |
116 | request_module("lec"); | |
117 | ||
118 | error = -ENOIOCTLCMD; | |
119 | ||
120 | down(&ioctl_mutex); | |
121 | list_for_each(pos, &ioctl_list) { | |
122 | struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list); | |
123 | if (try_module_get(ic->owner)) { | |
124 | error = ic->ioctl(sock, cmd, arg); | |
125 | module_put(ic->owner); | |
126 | if (error != -ENOIOCTLCMD) | |
127 | break; | |
128 | } | |
129 | } | |
130 | up(&ioctl_mutex); | |
131 | ||
132 | if (error != -ENOIOCTLCMD) | |
133 | goto done; | |
134 | ||
135 | error = atm_dev_ioctl(cmd, argp); | |
136 | ||
137 | done: | |
138 | return error; | |
139 | } |