af_decnet.c 53.5 KB
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/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Socket Layer Interface
 *
 * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
 *              Patrick Caulfield <patrick@pandh.demon.co.uk>
 *
 * Changes:
 *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
 *                          version of the code. Original copyright preserved
 *                          below.
 *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
 *                          compatible with my routing layer.
 *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
 *                          Caulfield.
 *        Steve Whitehouse: Further bug fixes, checking module code still works
 *                          with new routing layer.
 *        Steve Whitehouse: Additional set/get_sockopt() calls.
 *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
 *                          code.
 *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
 *                          way. Didn't manage it entirely, but its better.
 *        Steve Whitehouse: ditto for sendmsg().
 *        Steve Whitehouse: A selection of bug fixes to various things.
 *        Steve Whitehouse: Added TIOCOUTQ ioctl.
 *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
 *        Steve Whitehouse: Fixes to connect() error returns.
 *       Patrick Caulfield: Fixes to delayed acceptance logic.
 *         David S. Miller: New socket locking
 *        Steve Whitehouse: Socket list hashing/locking
 *         Arnaldo C. Melo: use capable, not suser
 *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
 *                          when required.
 *       Patrick Caulfield: /proc/net/decnet now has object name/number
 *        Steve Whitehouse: Fixed local port allocation, hashed sk list
 *          Matthew Wilcox: Fixes for dn_ioctl()
 *        Steve Whitehouse: New connect/accept logic to allow timeouts and
 *                          prepare for sendpage etc.
 */


/******************************************************************************
    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
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    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    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.

HISTORY:

Version           Kernel     Date       Author/Comments
-------           ------     ----       ---------------
Version 0.0.1     2.0.30    01-dic-97	Eduardo Marcelo Serrat
					(emserrat@geocities.com)

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					First Development of DECnet Socket La-
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					yer for Linux. Only supports outgoing
					connections.

Version 0.0.2	  2.1.105   20-jun-98   Patrick J. Caulfield
					(patrick@pandh.demon.co.uk)

					Port to new kernel development version.

Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
					(emserrat@geocities.com)
					_
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					Added support for incoming connections
					so we can start developing server apps
					on Linux.
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					-
					Module Support
Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
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				       (emserrat@geocities.com)
				       _
					Added support for X11R6.4. Now we can
					use DECnet transport for X on Linux!!!
				       -
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Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
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				       (emserrat@geocities.com)
				       Removed bugs on flow control
				       Removed bugs on incoming accessdata
				       order
				       -
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Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
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				       dn_recvmsg fixes
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					Patrick J. Caulfield
				       dn_bind fixes
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*******************************************************************************/

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/inet.h>
#include <linux/route.h>
#include <linux/netfilter.h>
#include <linux/seq_file.h>
#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <net/flow.h>
#include <asm/ioctls.h>
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#include <linux/capability.h>
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#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/poll.h>
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#include <net/net_namespace.h>
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#include <net/neighbour.h>
#include <net/dst.h>
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#include <net/fib_rules.h>
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#include <net/dn.h>
#include <net/dn_nsp.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>
#include <net/dn_fib.h>
#include <net/dn_neigh.h>

struct dn_sock {
	struct sock sk;
	struct dn_scp scp;
};

static void dn_keepalive(struct sock *sk);

#define DN_SK_HASH_SHIFT 8
#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)


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static const struct proto_ops dn_proto_ops;
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static DEFINE_RWLOCK(dn_hash_lock);
static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
static struct hlist_head dn_wild_sk;
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static atomic_long_t decnet_memory_allocated;
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static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
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static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);

static struct hlist_head *dn_find_list(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	if (scp->addr.sdn_flags & SDF_WILD)
		return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;

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	return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
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}

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/*
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 * Valid ports are those greater than zero and not already in use.
 */
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static int check_port(__le16 port)
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{
	struct sock *sk;
	struct hlist_node *node;

	if (port == 0)
		return -1;

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	sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
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		struct dn_scp *scp = DN_SK(sk);
		if (scp->addrloc == port)
			return -1;
	}
	return 0;
}

static unsigned short port_alloc(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);
static unsigned short port = 0x2000;
	unsigned short i_port = port;

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	while(check_port(cpu_to_le16(++port)) != 0) {
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		if (port == i_port)
			return 0;
	}

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	scp->addrloc = cpu_to_le16(port);
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	return 1;
}

/*
 * Since this is only ever called from user
 * level, we don't need a write_lock() version
 * of this.
 */
static int dn_hash_sock(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);
	struct hlist_head *list;
	int rv = -EUSERS;

	BUG_ON(sk_hashed(sk));

	write_lock_bh(&dn_hash_lock);
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	if (!scp->addrloc && !port_alloc(sk))
		goto out;

	rv = -EADDRINUSE;
	if ((list = dn_find_list(sk)) == NULL)
		goto out;

	sk_add_node(sk, list);
	rv = 0;
out:
	write_unlock_bh(&dn_hash_lock);
	return rv;
}

static void dn_unhash_sock(struct sock *sk)
{
	write_lock(&dn_hash_lock);
	sk_del_node_init(sk);
	write_unlock(&dn_hash_lock);
}

static void dn_unhash_sock_bh(struct sock *sk)
{
	write_lock_bh(&dn_hash_lock);
	sk_del_node_init(sk);
	write_unlock_bh(&dn_hash_lock);
}

static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
{
	int i;
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	unsigned int hash = addr->sdn_objnum;
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	if (hash == 0) {
		hash = addr->sdn_objnamel;
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		for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
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			hash ^= addr->sdn_objname[i];
			hash ^= (hash << 3);
		}
	}

	return &dn_sk_hash[hash & DN_SK_HASH_MASK];
}

/*
 * Called to transform a socket from bound (i.e. with a local address)
 * into a listening socket (doesn't need a local port number) and rehashes
 * based upon the object name/number.
 */
static void dn_rehash_sock(struct sock *sk)
{
	struct hlist_head *list;
	struct dn_scp *scp = DN_SK(sk);

	if (scp->addr.sdn_flags & SDF_WILD)
		return;

	write_lock_bh(&dn_hash_lock);
	sk_del_node_init(sk);
	DN_SK(sk)->addrloc = 0;
	list = listen_hash(&DN_SK(sk)->addr);
	sk_add_node(sk, list);
	write_unlock_bh(&dn_hash_lock);
}

int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
{
	int len = 2;

