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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
199 lines
4.1 KiB
C
199 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* File: datagram.c
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*
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* Datagram (ISI) Phonet sockets
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Authors: Sakari Ailus <sakari.ailus@nokia.com>
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* Rémi Denis-Courmont
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <asm/ioctls.h>
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#include <net/sock.h>
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#include <linux/phonet.h>
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#include <linux/export.h>
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#include <net/phonet/phonet.h>
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static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb);
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/* associated socket ceases to exist */
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static void pn_sock_close(struct sock *sk, long timeout)
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{
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sk_common_release(sk);
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}
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static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg)
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{
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struct sk_buff *skb;
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int answ;
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switch (cmd) {
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case SIOCINQ:
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lock_sock(sk);
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skb = skb_peek(&sk->sk_receive_queue);
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answ = skb ? skb->len : 0;
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release_sock(sk);
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return put_user(answ, (int __user *)arg);
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case SIOCPNADDRESOURCE:
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case SIOCPNDELRESOURCE: {
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u32 res;
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if (get_user(res, (u32 __user *)arg))
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return -EFAULT;
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if (res >= 256)
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return -EINVAL;
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if (cmd == SIOCPNADDRESOURCE)
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return pn_sock_bind_res(sk, res);
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else
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return pn_sock_unbind_res(sk, res);
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}
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}
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return -ENOIOCTLCMD;
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}
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/* Destroy socket. All references are gone. */
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static void pn_destruct(struct sock *sk)
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{
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skb_queue_purge(&sk->sk_receive_queue);
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}
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static int pn_init(struct sock *sk)
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{
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sk->sk_destruct = pn_destruct;
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return 0;
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}
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static int pn_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
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{
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DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name);
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struct sk_buff *skb;
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int err;
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if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
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MSG_CMSG_COMPAT))
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return -EOPNOTSUPP;
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if (target == NULL)
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return -EDESTADDRREQ;
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if (msg->msg_namelen < sizeof(struct sockaddr_pn))
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return -EINVAL;
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if (target->spn_family != AF_PHONET)
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return -EAFNOSUPPORT;
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skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len,
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msg->msg_flags & MSG_DONTWAIT, &err);
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if (skb == NULL)
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return err;
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skb_reserve(skb, MAX_PHONET_HEADER);
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err = memcpy_from_msg((void *)skb_put(skb, len), msg, len);
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if (err < 0) {
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kfree_skb(skb);
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return err;
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}
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/*
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* Fill in the Phonet header and
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* finally pass the packet forwards.
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*/
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err = pn_skb_send(sk, skb, target);
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/* If ok, return len. */
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return (err >= 0) ? len : err;
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}
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static int pn_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
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int noblock, int flags, int *addr_len)
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{
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struct sk_buff *skb = NULL;
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struct sockaddr_pn sa;
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int rval = -EOPNOTSUPP;
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int copylen;
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if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL|
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MSG_CMSG_COMPAT))
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goto out_nofree;
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skb = skb_recv_datagram(sk, flags, noblock, &rval);
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if (skb == NULL)
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goto out_nofree;
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pn_skb_get_src_sockaddr(skb, &sa);
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copylen = skb->len;
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if (len < copylen) {
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msg->msg_flags |= MSG_TRUNC;
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copylen = len;
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}
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rval = skb_copy_datagram_msg(skb, 0, msg, copylen);
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if (rval) {
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rval = -EFAULT;
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goto out;
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}
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rval = (flags & MSG_TRUNC) ? skb->len : copylen;
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if (msg->msg_name != NULL) {
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__sockaddr_check_size(sizeof(sa));
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memcpy(msg->msg_name, &sa, sizeof(sa));
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*addr_len = sizeof(sa);
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}
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out:
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skb_free_datagram(sk, skb);
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out_nofree:
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return rval;
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}
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/* Queue an skb for a sock. */
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static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb)
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{
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int err = sock_queue_rcv_skb(sk, skb);
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if (err < 0)
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kfree_skb(skb);
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return err ? NET_RX_DROP : NET_RX_SUCCESS;
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}
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/* Module registration */
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static struct proto pn_proto = {
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.close = pn_sock_close,
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.ioctl = pn_ioctl,
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.init = pn_init,
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.sendmsg = pn_sendmsg,
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.recvmsg = pn_recvmsg,
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.backlog_rcv = pn_backlog_rcv,
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.hash = pn_sock_hash,
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.unhash = pn_sock_unhash,
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.get_port = pn_sock_get_port,
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.obj_size = sizeof(struct pn_sock),
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.owner = THIS_MODULE,
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.name = "PHONET",
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};
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static const struct phonet_protocol pn_dgram_proto = {
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.ops = &phonet_dgram_ops,
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.prot = &pn_proto,
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.sock_type = SOCK_DGRAM,
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};
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int __init isi_register(void)
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{
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return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto);
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}
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void __exit isi_unregister(void)
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{
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phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto);
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}
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