Phonet: Phonet datagram transport protocol

This provides the basic SOCK_DGRAM transport protocol for Phonet.

Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Remi Denis-Courmont 2008-09-22 20:05:57 -07:00 коммит произвёл David S. Miller
Родитель ba113a94b7
Коммит 107d0d9b8d
4 изменённых файлов: 310 добавлений и 0 удалений

Просмотреть файл

@ -51,6 +51,9 @@ void pn_sock_hash(struct sock *sk);
void pn_sock_unhash(struct sock *sk);
int pn_sock_get_port(struct sock *sk, unsigned short sport);
int pn_skb_send(struct sock *sk, struct sk_buff *skb,
const struct sockaddr_pn *target);
static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
{
return (struct phonethdr *)skb_network_header(skb);
@ -95,4 +98,7 @@ int phonet_proto_register(int protocol, struct phonet_protocol *pp);
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
void phonet_netlink_register(void);
int isi_register(void);
void isi_unregister(void);
#endif

Просмотреть файл

@ -4,4 +4,5 @@ phonet-objs := \
pn_dev.o \
pn_netlink.o \
socket.o \
datagram.o \
af_phonet.o

Просмотреть файл

@ -99,6 +99,101 @@ static struct net_proto_family phonet_proto_family = {
.owner = THIS_MODULE,
};
/*
* Prepends an ISI header and sends a datagram.
*/
static int pn_send(struct sk_buff *skb, struct net_device *dev,
u16 dst, u16 src, u8 res)
{
struct phonethdr *ph;
int err;
if (skb->len + 2 > 0xffff) {
/* Phonet length field would overflow */
err = -EMSGSIZE;
goto drop;
}
skb_reset_transport_header(skb);
WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
skb_push(skb, sizeof(struct phonethdr));
skb_reset_network_header(skb);
ph = pn_hdr(skb);
ph->pn_rdev = pn_dev(dst);
ph->pn_sdev = pn_dev(src);
ph->pn_res = res;
ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph));
ph->pn_robj = pn_obj(dst);
ph->pn_sobj = pn_obj(src);
skb->protocol = htons(ETH_P_PHONET);
skb->priority = 0;
skb->dev = dev;
if (pn_addr(src) == pn_addr(dst)) {
skb_reset_mac_header(skb);
skb->pkt_type = PACKET_LOOPBACK;
skb_orphan(skb);
netif_rx_ni(skb);
err = 0;
} else {
err = dev_hard_header(skb, dev, ntohs(skb->protocol),
NULL, NULL, skb->len);
if (err < 0) {
err = -EHOSTUNREACH;
goto drop;
}
err = dev_queue_xmit(skb);
}
return err;
drop:
kfree_skb(skb);
return err;
}
/*
* Create a Phonet header for the skb and send it out. Returns
* non-zero error code if failed. The skb is freed then.
*/
int pn_skb_send(struct sock *sk, struct sk_buff *skb,
const struct sockaddr_pn *target)
{
struct net_device *dev;
struct pn_sock *pn = pn_sk(sk);
int err;
u16 src;
u8 daddr = pn_sockaddr_get_addr(target), saddr = PN_NO_ADDR;
err = -EHOSTUNREACH;
if (sk->sk_bound_dev_if)
dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
else
dev = phonet_device_get(sock_net(sk));
if (!dev || !(dev->flags & IFF_UP))
goto drop;
saddr = phonet_address_get(dev, daddr);
if (saddr == PN_NO_ADDR)
goto drop;
src = pn->sobject;
if (!pn_addr(src))
src = pn_object(saddr, pn_obj(src));
err = pn_send(skb, dev, pn_sockaddr_get_object(target),
src, pn_sockaddr_get_resource(target));
dev_put(dev);
return err;
drop:
kfree_skb(skb);
if (dev)
dev_put(dev);
return err;
}
EXPORT_SYMBOL(pn_skb_send);
/* packet type functions */
/*
@ -226,11 +321,22 @@ static int __init phonet_init(void)
phonet_device_init();
dev_add_pack(&phonet_packet_type);
phonet_netlink_register();
err = isi_register();
if (err)
goto err;
return 0;
err:
sock_unregister(AF_PHONET);
dev_remove_pack(&phonet_packet_type);
phonet_device_exit();
return err;
}
static void __exit phonet_exit(void)
{
isi_unregister();
sock_unregister(AF_PHONET);
dev_remove_pack(&phonet_packet_type);
phonet_device_exit();