	*buf++ = type;

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	switch (type) {
	case 0:
		*buf++ = sdn->sdn_objnum;
		break;
	case 1:
		*buf++ = 0;
		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
		len = 3 + le16_to_cpu(sdn->sdn_objnamel);
		break;
	case 2:
		memset(buf, 0, 5);
		buf += 5;
		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
		len = 7 + le16_to_cpu(sdn->sdn_objnamel);
		break;
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	}

	return len;
}

/*
 * On reception of usernames, we handle types 1 and 0 for destination
 * addresses only. Types 2 and 4 are used for source addresses, but the
 * UIC, GIC are ignored and they are both treated the same way. Type 3
 * is never used as I've no idea what its purpose might be or what its
 * format is.
 */
int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
{
	unsigned char type;
	int size = len;
	int namel = 12;

	sdn->sdn_objnum = 0;
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	sdn->sdn_objnamel = cpu_to_le16(0);
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	memset(sdn->sdn_objname, 0, DN_MAXOBJL);

	if (len < 2)
		return -1;

	len -= 2;
	*fmt = *data++;
	type = *data++;

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	switch (*fmt) {
	case 0:
		sdn->sdn_objnum = type;
		return 2;
	case 1:
		namel = 16;
		break;
	case 2:
		len  -= 4;
		data += 4;
		break;
	case 4:
		len  -= 8;
		data += 8;
		break;
	default:
		return -1;
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	}

	len -= 1;

	if (len < 0)
		return -1;

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	sdn->sdn_objnamel = cpu_to_le16(*data++);
	len -= le16_to_cpu(sdn->sdn_objnamel);
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	if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
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		return -1;

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	memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
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	return size - len;
}

struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
{
	struct hlist_head *list = listen_hash(addr);
	struct hlist_node *node;
	struct sock *sk;

	read_lock(&dn_hash_lock);
	sk_for_each(sk, node, list) {
		struct dn_scp *scp = DN_SK(sk);
		if (sk->sk_state != TCP_LISTEN)
			continue;
		if (scp->addr.sdn_objnum) {
			if (scp->addr.sdn_objnum != addr->sdn_objnum)
				continue;
		} else {
			if (addr->sdn_objnum)
				continue;
			if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
				continue;
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			if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
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				continue;
		}
		sock_hold(sk);
		read_unlock(&dn_hash_lock);
		return sk;
	}

	sk = sk_head(&dn_wild_sk);
	if (sk) {
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		if (sk->sk_state == TCP_LISTEN)
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			sock_hold(sk);
		else
			sk = NULL;
	}

	read_unlock(&dn_hash_lock);
	return sk;
}

struct sock *dn_find_by_skb(struct sk_buff *skb)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct sock *sk;
	struct hlist_node *node;
	struct dn_scp *scp;

	read_lock(&dn_hash_lock);
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	sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
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		scp = DN_SK(sk);
		if (cb->src != dn_saddr2dn(&scp->peer))
			continue;
		if (cb->dst_port != scp->addrloc)
			continue;
		if (scp->addrrem && (cb->src_port != scp->addrrem))
			continue;
		sock_hold(sk);
		goto found;
	}
	sk = NULL;
found:
	read_unlock(&dn_hash_lock);
	return sk;
}



static void dn_destruct(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	skb_queue_purge(&scp->data_xmit_queue);
	skb_queue_purge(&scp->other_xmit_queue);
	skb_queue_purge(&scp->other_receive_queue);

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	dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
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}

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static int dn_memory_pressure;

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static void dn_enter_memory_pressure(struct sock *sk)
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{
	if (!dn_memory_pressure) {
		dn_memory_pressure = 1;
	}
}

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static struct proto dn_proto = {
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	.name			= "NSP",
	.owner			= THIS_MODULE,
	.enter_memory_pressure	= dn_enter_memory_pressure,
	.memory_pressure	= &dn_memory_pressure,
	.memory_allocated	= &decnet_memory_allocated,
	.sysctl_mem		= sysctl_decnet_mem,
	.sysctl_wmem		= sysctl_decnet_wmem,
	.sysctl_rmem		= sysctl_decnet_rmem,
	.max_header		= DN_MAX_NSP_DATA_HEADER + 64,
	.obj_size		= sizeof(struct dn_sock),
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};

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static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
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{
	struct dn_scp *scp;
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	struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
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	if  (!sk)
		goto out;

	if (sock)
		sock->ops = &dn_proto_ops;
	sock_init_data(sock, sk);

	sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
	sk->sk_destruct    = dn_destruct;
	sk->sk_no_check    = 1;
	sk->sk_family      = PF_DECnet;
	sk->sk_protocol    = 0;
	sk->sk_allocation  = gfp;
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	sk->sk_sndbuf	   = sysctl_decnet_wmem[1];
	sk->sk_rcvbuf	   = sysctl_decnet_rmem[1];
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	/* Initialization of DECnet Session Control Port		*/
	scp = DN_SK(sk);
	scp->state	= DN_O;		/* Open			*/
	scp->numdat	= 1;		/* Next data seg to tx	*/
	scp->numoth	= 1;		/* Next oth data to tx  */
	scp->ackxmt_dat = 0;		/* Last data seg ack'ed */
	scp->ackxmt_oth = 0;		/* Last oth data ack'ed */
	scp->ackrcv_dat = 0;		/* Highest data ack recv*/
	scp->ackrcv_oth = 0;		/* Last oth data ack rec*/
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	scp->flowrem_sw = DN_SEND;
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	scp->flowloc_sw = DN_SEND;
	scp->flowrem_dat = 0;
	scp->flowrem_oth = 1;
	scp->flowloc_dat = 0;
	scp->flowloc_oth = 1;
	scp->services_rem = 0;
	scp->services_loc = 1 | NSP_FC_NONE;
	scp->info_rem = 0;
	scp->info_loc = 0x03; /* NSP version 4.1 */
	scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
	scp->nonagle = 0;
	scp->multi_ireq = 1;
	scp->accept_mode = ACC_IMMED;
	scp->addr.sdn_family    = AF_DECnet;
	scp->peer.sdn_family    = AF_DECnet;
	scp->accessdata.acc_accl = 5;
	memcpy(scp->accessdata.acc_acc, "LINUX", 5);

