Commit | Line | Data |
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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
107d0d9b RDC |
2 | /* |
3 | * File: datagram.c | |
4 | * | |
5 | * Datagram (ISI) Phonet sockets | |
6 | * | |
7 | * Copyright (C) 2008 Nokia Corporation. | |
8 | * | |
31fdc555 RDC |
9 | * Authors: Sakari Ailus <sakari.ailus@nokia.com> |
10 | * Rémi Denis-Courmont | |
107d0d9b RDC |
11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
107d0d9b RDC |
15 | #include <linux/socket.h> |
16 | #include <asm/ioctls.h> | |
17 | #include <net/sock.h> | |
18 | ||
19 | #include <linux/phonet.h> | |
bc3b2d7f | 20 | #include <linux/export.h> |
107d0d9b RDC |
21 | #include <net/phonet/phonet.h> |
22 | ||
23 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
24 | ||
25 | /* associated socket ceases to exist */ | |
26 | static void pn_sock_close(struct sock *sk, long timeout) | |
27 | { | |
28 | sk_common_release(sk); | |
29 | } | |
30 | ||
31 | static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
32 | { | |
33 | struct sk_buff *skb; | |
34 | int answ; | |
35 | ||
36 | switch (cmd) { | |
37 | case SIOCINQ: | |
38 | lock_sock(sk); | |
39 | skb = skb_peek(&sk->sk_receive_queue); | |
40 | answ = skb ? skb->len : 0; | |
41 | release_sock(sk); | |
42 | return put_user(answ, (int __user *)arg); | |
7417fa83 RDC |
43 | |
44 | case SIOCPNADDRESOURCE: | |
45 | case SIOCPNDELRESOURCE: { | |
46 | u32 res; | |
47 | if (get_user(res, (u32 __user *)arg)) | |
48 | return -EFAULT; | |
49 | if (res >= 256) | |
50 | return -EINVAL; | |
51 | if (cmd == SIOCPNADDRESOURCE) | |
52 | return pn_sock_bind_res(sk, res); | |
53 | else | |
54 | return pn_sock_unbind_res(sk, res); | |
55 | } | |
107d0d9b RDC |
56 | } |
57 | ||
58 | return -ENOIOCTLCMD; | |
59 | } | |
60 | ||
61 | /* Destroy socket. All references are gone. */ | |
62 | static void pn_destruct(struct sock *sk) | |
63 | { | |
64 | skb_queue_purge(&sk->sk_receive_queue); | |
65 | } | |
66 | ||
67 | static int pn_init(struct sock *sk) | |
68 | { | |
69 | sk->sk_destruct = pn_destruct; | |
70 | return 0; | |
71 | } | |
72 | ||
1b784140 | 73 | static int pn_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
107d0d9b | 74 | { |
342dfc30 | 75 | DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name); |
107d0d9b RDC |
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 | ||
342dfc30 | 83 | if (target == NULL) |
107d0d9b RDC |
84 | return -EDESTADDRREQ; |
85 | ||
86 | if (msg->msg_namelen < sizeof(struct sockaddr_pn)) | |
87 | return -EINVAL; | |
88 | ||
107d0d9b RDC |
89 | if (target->spn_family != AF_PHONET) |
90 | return -EAFNOSUPPORT; | |
91 | ||
92 | skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len, | |
93 | msg->msg_flags & MSG_DONTWAIT, &err); | |
94 | if (skb == NULL) | |
95 | return err; | |
96 | skb_reserve(skb, MAX_PHONET_HEADER); | |
97 | ||
6ce8e9ce | 98 | err = memcpy_from_msg((void *)skb_put(skb, len), msg, len); |
107d0d9b RDC |
99 | if (err < 0) { |
100 | kfree_skb(skb); | |
101 | return err; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Fill in the Phonet header and | |
106 | * finally pass the packet forwards. | |
107 | */ | |
108 | err = pn_skb_send(sk, skb, target); | |
109 | ||
110 | /* If ok, return len. */ | |
111 | return (err >= 0) ? len : err; | |
112 | } | |
113 | ||
1b784140 YX |
114 | static int pn_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
115 | int noblock, int flags, int *addr_len) | |
107d0d9b RDC |
116 | { |
117 | struct sk_buff *skb = NULL; | |
118 | struct sockaddr_pn sa; | |
119 | int rval = -EOPNOTSUPP; | |
120 | int copylen; | |
121 | ||
82ecbcb9 RDC |
122 | if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL| |
123 | MSG_CMSG_COMPAT)) | |
107d0d9b RDC |
124 | goto out_nofree; |
125 | ||
107d0d9b RDC |
126 | skb = skb_recv_datagram(sk, flags, noblock, &rval); |
127 | if (skb == NULL) | |
128 | goto out_nofree; | |
129 | ||
130 | pn_skb_get_src_sockaddr(skb, &sa); | |
131 | ||
132 | copylen = skb->len; | |
133 | if (len < copylen) { | |
134 | msg->msg_flags |= MSG_TRUNC; | |
135 | copylen = len; | |
136 | } | |
137 | ||
51f3d02b | 138 | rval = skb_copy_datagram_msg(skb, 0, msg, copylen); |
107d0d9b RDC |
139 | if (rval) { |
140 | rval = -EFAULT; | |
141 | goto out; | |
142 | } | |
143 | ||
144 | rval = (flags & MSG_TRUNC) ? skb->len : copylen; | |
145 | ||
bceaa902 | 146 | if (msg->msg_name != NULL) { |
342dfc30 | 147 | __sockaddr_check_size(sizeof(sa)); |
bceaa902 HFS |
148 | memcpy(msg->msg_name, &sa, sizeof(sa)); |
149 | *addr_len = sizeof(sa); | |
150 | } | |
107d0d9b RDC |
151 | |
152 | out: | |
153 | skb_free_datagram(sk, skb); | |
154 | ||
155 | out_nofree: | |
156 | return rval; | |
157 | } | |
158 | ||
159 | /* Queue an skb for a sock. */ | |
160 | static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb) | |
161 | { | |
162 | int err = sock_queue_rcv_skb(sk, skb); | |
766e9037 ED |
163 | |
164 | if (err < 0) | |
107d0d9b RDC |
165 | kfree_skb(skb); |
166 | return err ? NET_RX_DROP : NET_RX_SUCCESS; | |
167 | } | |
168 | ||
169 | /* Module registration */ | |
170 | static struct proto pn_proto = { | |
171 | .close = pn_sock_close, | |
172 | .ioctl = pn_ioctl, | |
173 | .init = pn_init, | |
174 | .sendmsg = pn_sendmsg, | |
175 | .recvmsg = pn_recvmsg, | |
176 | .backlog_rcv = pn_backlog_rcv, | |
177 | .hash = pn_sock_hash, | |
178 | .unhash = pn_sock_unhash, | |
179 | .get_port = pn_sock_get_port, | |
180 | .obj_size = sizeof(struct pn_sock), | |
181 | .owner = THIS_MODULE, | |
182 | .name = "PHONET", | |
183 | }; | |
184 | ||
548ec114 | 185 | static const struct phonet_protocol pn_dgram_proto = { |
107d0d9b RDC |
186 | .ops = &phonet_dgram_ops, |
187 | .prot = &pn_proto, | |
188 | .sock_type = SOCK_DGRAM, | |
189 | }; | |
190 | ||
191 | int __init isi_register(void) | |
192 | { | |
193 | return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto); | |
194 | } | |
195 | ||
196 | void __exit isi_unregister(void) | |
197 | { | |
198 | phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto); | |
199 | } |