197
net/phonet/datagram.c Normal file
Просмотреть файл

@ -0,0 +1,197 @@
/*
* File: datagram.c
*
* Datagram (ISI) Phonet sockets
*
* Copyright (C) 2008 Nokia Corporation.
*
* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
* Original author: Sakari Ailus <sakari.ailus@nokia.com>
*
* 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
*/
#include <linux/kernel.h>
#include <linux/socket.h>
#include <asm/ioctls.h>
#include <net/sock.h>
#include <linux/phonet.h>
#include <net/phonet/phonet.h>
static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb);
/* associated socket ceases to exist */
static void pn_sock_close(struct sock *sk, long timeout)
{
sk_common_release(sk);
}
static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
struct sk_buff *skb;
int answ;
switch (cmd) {
case SIOCINQ:
lock_sock(sk);
skb = skb_peek(&sk->sk_receive_queue);
answ = skb ? skb->len : 0;
release_sock(sk);
return put_user(answ, (int __user *)arg);
}
return -ENOIOCTLCMD;
}
/* Destroy socket. All references are gone. */
static void pn_destruct(struct sock *sk)
{
skb_queue_purge(&sk->sk_receive_queue);
}
static int pn_init(struct sock *sk)
{
sk->sk_destruct = pn_destruct;
return 0;
}
static int pn_sendmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len)
{
struct sockaddr_pn *target;
struct sk_buff *skb;
int err;
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
if (msg->msg_name == NULL)
return -EDESTADDRREQ;
if (msg->msg_namelen < sizeof(struct sockaddr_pn))
return -EINVAL;
target = (struct sockaddr_pn *)msg->msg_name;
if (target->spn_family != AF_PHONET)
return -EAFNOSUPPORT;
skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len,
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
return err;
skb_reserve(skb, MAX_PHONET_HEADER);
err = memcpy_fromiovec((void *)skb_put(skb, len), msg->msg_iov, len);
if (err < 0) {
kfree_skb(skb);
return err;
}
/*
* Fill in the Phonet header and
* finally pass the packet forwards.
*/
err = pn_skb_send(sk, skb, target);
/* If ok, return len. */
return (err >= 0) ? len : err;
}
static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len, int noblock,
int flags, int *addr_len)
{
struct sk_buff *skb = NULL;
struct sockaddr_pn sa;
int rval = -EOPNOTSUPP;
int copylen;
if (flags & MSG_OOB)
goto out_nofree;
if (addr_len)
*addr_len = sizeof(sa);
skb = skb_recv_datagram(sk, flags, noblock, &rval);
if (skb == NULL)
goto out_nofree;
pn_skb_get_src_sockaddr(skb, &sa);
copylen = skb->len;
if (len < copylen) {
msg->msg_flags |= MSG_TRUNC;
copylen = len;
}
rval = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copylen);
if (rval) {
rval = -EFAULT;
goto out;
}
rval = (flags & MSG_TRUNC) ? skb->len : copylen;
if (msg->msg_name != NULL)
memcpy(msg->msg_name, &sa, sizeof(struct sockaddr_pn));
out:
skb_free_datagram(sk, skb);
out_nofree:
return rval;
}
/* Queue an skb for a sock. */
static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
int err = sock_queue_rcv_skb(sk, skb);
if (err < 0)
kfree_skb(skb);
return err ? NET_RX_DROP : NET_RX_SUCCESS;
}
/* Module registration */
static struct proto pn_proto = {
.close = pn_sock_close,
.ioctl = pn_ioctl,
.init = pn_init,
.sendmsg = pn_sendmsg,
.recvmsg = pn_recvmsg,
.backlog_rcv = pn_backlog_rcv,
.hash = pn_sock_hash,
.unhash = pn_sock_unhash,
.get_port = pn_sock_get_port,
.obj_size = sizeof(struct pn_sock),
.owner = THIS_MODULE,
.name = "PHONET",
};
static struct phonet_protocol pn_dgram_proto = {
.ops = &phonet_dgram_ops,
.prot = &pn_proto,
.sock_type = SOCK_DGRAM,
};
int __init isi_register(void)
{
return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto);
}
void __exit isi_unregister(void)
{
phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto);
}