	scp->max_window   = NSP_MAX_WINDOW;
	scp->snd_window   = NSP_MIN_WINDOW;
	scp->nsp_srtt     = NSP_INITIAL_SRTT;
	scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
	scp->nsp_rxtshift = 0;

	skb_queue_head_init(&scp->data_xmit_queue);
	skb_queue_head_init(&scp->other_xmit_queue);
	skb_queue_head_init(&scp->other_receive_queue);

	scp->persist = 0;
	scp->persist_fxn = NULL;
	scp->keepalive = 10 * HZ;
	scp->keepalive_fxn = dn_keepalive;

	init_timer(&scp->delack_timer);
	scp->delack_pending = 0;
	scp->delack_fxn = dn_nsp_delayed_ack;

	dn_start_slow_timer(sk);
out:
	return sk;
}

/*
 * Keepalive timer.
 * FIXME: Should respond to SO_KEEPALIVE etc.
 */
static void dn_keepalive(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	/*
	 * By checking the other_data transmit queue is empty
	 * we are double checking that we are not sending too
	 * many of these keepalive frames.
	 */
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	if (skb_queue_empty(&scp->other_xmit_queue))
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		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
}


/*
 * Timer for shutdown/destroyed sockets.
 * When socket is dead & no packets have been sent for a
 * certain amount of time, they are removed by this
 * routine. Also takes care of sending out DI & DC
 * frames at correct times.
 */
int dn_destroy_timer(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	scp->persist = dn_nsp_persist(sk);

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	switch (scp->state) {
	case DN_DI:
		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
		if (scp->nsp_rxtshift >= decnet_di_count)
			scp->state = DN_CN;
		return 0;
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	case DN_DR:
		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
		if (scp->nsp_rxtshift >= decnet_dr_count)
			scp->state = DN_DRC;
		return 0;
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	case DN_DN:
		if (scp->nsp_rxtshift < decnet_dn_count) {
			/* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
			dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
					 GFP_ATOMIC);
			return 0;
		}
L
Linus Torvalds 已提交
597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
	}

	scp->persist = (HZ * decnet_time_wait);

	if (sk->sk_socket)
		return 0;

	if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
		dn_unhash_sock(sk);
		sock_put(sk);
		return 1;
	}

	return 0;
}

static void dn_destroy_sock(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	scp->nsp_rxtshift = 0; /* reset back off */

	if (sk->sk_socket) {
		if (sk->sk_socket->state != SS_UNCONNECTED)
			sk->sk_socket->state = SS_DISCONNECTING;
	}

	sk->sk_state = TCP_CLOSE;

J
Joe Perches 已提交
626 627 628 629 630 631 632 633 634 635 636 637 638 639
	switch (scp->state) {
	case DN_DN:
		dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
				 sk->sk_allocation);
		scp->persist_fxn = dn_destroy_timer;
		scp->persist = dn_nsp_persist(sk);
		break;
	case DN_CR:
		scp->state = DN_DR;
		goto disc_reject;
	case DN_RUN:
		scp->state = DN_DI;
	case DN_DI:
	case DN_DR:
L
Linus Torvalds 已提交
640
disc_reject:
J
Joe Perches 已提交
641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656
		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
	case DN_NC:
	case DN_NR:
	case DN_RJ:
	case DN_DIC:
	case DN_CN:
	case DN_DRC:
	case DN_CI:
	case DN_CD:
		scp->persist_fxn = dn_destroy_timer;
		scp->persist = dn_nsp_persist(sk);
		break;
	default:
		printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
	case DN_O:
		dn_stop_slow_timer(sk);
L
Linus Torvalds 已提交
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J
Joe Perches 已提交
658 659
		dn_unhash_sock_bh(sk);
		sock_put(sk);
L
Linus Torvalds 已提交
660

J
Joe Perches 已提交
661
		break;
L
Linus Torvalds 已提交
662 663 664
	}
}

665
char *dn_addr2asc(__u16 addr, char *buf)
L
Linus Torvalds 已提交
666 667 668 669 670 671 672 673 674 675 676 677
{
	unsigned short node, area;

	node = addr & 0x03ff;
	area = addr >> 10;
	sprintf(buf, "%hd.%hd", area, node);

	return buf;
}



678 679
static int dn_create(struct net *net, struct socket *sock, int protocol,
		     int kern)
L
Linus Torvalds 已提交
680 681 682
{
	struct sock *sk;

O
Octavian Purdila 已提交
683
	if (!net_eq(net, &init_net))
684 685
		return -EAFNOSUPPORT;

J
Joe Perches 已提交
686 687 688 689 690 691 692 693 694
	switch (sock->type) {
	case SOCK_SEQPACKET:
		if (protocol != DNPROTO_NSP)
			return -EPROTONOSUPPORT;
		break;
	case SOCK_STREAM:
		break;
	default:
		return -ESOCKTNOSUPPORT;
L
Linus Torvalds 已提交
695 696 697
	}


698
	if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
L
Linus Torvalds 已提交
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
		return -ENOBUFS;

	sk->sk_protocol = protocol;

	return 0;
}


static int
dn_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	if (sk) {
		sock_orphan(sk);
		sock_hold(sk);
		lock_sock(sk);
		dn_destroy_sock(sk);
		release_sock(sk);
		sock_put(sk);
	}

721
	return 0;
L
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722 723 724 725 726 727 728
}

static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
729
	struct net_device *dev, *ldev;
L
Linus Torvalds 已提交
730 731 732 733 734 735 736 737
	int rv;

	if (addr_len != sizeof(struct sockaddr_dn))
		return -EINVAL;

	if (saddr->sdn_family != AF_DECnet)
		return -EINVAL;

738
	if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
L
Linus Torvalds 已提交
739 740
		return -EINVAL;

