Commit | Line | Data |
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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 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/kmod.h> | |
9 | #include <linux/net.h> /* struct socket, struct proto_ops */ | |
10 | #include <linux/atm.h> /* ATM stuff */ | |
11 | #include <linux/atmdev.h> | |
12 | #include <linux/atmclip.h> /* CLIP_*ENCAP */ | |
13 | #include <linux/atmarp.h> /* manifest constants */ | |
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
4a3e2f71 | 20 | #include <linux/mutex.h> |
1da177e4 LT |
21 | #include <asm/ioctls.h> |
22 | ||
23 | #include "resources.h" | |
24 | #include "signaling.h" /* for WAITING and sigd_attach */ | |
295098e9 | 25 | #include "common.h" |
1da177e4 LT |
26 | |
27 | ||
4a3e2f71 | 28 | static DEFINE_MUTEX(ioctl_mutex); |
1da177e4 LT |
29 | static LIST_HEAD(ioctl_list); |
30 | ||
31 | ||
32 | void register_atm_ioctl(struct atm_ioctl *ioctl) | |
33 | { | |
4a3e2f71 | 34 | mutex_lock(&ioctl_mutex); |
1da177e4 | 35 | list_add_tail(&ioctl->list, &ioctl_list); |
4a3e2f71 | 36 | mutex_unlock(&ioctl_mutex); |
1da177e4 LT |
37 | } |
38 | ||
39 | void deregister_atm_ioctl(struct atm_ioctl *ioctl) | |
40 | { | |
4a3e2f71 | 41 | mutex_lock(&ioctl_mutex); |
1da177e4 | 42 | list_del(&ioctl->list); |
4a3e2f71 | 43 | mutex_unlock(&ioctl_mutex); |
1da177e4 LT |
44 | } |
45 | ||
46 | EXPORT_SYMBOL(register_atm_ioctl); | |
47 | EXPORT_SYMBOL(deregister_atm_ioctl); | |
48 | ||
49 | int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
50 | { | |
51 | struct sock *sk = sock->sk; | |
52 | struct atm_vcc *vcc; | |
53 | int error; | |
54 | struct list_head * pos; | |
55 | void __user *argp = (void __user *)arg; | |
56 | ||
57 | vcc = ATM_SD(sock); | |
58 | switch (cmd) { | |
59 | case SIOCOUTQ: | |
60 | if (sock->state != SS_CONNECTED || | |
61 | !test_bit(ATM_VF_READY, &vcc->flags)) { | |
62 | error = -EINVAL; | |
63 | goto done; | |
64 | } | |
65 | error = put_user(sk->sk_sndbuf - | |
66 | atomic_read(&sk->sk_wmem_alloc), | |
67 | (int __user *) argp) ? -EFAULT : 0; | |
68 | goto done; | |
69 | case SIOCINQ: | |
70 | { | |
71 | struct sk_buff *skb; | |
72 | ||
73 | if (sock->state != SS_CONNECTED) { | |
74 | error = -EINVAL; | |
75 | goto done; | |
76 | } | |
77 | skb = skb_peek(&sk->sk_receive_queue); | |
78 | error = put_user(skb ? skb->len : 0, | |
f7d57453 | 79 | (int __user *)argp) ? -EFAULT : 0; |
1da177e4 LT |
80 | goto done; |
81 | } | |
82 | case SIOCGSTAMP: /* borrowed from IP */ | |
83 | error = sock_get_timestamp(sk, argp); | |
84 | goto done; | |
85 | case ATM_SETSC: | |
86 | printk(KERN_WARNING "ATM_SETSC is obsolete\n"); | |
87 | error = 0; | |
88 | goto done; | |
89 | case ATMSIGD_CTRL: | |
90 | if (!capable(CAP_NET_ADMIN)) { | |
91 | error = -EPERM; | |
92 | goto done; | |
93 | } | |
94 | /* | |
95 | * The user/kernel protocol for exchanging signalling | |
96 | * info uses kernel pointers as opaque references, | |
97 | * so the holder of the file descriptor can scribble | |
98 | * on the kernel... so we should make sure that we | |
99 | * have the same privledges that /proc/kcore needs | |
100 | */ | |
101 | if (!capable(CAP_SYS_RAWIO)) { | |
102 | error = -EPERM; | |
103 | goto done; | |
104 | } | |
105 | error = sigd_attach(vcc); | |
106 | if (!error) | |
107 | sock->state = SS_CONNECTED; | |
108 | goto done; | |
e2c4b721 RK |
109 | case ATM_SETBACKEND: |
110 | case ATM_NEWBACKENDIF: | |
111 | { | |
112 | atm_backend_t backend; | |
113 | error = get_user(backend, (atm_backend_t __user *) argp); | |
114 | if (error) | |
115 | goto done; | |
116 | switch (backend) { | |
117 | case ATM_BACKEND_PPP: | |
118 | request_module("pppoatm"); | |
119 | break; | |
120 | case ATM_BACKEND_BR2684: | |
121 | request_module("br2684"); | |
122 | break; | |
123 | } | |
124 | } | |
125 | break; | |
126 | case ATMMPC_CTRL: | |
127 | case ATMMPC_DATA: | |
128 | request_module("mpoa"); | |
129 | break; | |
130 | case ATMARPD_CTRL: | |
131 | request_module("clip"); | |
132 | break; | |
133 | case ATMLEC_CTRL: | |
134 | request_module("lec"); | |
1da177e4 LT |
135 | break; |
136 | } | |
137 | ||
1da177e4 LT |
138 | error = -ENOIOCTLCMD; |
139 | ||
4a3e2f71 | 140 | mutex_lock(&ioctl_mutex); |
1da177e4 LT |
141 | list_for_each(pos, &ioctl_list) { |
142 | struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list); | |
143 | if (try_module_get(ic->owner)) { | |
144 | error = ic->ioctl(sock, cmd, arg); | |
145 | module_put(ic->owner); | |
146 | if (error != -ENOIOCTLCMD) | |
147 | break; | |
148 | } | |
149 | } | |
4a3e2f71 | 150 | mutex_unlock(&ioctl_mutex); |
1da177e4 LT |
151 | |
152 | if (error != -ENOIOCTLCMD) | |
153 | goto done; | |
154 | ||
155 | error = atm_dev_ioctl(cmd, argp); | |
156 | ||
157 | done: | |
158 | return error; | |
159 | } |