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107d0d9b RDC |
1 | /* |
2 | * File: datagram.c | |
3 | * | |
4 | * Datagram (ISI) Phonet sockets | |
5 | * | |
6 | * Copyright (C) 2008 Nokia Corporation. | |
7 | * | |
31fdc555 RDC |
8 | * Authors: Sakari Ailus <sakari.ailus@nokia.com> |
9 | * Rémi Denis-Courmont | |
107d0d9b RDC |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
107d0d9b RDC |
28 | #include <linux/socket.h> |
29 | #include <asm/ioctls.h> | |
30 | #include <net/sock.h> | |
31 | ||
32 | #include <linux/phonet.h> | |
bc3b2d7f | 33 | #include <linux/export.h> |
107d0d9b RDC |
34 | #include <net/phonet/phonet.h> |
35 | ||
36 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
37 | ||
38 | /* associated socket ceases to exist */ | |
39 | static void pn_sock_close(struct sock *sk, long timeout) | |
40 | { | |
41 | sk_common_release(sk); | |
42 | } | |
43 | ||
44 | static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
45 | { | |
46 | struct sk_buff *skb; | |
47 | int answ; | |
48 | ||
49 | switch (cmd) { | |
50 | case SIOCINQ: | |
51 | lock_sock(sk); | |
52 | skb = skb_peek(&sk->sk_receive_queue); | |
53 | answ = skb ? skb->len : 0; | |
54 | release_sock(sk); | |
55 | return put_user(answ, (int __user *)arg); | |
7417fa83 RDC |
56 | |
57 | case SIOCPNADDRESOURCE: | |
58 | case SIOCPNDELRESOURCE: { | |
59 | u32 res; | |
60 | if (get_user(res, (u32 __user *)arg)) | |
61 | return -EFAULT; | |
62 | if (res >= 256) | |
63 | return -EINVAL; | |
64 | if (cmd == SIOCPNADDRESOURCE) | |
65 | return pn_sock_bind_res(sk, res); | |
66 | else | |
67 | return pn_sock_unbind_res(sk, res); | |
68 | } | |
107d0d9b RDC |
69 | } |
70 | ||
71 | return -ENOIOCTLCMD; | |
72 | } | |
73 | ||
74 | /* Destroy socket. All references are gone. */ | |
75 | static void pn_destruct(struct sock *sk) | |
76 | { | |
77 | skb_queue_purge(&sk->sk_receive_queue); | |
78 | } | |
79 | ||
80 | static int pn_init(struct sock *sk) | |
81 | { | |
82 | sk->sk_destruct = pn_destruct; | |
83 | return 0; | |
84 | } | |
85 | ||
1b784140 | 86 | static int pn_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
107d0d9b | 87 | { |
342dfc30 | 88 | DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name); |
107d0d9b RDC |
89 | struct sk_buff *skb; |
90 | int err; | |
91 | ||
82ecbcb9 RDC |
92 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
93 | MSG_CMSG_COMPAT)) | |
107d0d9b RDC |
94 | return -EOPNOTSUPP; |
95 | ||
342dfc30 | 96 | if (target == NULL) |
107d0d9b RDC |
97 | return -EDESTADDRREQ; |
98 | ||
99 | if (msg->msg_namelen < sizeof(struct sockaddr_pn)) | |
100 | return -EINVAL; | |
101 | ||
107d0d9b RDC |
102 | if (target->spn_family != AF_PHONET) |
103 | return -EAFNOSUPPORT; | |
104 | ||
105 | skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len, | |
106 | msg->msg_flags & MSG_DONTWAIT, &err); | |
107 | if (skb == NULL) | |
108 | return err; | |
109 | skb_reserve(skb, MAX_PHONET_HEADER); | |
110 | ||
6ce8e9ce | 111 | err = memcpy_from_msg((void *)skb_put(skb, len), msg, len); |
107d0d9b RDC |