741
	if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
L
Linus Torvalds 已提交
742 743 744 745 746 747 748 749 750 751
		return -EINVAL;

	if (saddr->sdn_flags & ~SDF_WILD)
		return -EINVAL;

	if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
	    (saddr->sdn_flags & SDF_WILD)))
		return -EACCES;

	if (!(saddr->sdn_flags & SDF_WILD)) {
752
		if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
753
			rcu_read_lock();
754
			ldev = NULL;
755
			for_each_netdev_rcu(&init_net, dev) {
L
Linus Torvalds 已提交
756 757
				if (!dev->dn_ptr)
					continue;
758 759
				if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
					ldev = dev;
L
Linus Torvalds 已提交
760
					break;
761
				}
L
Linus Torvalds 已提交
762
			}
763
			rcu_read_unlock();
764
			if (ldev == NULL)
L
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765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
				return -EADDRNOTAVAIL;
		}
	}

	rv = -EINVAL;
	lock_sock(sk);
	if (sock_flag(sk, SOCK_ZAPPED)) {
		memcpy(&scp->addr, saddr, addr_len);
		sock_reset_flag(sk, SOCK_ZAPPED);

		rv = dn_hash_sock(sk);
		if (rv)
			sock_set_flag(sk, SOCK_ZAPPED);
	}
	release_sock(sk);

781
	return rv;
L
Linus Torvalds 已提交
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
}


static int dn_auto_bind(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	int rv;

	sock_reset_flag(sk, SOCK_ZAPPED);

	scp->addr.sdn_flags  = 0;
	scp->addr.sdn_objnum = 0;

	/*
	 * This stuff is to keep compatibility with Eduardo's
	 * patch. I hope I can dispense with it shortly...
	 */
	if ((scp->accessdata.acc_accl != 0) &&
		(scp->accessdata.acc_accl <= 12)) {
802

803 804
		scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
		memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
L
Linus Torvalds 已提交
805 806 807 808 809 810

		scp->accessdata.acc_accl = 0;
		memset(scp->accessdata.acc_acc, 0, 40);
	}
	/* End of compatibility stuff */

811
	scp->addr.sdn_add.a_len = cpu_to_le16(2);
812
	rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
L
Linus Torvalds 已提交
813 814 815 816 817 818 819 820 821
	if (rv == 0) {
		rv = dn_hash_sock(sk);
		if (rv)
			sock_set_flag(sk, SOCK_ZAPPED);
	}

	return rv;
}

A
Al Viro 已提交
822
static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
L
Linus Torvalds 已提交
823 824 825 826 827 828 829 830 831
{
	struct dn_scp *scp = DN_SK(sk);
	DEFINE_WAIT(wait);
	int err;

	if (scp->state != DN_CR)
		return -EINVAL;

	scp->state = DN_CC;
832
	scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
L
Linus Torvalds 已提交
833 834
	dn_send_conn_conf(sk, allocation);

E
Eric Dumazet 已提交
835
	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852
	for(;;) {
		release_sock(sk);
		if (scp->state == DN_CC)
			*timeo = schedule_timeout(*timeo);
		lock_sock(sk);
		err = 0;
		if (scp->state == DN_RUN)
			break;
		err = sock_error(sk);
		if (err)
			break;
		err = sock_intr_errno(*timeo);
		if (signal_pending(current))
			break;
		err = -EAGAIN;
		if (!*timeo)
			break;
E
Eric Dumazet 已提交
853
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
854
	}
E
Eric Dumazet 已提交
855
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
	if (err == 0) {
		sk->sk_socket->state = SS_CONNECTED;
	} else if (scp->state != DN_CC) {
		sk->sk_socket->state = SS_UNCONNECTED;
	}
	return err;
}

static int dn_wait_run(struct sock *sk, long *timeo)
{
	struct dn_scp *scp = DN_SK(sk);
	DEFINE_WAIT(wait);
	int err = 0;

	if (scp->state == DN_RUN)
		goto out;

	if (!*timeo)
		return -EALREADY;

E
Eric Dumazet 已提交
876
	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
	for(;;) {
		release_sock(sk);
		if (scp->state == DN_CI || scp->state == DN_CC)
			*timeo = schedule_timeout(*timeo);
		lock_sock(sk);
		err = 0;
		if (scp->state == DN_RUN)
			break;
		err = sock_error(sk);
		if (err)
			break;
		err = sock_intr_errno(*timeo);
		if (signal_pending(current))
			break;
		err = -ETIMEDOUT;
		if (!*timeo)
			break;
E
Eric Dumazet 已提交
894
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
895
	}
E
Eric Dumazet 已提交
896
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
897 898 899 900 901 902 903 904 905 906 907 908 909 910
out:
	if (err == 0) {
		sk->sk_socket->state = SS_CONNECTED;
	} else if (scp->state != DN_CI && scp->state != DN_CC) {
		sk->sk_socket->state = SS_UNCONNECTED;
	}
	return err;
}

static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
{
	struct socket *sock = sk->sk_socket;
	struct dn_scp *scp = DN_SK(sk);
	int err = -EISCONN;
911
	struct flowidn fld;
912
	struct dst_entry *dst;
L
Linus Torvalds 已提交
913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950

	if (sock->state == SS_CONNECTED)
		goto out;

	if (sock->state == SS_CONNECTING) {
		err = 0;
		if (scp->state == DN_RUN) {
			sock->state = SS_CONNECTED;
			goto out;
		}
		err = -ECONNREFUSED;
		if (scp->state != DN_CI && scp->state != DN_CC) {
			sock->state = SS_UNCONNECTED;
			goto out;
		}
		return dn_wait_run(sk, timeo);
	}

	err = -EINVAL;
	if (scp->state != DN_O)
		goto out;

	if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
		goto out;
	if (addr->sdn_family != AF_DECnet)
		goto out;
	if (addr->sdn_flags & SDF_WILD)
		goto out;

	if (sock_flag(sk, SOCK_ZAPPED)) {
		err = dn_auto_bind(sk->sk_socket);
		if (err)
			goto out;
	}

	memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));

