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1 | /* |
2 | * File: datagram.c |
3 | * |
4 | * Datagram (ISI) Phonet sockets |
5 | * |
6 | * Copyright (C) 2008 Nokia Corporation. |
7 | * |
8 | * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com> |
9 | * Original author: Sakari Ailus <sakari.ailus@nokia.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU General Public License |
13 | * version 2 as published by the Free Software Foundation. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, but |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
18 | * General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
23 | * 02110-1301 USA |
24 | */ |
25 | |
26 | #include <linux/kernel.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/socket.h> |
29 | #include <asm/ioctls.h> |
30 | #include <net/sock.h> |
31 | |
32 | #include <linux/phonet.h> |
33 | #include <net/phonet/phonet.h> |
34 | |
35 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
36 | |
37 | /* associated socket ceases to exist */ |
38 | static void pn_sock_close(struct sock *sk, long timeout) |
39 | { |
40 | sk_common_release(sk); |
41 | } |
42 | |
43 | static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg) |
44 | { |
45 | struct sk_buff *skb; |
46 | int answ; |
47 | |
48 | switch (cmd) { |
49 | case SIOCINQ: |
50 | lock_sock(sk); |
51 | skb = skb_peek(&sk->sk_receive_queue); |
52 | answ = skb ? skb->len : 0; |
53 | release_sock(sk); |
54 | return put_user(answ, (int __user *)arg); |
55 | |
56 | case SIOCPNADDRESOURCE: |
57 | case SIOCPNDELRESOURCE: { |
58 | u32 res; |
59 | if (get_user(res, (u32 __user *)arg)) |
60 | return -EFAULT; |
61 | if (res >= 256) |
62 | return -EINVAL; |
63 | if (cmd == SIOCPNADDRESOURCE) |
64 | return pn_sock_bind_res(sk, res); |
65 | else |
66 | return pn_sock_unbind_res(sk, res); |
67 | } |
68 | } |
69 | |
70 | return -ENOIOCTLCMD; |
71 | } |
72 | |
73 | /* Destroy socket. All references are gone. */ |
74 | static void pn_destruct(struct sock *sk) |
75 | { |
76 | skb_queue_purge(&sk->sk_receive_queue); |
77 | } |
78 | |
79 | static int pn_init(struct sock *sk) |
80 | { |
81 | sk->sk_destruct = pn_destruct; |
82 | return 0; |
83 | } |
84 | |
85 | static int pn_sendmsg(struct kiocb *iocb, struct sock *sk, |
86 | struct msghdr *msg, size_t len) |
87 | { |
88 | struct sockaddr_pn *target; |
89 | struct sk_buff *skb; |
90 | int err; |
91 | |
92 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
93 | MSG_CMSG_COMPAT)) |
94 | return -EOPNOTSUPP; |
95 | |
96 | if (msg->msg_name == NULL) |
97 | return -EDESTADDRREQ; |
98 | |
99 | if (msg->msg_namelen < sizeof(struct sockaddr_pn)) |
100 | return -EINVAL; |
101 | |
102 | target = (struct sockaddr_pn *)msg->msg_name; |
103 | if (target->spn_family != AF_PHONET) |
104 | return -EAFNOSUPPORT; |
105 | |
106 | skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len, |
107 | msg->msg_flags & MSG_DONTWAIT, &err); |
108 | if (skb == NULL) |
109 | return err; |
110 | skb_reserve(skb, MAX_PHONET_HEADER); |
111 | |
112 | err = memcpy_fromiovec((void *)skb_put(skb, len), msg->msg_iov, len); |
113 | if (err < 0) { |
114 | kfree_skb(skb); |
115 | return err; |
116 | } |
117 | |
118 | /* |
119 | * Fill in the Phonet header and |
120 | * finally pass the packet forwards. |
121 | */ |
122 | err = pn_skb_send(sk, skb, target); |
123 | |
124 | /* If ok, return len. */ |
125 | return (err >= 0) ? len : err; |
126 | } |
127 | |
128 | static int pn_recvmsg(struct kiocb *iocb, struct sock *sk, |
129 | struct msghdr *msg, size_t len, int noblock, |
130 | int flags, int *addr_len) |
131 | { |
132 | struct sk_buff *skb = NULL; |
133 | struct sockaddr_pn sa; |
134 | int rval = -EOPNOTSUPP; |
135 | int copylen; |
136 | |
137 | if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL| |
138 | MSG_CMSG_COMPAT)) |
139 | goto out_nofree; |
140 | |
141 | if (addr_len) |
142 | *addr_len = sizeof(sa); |
143 | |
144 | skb = skb_recv_datagram(sk, flags, noblock, &rval); |
145 | if (skb == NULL) |
146 | goto out_nofree; |
147 | |
148 | pn_skb_get_src_sockaddr(skb, &sa); |
149 | |
150 | copylen = skb->len; |
151 | if (len < copylen) { |
152 | msg->msg_flags |= MSG_TRUNC; |
153 | copylen = len; |
154 | } |
155 | |
156 | rval = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copylen); |
157 | if (rval) { |
158 | rval = -EFAULT; |
159 | goto out; |
160 | } |
161 | |
162 | rval = (flags & MSG_TRUNC) ? skb->len : copylen; |
163 | |
164 | if (msg->msg_name != NULL) |
165 | memcpy(msg->msg_name, &sa, sizeof(struct sockaddr_pn)); |
166 | |
167 | out: |
168 | skb_free_datagram(sk, skb); |
169 | |
170 | out_nofree: |
171 | return rval; |
172 | } |
173 | |
174 | /* Queue an skb for a sock. */ |
175 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
176 | { |
177 | int err = sock_queue_rcv_skb(sk, skb); |
178 | |
179 | if (err < 0) |
180 | kfree_skb(skb); |
181 | return err ? NET_RX_DROP : NET_RX_SUCCESS; |
182 | } |
183 | |
184 | /* Module registration */ |
185 | static struct proto pn_proto = { |
186 | .close = pn_sock_close, |
187 | .ioctl = pn_ioctl, |
188 | .init = pn_init, |
189 | .sendmsg = pn_sendmsg, |
190 | .recvmsg = pn_recvmsg, |
191 | .backlog_rcv = pn_backlog_rcv, |
192 | .hash = pn_sock_hash, |
193 | .unhash = pn_sock_unhash, |
194 | .get_port = pn_sock_get_port, |
195 | .obj_size = sizeof(struct pn_sock), |
196 | .owner = THIS_MODULE, |
197 | .name = "PHONET", |
198 | }; |
199 | |
200 | static struct phonet_protocol pn_dgram_proto = { |
201 | .ops = &phonet_dgram_ops, |
202 | .prot = &pn_proto, |
203 | .sock_type = SOCK_DGRAM, |
204 | }; |
205 | |
206 | int __init isi_register(void) |
207 | { |
208 | return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto); |
209 | } |
210 | |
211 | void __exit isi_unregister(void) |
212 | { |
213 | phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto); |
214 | } |
215 |
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