112 | if (err < 0) { |
113 | kfree_skb(skb); | |
114 | return err; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Fill in the Phonet header and | |
119 | * finally pass the packet forwards. | |
120 | */ | |
121 | err = pn_skb_send(sk, skb, target); | |
122 | ||
123 | /* If ok, return len. */ | |
124 | return (err >= 0) ? len : err; | |
125 | } | |
126 | ||
1b784140 YX |
127 | static int pn_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
128 | int noblock, int flags, int *addr_len) | |
107d0d9b RDC |
129 | { |
130 | struct sk_buff *skb = NULL; | |
131 | struct sockaddr_pn sa; | |
132 | int rval = -EOPNOTSUPP; | |
133 | int copylen; | |
134 | ||
82ecbcb9 RDC |
135 | if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL| |
136 | MSG_CMSG_COMPAT)) | |
107d0d9b RDC |
137 | goto out_nofree; |
138 | ||
107d0d9b RDC |
139 | skb = skb_recv_datagram(sk, flags, noblock, &rval); |
140 | if (skb == NULL) | |
141 | goto out_nofree; | |
142 | ||
143 | pn_skb_get_src_sockaddr(skb, &sa); | |
144 | ||
145 | copylen = skb->len; | |
146 | if (len < copylen) { | |
147 | msg->msg_flags |= MSG_TRUNC; | |
148 | copylen = len; | |
149 | } | |
150 | ||
51f3d02b | 151 | rval = skb_copy_datagram_msg(skb, 0, msg, copylen); |
107d0d9b RDC |
152 | if (rval) { |
153 | rval = -EFAULT; | |
154 | goto out; | |
155 | } | |
156 | ||
157 | rval = (flags & MSG_TRUNC) ? skb->len : copylen; | |
158 | ||
bceaa902 | 159 | if (msg->msg_name != NULL) { |
342dfc30 | 160 | __sockaddr_check_size(sizeof(sa)); |
bceaa902 HFS |
161 | memcpy(msg->msg_name, &sa, sizeof(sa)); |
162 | *addr_len = sizeof(sa); | |
163 | } | |
107d0d9b RDC |
164 | |
165 | out: | |
166 | skb_free_datagram(sk, skb); | |
167 | ||
168 | out_nofree: | |
169 | return rval; | |
170 | } | |
171 | ||
172 | /* Queue an skb for a sock. */ | |
173 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb) | |
174 | { | |
175 | int err = sock_queue_rcv_skb(sk, skb); | |
766e9037 ED |
176 | |
177 | if (err < 0) | |
107d0d9b RDC |
178 | kfree_skb(skb); |
179 | return err ? NET_RX_DROP : NET_RX_SUCCESS; | |
180 | } | |
181 | ||
182 | /* Module registration */ | |
183 | static struct proto pn_proto = { | |
184 | .close = pn_sock_close, | |
185 | .ioctl = pn_ioctl, | |
186 | .init = pn_init, | |
187 | .sendmsg = pn_sendmsg, | |
188 | .recvmsg = pn_recvmsg, | |
189 | .backlog_rcv = pn_backlog_rcv, | |
190 | .hash = pn_sock_hash, | |
191 | .unhash = pn_sock_unhash, | |
192 | .get_port = pn_sock_get_port, | |
193 | .obj_size = sizeof(struct pn_sock), | |
194 | .owner = THIS_MODULE, | |
195 | .name = "PHONET", | |
196 | }; | |
197 | ||
198 | static struct phonet_protocol pn_dgram_proto = { | |
199 | .ops = &phonet_dgram_ops, | |
200 | .prot = &pn_proto, | |
201 | .sock_type = SOCK_DGRAM, | |
202 | }; | |
203 | ||
204 | int __init isi_register(void) | |
205 | { | |
206 | return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto); | |
207 | } | |
208 | ||
209 | void __exit isi_unregister(void) | |
210 | { | |
211 | phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto); | |
212 | } |