	err = -EHOSTUNREACH;
951 952 953 954 955 956 957
	memset(&fld, 0, sizeof(fld));
	fld.flowidn_oif = sk->sk_bound_dev_if;
	fld.daddr = dn_saddr2dn(&scp->peer);
	fld.saddr = dn_saddr2dn(&scp->addr);
	dn_sk_ports_copy(&fld, scp);
	fld.flowidn_proto = DNPROTO_NSP;
	if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
L
Linus Torvalds 已提交
958
		goto out;
959 960
	dst = __sk_dst_get(sk);
	sk->sk_route_caps = dst->dev->features;
L
Linus Torvalds 已提交
961 962
	sock->state = SS_CONNECTING;
	scp->state = DN_CI;
963
	scp->segsize_loc = dst_metric_advmss(dst);
L
Linus Torvalds 已提交
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991

	dn_nsp_send_conninit(sk, NSP_CI);
	err = -EINPROGRESS;
	if (*timeo) {
		err = dn_wait_run(sk, timeo);
	}
out:
	return err;
}

static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
{
	struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
	struct sock *sk = sock->sk;
	int err;
	long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);

	lock_sock(sk);
	err = __dn_connect(sk, addr, addrlen, &timeo, 0);
	release_sock(sk);

	return err;
}

static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
{
	struct dn_scp *scp = DN_SK(sk);

J
Joe Perches 已提交
992 993 994 995 996 997 998 999 1000 1001
	switch (scp->state) {
	case DN_RUN:
		return 0;
	case DN_CR:
		return dn_confirm_accept(sk, timeo, sk->sk_allocation);
	case DN_CI:
	case DN_CC:
		return dn_wait_run(sk, timeo);
	case DN_O:
		return __dn_connect(sk, addr, addrlen, timeo, flags);
L
Linus Torvalds 已提交
1002 1003 1004 1005 1006 1007 1008 1009
	}

	return -EINVAL;
}


static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
{
1010
	unsigned char *ptr = skb->data;
L
Linus Torvalds 已提交
1011

1012 1013 1014
	acc->acc_userl = *ptr++;
	memcpy(&acc->acc_user, ptr, acc->acc_userl);
	ptr += acc->acc_userl;
L
Linus Torvalds 已提交
1015

1016 1017 1018
	acc->acc_passl = *ptr++;
	memcpy(&acc->acc_pass, ptr, acc->acc_passl);
	ptr += acc->acc_passl;
L
Linus Torvalds 已提交
1019

1020 1021
	acc->acc_accl = *ptr++;
	memcpy(&acc->acc_acc, ptr, acc->acc_accl);
L
Linus Torvalds 已提交
1022

1023
	skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
L
Linus Torvalds 已提交
1024 1025 1026 1027 1028

}

static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
{
1029 1030 1031 1032
	unsigned char *ptr = skb->data;
	u16 len = *ptr++; /* yes, it's 8bit on the wire */

	BUG_ON(len > 16); /* we've checked the contents earlier */
1033
	opt->opt_optl   = cpu_to_le16(len);
1034 1035 1036
	opt->opt_status = 0;
	memcpy(opt->opt_data, ptr, len);
	skb_pull(skb, len + 1);
L
Linus Torvalds 已提交
1037 1038 1039 1040 1041 1042 1043 1044
}

static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
{
	DEFINE_WAIT(wait);
	struct sk_buff *skb = NULL;
	int err = 0;

E
Eric Dumazet 已提交
1045
	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
	for(;;) {
		release_sock(sk);
		skb = skb_dequeue(&sk->sk_receive_queue);
		if (skb == NULL) {
			*timeo = schedule_timeout(*timeo);
			skb = skb_dequeue(&sk->sk_receive_queue);
		}
		lock_sock(sk);
		if (skb != NULL)
			break;
		err = -EINVAL;
		if (sk->sk_state != TCP_LISTEN)
			break;
		err = sock_intr_errno(*timeo);
		if (signal_pending(current))
			break;
		err = -EAGAIN;
		if (!*timeo)
			break;
E
Eric Dumazet 已提交
1065
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
1066
	}
E
Eric Dumazet 已提交
1067
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080

	return skb == NULL ? ERR_PTR(err) : skb;
}

static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
{
	struct sock *sk = sock->sk, *newsk;
	struct sk_buff *skb = NULL;
	struct dn_skb_cb *cb;
	unsigned char menuver;
	int err = 0;
	unsigned char type;
	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
E
Eric Dumazet 已提交
1081
	struct dst_entry *dst;
L
Linus Torvalds 已提交
1082 1083 1084

	lock_sock(sk);

1085
	if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
L
Linus Torvalds 已提交
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
		release_sock(sk);
		return -EINVAL;
	}

	skb = skb_dequeue(&sk->sk_receive_queue);
	if (skb == NULL) {
		skb = dn_wait_for_connect(sk, &timeo);
		if (IS_ERR(skb)) {
			release_sock(sk);
			return PTR_ERR(skb);
		}
	}

	cb = DN_SKB_CB(skb);
	sk->sk_ack_backlog--;
1101
	newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
L
Linus Torvalds 已提交
1102 1103 1104 1105 1106 1107 1108
	if (newsk == NULL) {
		release_sock(sk);
		kfree_skb(skb);
		return -ENOBUFS;
	}
	release_sock(sk);

E
Eric Dumazet 已提交
1109
	dst = skb_dst(skb);
E
Eric Dumazet 已提交
1110
	sk_dst_set(newsk, dst);
E
Eric Dumazet 已提交
1111
	skb_dst_set(skb, NULL);
L
Linus Torvalds 已提交
1112

1113
	DN_SK(newsk)->state        = DN_CR;
L
Linus Torvalds 已提交
1114 1115 1116 1117 1118
	DN_SK(newsk)->addrrem      = cb->src_port;
	DN_SK(newsk)->services_rem = cb->services;
	DN_SK(newsk)->info_rem     = cb->info;
	DN_SK(newsk)->segsize_rem  = cb->segsize;
	DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1119

