Phonet: Phonet datagram transport protocol (107d0d9b) · Commits · 戴 / test

include/net/phonet/phonet.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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

net/phonet/Makefile

+1 −0

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

net/phonet/af_phonet.c

+106 −0

Original line number	Diff line number	Diff line
		@@ -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();

net/phonet/datagram.c

0 → 100644

+197 −0

Original line number	Diff line number	Diff line
		/*
		* 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);
		}

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