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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 | * | |
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> | |
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> | |
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 | ||
57 | return -ENOIOCTLCMD; | |
58 | } | |
59 | ||
60 | /* Destroy socket. All references are gone. */ | |
61 | static void pn_destruct(struct sock *sk) | |
62 | { | |
63 | skb_queue_purge(&sk->sk_receive_queue); | |
64 | } | |
65 | ||
66 | static int pn_init(struct sock *sk) | |
67 | { | |
68 | sk->sk_destruct = pn_destruct; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int pn_sendmsg(struct kiocb *iocb, struct sock *sk, | |
73 | struct msghdr *msg, size_t len) | |
74 | { | |
75 | struct sockaddr_pn *target; | |
76 | struct sk_buff *skb; | |
77 | int err; | |
78 | ||
82ecbcb9 RDC |
79 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
80 | MSG_CMSG_COMPAT)) | |
107d0d9b RDC |
81 | return -EOPNOTSUPP; |
82 | ||
83 | if (msg->msg_name == NULL) | |
84 | return -EDESTADDRREQ; | |
85 | ||
86 | if (msg->msg_namelen < sizeof(struct sockaddr_pn)) | |
87 | return -EINVAL; | |
88 | ||
89 | target = (struct sockaddr_pn *)msg->msg_name; | |
90 | if (target->spn_family != AF_PHONET) | |
91 | return -EAFNOSUPPORT; | |
92 | ||
93 | skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len, | |
94 | msg->msg_flags & MSG_DONTWAIT, &err); | |
95 | if (skb == NULL) | |
96 | return err; | |
97 | skb_reserve(skb, MAX_PHONET_HEADER); | |
98 | ||
99 | err = memcpy_fromiovec((void *)skb_put(skb, len), msg->msg_iov, len); | |
100 | if (err < 0) { | |
101 | kfree_skb(skb); | |
102 | return err; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Fill in the Phonet header and | |
107 | * finally pass the packet forwards. | |
108 | */ | |
109 | err = pn_skb_send(sk, skb, target); | |
110 | ||
111 | /* If ok, return len. */ | |
112 | return (err >= 0) ? len : err; | |
113 | } | |
114 | ||
115 | static int pn_recvmsg(struct kiocb *iocb, struct sock *sk, | |
116 | struct msghdr *msg, size_t len, int noblock, | |
117 | int flags, int *addr_len) | |
118 | { | |
119 | struct sk_buff *skb = NULL; | |
120 | struct sockaddr_pn sa; | |
121 | int rval = -EOPNOTSUPP; | |
122 | int copylen; | |
123 | ||
82ecbcb9 RDC |
124 | if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL| |
125 | MSG_CMSG_COMPAT)) | |
107d0d9b RDC |
126 | goto out_nofree; |
127 | ||
128 | if (addr_len) | |
129 | *addr_len = sizeof(sa); | |
130 | ||
131 | skb = skb_recv_datagram(sk, flags, noblock, &rval); | |
132 | if (skb == NULL) | |
133 | goto out_nofree; | |
134 | ||
135 | pn_skb_get_src_sockaddr(skb, &sa); | |
136 | ||
137 | copylen = skb->len; | |
138 | if (len < copylen) { | |
139 | msg->msg_flags |= MSG_TRUNC; | |
140 | copylen = len; | |
141 | } | |
142 | ||
143 | rval = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copylen); | |
144 | if (rval) { | |
145 | rval = -EFAULT; | |
146 | goto out; | |
147 | } | |
148 | ||
149 | rval = (flags & MSG_TRUNC) ? skb->len : copylen; | |
150 | ||
151 | if (msg->msg_name != NULL) | |
152 | memcpy(msg->msg_name, &sa, sizeof(struct sockaddr_pn)); | |
153 | ||
154 | out: | |
155 | skb_free_datagram(sk, skb); | |
156 | ||
157 | out_nofree: | |
158 | return rval; | |
159 | } | |
160 | ||
161 | /* Queue an skb for a sock. */ | |
162 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb) | |
163 | { | |
164 | int err = sock_queue_rcv_skb(sk, skb); | |
766e9037 ED |
165 | |
166 | if (err < 0) | |
107d0d9b RDC |
167 | kfree_skb(skb); |
168 | return err ? NET_RX_DROP : NET_RX_SUCCESS; | |
169 | } | |
170 | ||
171 | /* Module registration */ | |
172 | static struct proto pn_proto = { | |
173 | .close = pn_sock_close, | |
174 | .ioctl = pn_ioctl, | |
175 | .init = pn_init, | |
176 | .sendmsg = pn_sendmsg, | |
177 | .recvmsg = pn_recvmsg, | |
178 | .backlog_rcv = pn_backlog_rcv, | |
179 | .hash = pn_sock_hash, | |
180 | .unhash = pn_sock_unhash, | |
181 | .get_port = pn_sock_get_port, | |
182 | .obj_size = sizeof(struct pn_sock), | |
183 | .owner = THIS_MODULE, | |
184 | .name = "PHONET", | |
185 | }; | |
186 | ||
187 | static struct phonet_protocol pn_dgram_proto = { | |
188 | .ops = &phonet_dgram_ops, | |
189 | .prot = &pn_proto, | |
190 | .sock_type = SOCK_DGRAM, | |
191 | }; | |
192 | ||
193 | int __init isi_register(void) | |
194 | { | |
195 | return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto); | |
196 | } | |
197 | ||
198 | void __exit isi_unregister(void) | |
199 | { | |
200 | phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto); | |
201 | } |