L
Linus Torvalds 已提交
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
	if (DN_SK(newsk)->segsize_rem < 230)
		DN_SK(newsk)->segsize_rem = 230;

	if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
		DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;

	newsk->sk_state  = TCP_LISTEN;
	memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));

	/*
	 * If we are listening on a wild socket, we don't want
	 * the newly created socket on the wrong hash queue.
	 */
	DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;

	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1137 1138
	*(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
	*(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
L
Linus Torvalds 已提交
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168

	menuver = *skb->data;
	skb_pull(skb, 1);

	if (menuver & DN_MENUVER_ACC)
		dn_access_copy(skb, &(DN_SK(newsk)->accessdata));

	if (menuver & DN_MENUVER_USR)
		dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));

	if (menuver & DN_MENUVER_PRX)
		DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;

	if (menuver & DN_MENUVER_UIC)
		DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;

	kfree_skb(skb);

	memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
		sizeof(struct optdata_dn));
	memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
		sizeof(struct optdata_dn));

	lock_sock(newsk);
	err = dn_hash_sock(newsk);
	if (err == 0) {
		sock_reset_flag(newsk, SOCK_ZAPPED);
		dn_send_conn_ack(newsk);

		/*
1169 1170 1171
		 * Here we use sk->sk_allocation since although the conn conf is
		 * for the newsk, the context is the old socket.
		 */
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		if (DN_SK(newsk)->accept_mode == ACC_IMMED)
			err = dn_confirm_accept(newsk, &timeo,
						sk->sk_allocation);
	}
	release_sock(newsk);
1177
	return err;
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}


static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
{
	struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);

	*uaddr_len = sizeof(struct sockaddr_dn);

	lock_sock(sk);

	if (peer) {
1192 1193
		if ((sock->state != SS_CONNECTED &&
		     sock->state != SS_CONNECTING) &&
1194
		    scp->accept_mode == ACC_IMMED) {
1195
			release_sock(sk);
L
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			return -ENOTCONN;
1197
		}
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		memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
	} else {
		memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
	}

	release_sock(sk);

1206
	return 0;
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}


static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	int mask = datagram_poll(file, sock, wait);

1216
	if (!skb_queue_empty(&scp->other_receive_queue))
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		mask |= POLLRDBAND;

	return mask;
}

static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	int err = -EOPNOTSUPP;
	long amount = 0;
	struct sk_buff *skb;
	int val;

	switch(cmd)
	{
	case SIOCGIFADDR:
	case SIOCSIFADDR:
		return dn_dev_ioctl(cmd, (void __user *)arg);

	case SIOCATMARK:
		lock_sock(sk);
1239
		val = !skb_queue_empty(&scp->other_receive_queue);
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		if (scp->state != DN_RUN)
			val = -ENOTCONN;
		release_sock(sk);
		return val;

	case TIOCOUTQ:
1246
		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
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		if (amount < 0)
			amount = 0;
		err = put_user(amount, (int __user *)arg);
		break;

	case TIOCINQ:
		lock_sock(sk);
1254 1255
		skb = skb_peek(&scp->other_receive_queue);
		if (skb) {
L
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			amount = skb->len;
		} else {
1258
			skb_queue_walk(&sk->sk_receive_queue, skb)
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				amount += skb->len;
		}
		release_sock(sk);
		err = put_user(amount, (int __user *)arg);
		break;

	default:
1266
		err = -ENOIOCTLCMD;
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		break;
	}

	return err;
}

static int dn_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	int err = -EINVAL;

	lock_sock(sk);

	if (sock_flag(sk, SOCK_ZAPPED))
		goto out;

	if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
		goto out;

	sk->sk_max_ack_backlog = backlog;
	sk->sk_ack_backlog     = 0;
	sk->sk_state           = TCP_LISTEN;
	err                 = 0;
	dn_rehash_sock(sk);

out:
	release_sock(sk);

1295
	return err;
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}


static int dn_shutdown(struct socket *sock, int how)
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	int err = -ENOTCONN;

	lock_sock(sk);

	if (sock->state == SS_UNCONNECTED)
		goto out;

	err = 0;
	if (sock->state == SS_DISCONNECTING)
		goto out;

	err = -EINVAL;
	if (scp->state == DN_O)
		goto out;

1318
	if (how != SHUT_RDWR)
L
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		goto out;

1321
	sk->sk_shutdown = SHUTDOWN_MASK;
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	dn_destroy_sock(sk);
	err = 0;

out:
	release_sock(sk);

	return err;
}

1331
static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
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{
	struct sock *sk = sock->sk;
	int err;

	lock_sock(sk);
	err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
	release_sock(sk);

	return err;
}

1343
static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
L
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{
	struct	sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	long timeo;
	union {
		struct optdata_dn opt;
		struct accessdata_dn acc;
		int mode;
		unsigned long win;
		int val;
		unsigned char services;
		unsigned char info;
	} u;
	int err;

	if (optlen && !optval)
		return -EINVAL;

	if (optlen > sizeof(u))
		return -EINVAL;

	if (copy_from_user(&u, optval, optlen))
		return -EFAULT;

J
Joe Perches 已提交
1368 1369 1370 1371 1372 1373
	switch (optname) {
	case DSO_CONDATA:
		if (sock->state == SS_CONNECTED)
			return -EISCONN;
		if ((scp->state != DN_O) && (scp->state != DN_CR))
			return -EINVAL;
L
Linus Torvalds 已提交
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J
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		if (optlen != sizeof(struct optdata_dn))
			return -EINVAL;
L
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1377

J
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1378 1379
		if (le16_to_cpu(u.opt.opt_optl) > 16)
			return -EINVAL;
L
Linus Torvalds 已提交
1380

J
Joe Perches 已提交
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		memcpy(&scp->conndata_out, &u.opt, optlen);
		break;
L
Linus Torvalds 已提交
1383

J
Joe Perches 已提交
1384 1385 1386 1387
	case DSO_DISDATA:
		if (sock->state != SS_CONNECTED &&
		    scp->accept_mode == ACC_IMMED)
			return -ENOTCONN;
L
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1388

J
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1389 1390
		if (optlen != sizeof(struct optdata_dn))
			return -EINVAL;
L
Linus Torvalds 已提交
1391

J
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1392 1393
		if (le16_to_cpu(u.opt.opt_optl) > 16)
			return -EINVAL;
L
Linus Torvalds 已提交
1394

J
Joe Perches 已提交
1395 1396
		memcpy(&scp->discdata_out, &u.opt, optlen);
		break;
L
Linus Torvalds 已提交
1397

J
Joe Perches 已提交
1398 1399 1400 1401 1402
	case DSO_CONACCESS:
		if (sock->state == SS_CONNECTED)
			return -EISCONN;
		if (scp->state != DN_O)
			return -EINVAL;
L
Linus Torvalds 已提交
1403

J
Joe Perches 已提交
1404 1405
		if (optlen != sizeof(struct accessdata_dn))
			return -EINVAL;
L
Linus Torvalds 已提交
1406

J
Joe Perches 已提交
1407 1408 1409 1410
		if ((u.acc.acc_accl > DN_MAXACCL) ||
		    (u.acc.acc_passl > DN_MAXACCL) ||
		    (u.acc.acc_userl > DN_MAXACCL))
			return -EINVAL;
L
Linus Torvalds 已提交
1411

J
Joe Perches 已提交
1412 1413
		memcpy(&scp->accessdata, &u.acc, optlen);
		break;
L
Linus Torvalds 已提交
1414

J
Joe Perches 已提交
1415 1416 1417 1418 1419
	case DSO_ACCEPTMODE:
		if (sock->state == SS_CONNECTED)
			return -EISCONN;
		if (scp->state != DN_O)
			return -EINVAL;
L
Linus Torvalds 已提交
1420

J
Joe Perches 已提交
1421 1422
		if (optlen != sizeof(int))
			return -EINVAL;
L
Linus Torvalds 已提交
1423

J
Joe Perches 已提交
1424 1425
		if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
			return -EINVAL;
L
Linus Torvalds 已提交
1426

J
Joe Perches 已提交
1427 1428
		scp->accept_mode = (unsigned char)u.mode;
		break;
L
Linus Torvalds 已提交
1429

J
Joe Perches 已提交
1430 1431 1432 1433 1434 1435
	case DSO_CONACCEPT:
		if (scp->state != DN_CR)
			return -EINVAL;
		timeo = sock_rcvtimeo(sk, 0);
		err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
		return err;
L
Linus Torvalds 已提交
1436

J
Joe Perches 已提交
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	case DSO_CONREJECT:
		if (scp->state != DN_CR)
			return -EINVAL;
L
Linus Torvalds 已提交
1440

J
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		scp->state = DN_DR;
		sk->sk_shutdown = SHUTDOWN_MASK;
		dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
		break;
L
Linus Torvalds 已提交
1445

J
Joe Perches 已提交
1446
	default:
L
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1447 1448 1449
#ifdef CONFIG_NETFILTER
		return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
#endif
J
Joe Perches 已提交
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
	case DSO_LINKINFO:
	case DSO_STREAM:
	case DSO_SEQPACKET:
		return -ENOPROTOOPT;

	case DSO_MAXWINDOW:
		if (optlen != sizeof(unsigned long))
			return -EINVAL;
		if (u.win > NSP_MAX_WINDOW)
			u.win = NSP_MAX_WINDOW;
		if (u.win == 0)
			return -EINVAL;
		scp->max_window = u.win;
		if (scp->snd_window > u.win)
			scp->snd_window = u.win;
		break;
L
Linus Torvalds 已提交
1466

J
Joe Perches 已提交
1467 1468 1469 1470 1471 1472 1473 1474
	case DSO_NODELAY:
		if (optlen != sizeof(int))
			return -EINVAL;
		if (scp->nonagle == 2)
			return -EINVAL;
		scp->nonagle = (u.val == 0) ? 0 : 1;
		/* if (scp->nonagle == 1) { Push pending frames } */
		break;
L
Linus Torvalds 已提交
1475

J
Joe Perches 已提交
1476 1477 1478 1479 1480 1481 1482 1483
	case DSO_CORK:
		if (optlen != sizeof(int))
			return -EINVAL;
		if (scp->nonagle == 1)
			return -EINVAL;
		scp->nonagle = (u.val == 0) ? 0 : 2;
		/* if (scp->nonagle == 0) { Push pending frames } */
		break;
L
Linus Torvalds 已提交
1484

J
Joe Perches 已提交
1485 1486 1487 1488 1489 1490 1491 1492 1493
	case DSO_SERVICES:
		if (optlen != sizeof(unsigned char))
			return -EINVAL;
		if ((u.services & ~NSP_FC_MASK) != 0x01)
			return -EINVAL;
		if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
			return -EINVAL;
		scp->services_loc = u.services;
		break;
L
Linus Torvalds 已提交
1494

J
Joe Perches 已提交
1495 1496 1497 1498 1499 1500 1501
	case DSO_INFO:
		if (optlen != sizeof(unsigned char))
			return -EINVAL;
		if (u.info & 0xfc)
			return -EINVAL;
		scp->info_loc = u.info;
		break;
L
Linus Torvalds 已提交
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
	}

	return 0;
}

static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	int err;

	lock_sock(sk);
	err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
	release_sock(sk);

	return err;
}

static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
{
	struct	sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	struct linkinfo_dn link;
	unsigned int r_len;
	void *r_data = NULL;
	unsigned int val;

	if(get_user(r_len , optlen))
		return -EFAULT;
1530

J
Joe Perches 已提交
1531 1532 1533 1534 1535 1536
	switch (optname) {
	case DSO_CONDATA:
		if (r_len > sizeof(struct optdata_dn))
			r_len = sizeof(struct optdata_dn);
		r_data = &scp->conndata_in;
		break;
L
Linus Torvalds 已提交
1537

J
Joe Perches 已提交
1538 1539 1540 1541 1542
	case DSO_DISDATA:
		if (r_len > sizeof(struct optdata_dn))
			r_len = sizeof(struct optdata_dn);
		r_data = &scp->discdata_in;
		break;
L
Linus Torvalds 已提交
1543

J
Joe Perches 已提交
1544 1545 1546 1547 1548
	case DSO_CONACCESS:
		if (r_len > sizeof(struct accessdata_dn))
			r_len = sizeof(struct accessdata_dn);
		r_data = &scp->accessdata;
		break;
L
Linus Torvalds 已提交
1549

J
Joe Perches 已提交
1550 1551 1552 1553 1554
	case DSO_ACCEPTMODE:
		if (r_len > sizeof(unsigned char))
			r_len = sizeof(unsigned char);
		r_data = &scp->accept_mode;
		break;
L
Linus Torvalds 已提交
1555

J
Joe Perches 已提交
1556 1557 1558
	case DSO_LINKINFO:
		if (r_len > sizeof(struct linkinfo_dn))
			r_len = sizeof(struct linkinfo_dn);
1559

J
Joe Perches 已提交
1560
		memset(&link, 0, sizeof(link));
L
Linus Torvalds 已提交
1561

J
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1562 1563 1564 1565 1566 1567 1568 1569 1570
		switch (sock->state) {
		case SS_CONNECTING:
			link.idn_linkstate = LL_CONNECTING;
			break;
		case SS_DISCONNECTING:
			link.idn_linkstate = LL_DISCONNECTING;
			break;
		case SS_CONNECTED:
			link.idn_linkstate = LL_RUNNING;
L
Linus Torvalds 已提交
1571 1572
			break;
		default:
J
Joe Perches 已提交
1573 1574 1575 1576 1577 1578 1579 1580
			link.idn_linkstate = LL_INACTIVE;
		}

		link.idn_segsize = scp->segsize_rem;
		r_data = &link;
		break;

	default:
L
Linus Torvalds 已提交
1581
#ifdef CONFIG_NETFILTER
J
Joe Perches 已提交
1582 1583
	{
		int ret, len;
1584

J
Joe Perches 已提交
1585 1586
		if (get_user(len, optlen))
			return -EFAULT;
1587

J
Joe Perches 已提交
1588 1589 1590 1591 1592
		ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
		if (ret >= 0)
			ret = put_user(len, optlen);
		return ret;
	}
L
Linus Torvalds 已提交
1593
#endif
J
Joe Perches 已提交
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604
	case DSO_STREAM:
	case DSO_SEQPACKET:
	case DSO_CONACCEPT:
	case DSO_CONREJECT:
		return -ENOPROTOOPT;

	case DSO_MAXWINDOW:
		if (r_len > sizeof(unsigned long))
			r_len = sizeof(unsigned long);
		r_data = &scp->max_window;
		break;
L
Linus Torvalds 已提交
1605

J
Joe Perches 已提交
1606 1607 1608 1609 1610 1611
	case DSO_NODELAY:
		if (r_len > sizeof(int))
			r_len = sizeof(int);
		val = (scp->nonagle == 1);
		r_data = &val;
		break;
L
Linus Torvalds 已提交
1612

J
Joe Perches 已提交
1613 1614 1615 1616 1617 1618
	case DSO_CORK:
		if (r_len > sizeof(int))
			r_len = sizeof(int);
		val = (scp->nonagle == 2);
		r_data = &val;
		break;
L
Linus Torvalds 已提交
1619

J
Joe Perches 已提交
1620 1621 1622 1623 1624
	case DSO_SERVICES:
		if (r_len > sizeof(unsigned char))
			r_len = sizeof(unsigned char);
		r_data = &scp->services_rem;
		break;
L
Linus Torvalds 已提交
1625

J
Joe Perches 已提交
1626 1627 1628 1629 1630
	case DSO_INFO:
		if (r_len > sizeof(unsigned char))
			r_len = sizeof(unsigned char);
		r_data = &scp->info_rem;
		break;
L
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1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
	}

	if (r_data) {
		if (copy_to_user(optval, r_data, r_len))
			return -EFAULT;
		if (put_user(r_len, optlen))
			return -EFAULT;
	}

	return 0;
}


static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
{
1646
	struct sk_buff *skb;
L
Linus Torvalds 已提交
1647 1648 1649
	int len = 0;

	if (flags & MSG_OOB)
1650
		return !skb_queue_empty(q) ? 1 : 0;
L
Linus Torvalds 已提交
1651

1652
	skb_queue_walk(q, skb) {
L
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1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682
		struct dn_skb_cb *cb = DN_SKB_CB(skb);
		len += skb->len;

		if (cb->nsp_flags & 0x40) {
			/* SOCK_SEQPACKET reads to EOM */
			if (sk->sk_type == SOCK_SEQPACKET)
				return 1;
			/* so does SOCK_STREAM unless WAITALL is specified */
			if (!(flags & MSG_WAITALL))
				return 1;
		}

		/* minimum data length for read exceeded */
		if (len >= target)
			return 1;
	}

	return 0;
}


static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
	struct msghdr *msg, size_t size, int flags)
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	struct sk_buff_head *queue = &sk->sk_receive_queue;
	size_t target = size > 1 ? 1 : 0;
	size_t copied = 0;
	int rv = 0;
1683
	struct sk_buff *skb, *n;
L
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1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
	struct dn_skb_cb *cb = NULL;
	unsigned char eor = 0;
	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);

	lock_sock(sk);

	if (sock_flag(sk, SOCK_ZAPPED)) {
		rv = -EADDRNOTAVAIL;
		goto out;
	}

	if (sk->sk_shutdown & RCV_SHUTDOWN) {
P
Patrick Caulfield 已提交
1696
		rv = 0;
L
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1697 1698 1699
		goto out;
	}

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1700 1701 1702 1703
	rv = dn_check_state(sk, NULL, 0, &timeo, flags);
	if (rv)
		goto out;

1704
	if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
L
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1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
		rv = -EOPNOTSUPP;
		goto out;
	}

	if (flags & MSG_OOB)
		queue = &scp->other_receive_queue;

	if (flags & MSG_WAITALL)
		target = size;


	/*
	 * See if there is data ready to read, sleep if there isn't
	 */
	for(;;) {
1720 1721
		DEFINE_WAIT(wait);

L
Linus Torvalds 已提交
1722 1723 1724
		if (sk->sk_err)
			goto out;

1725
		if (!skb_queue_empty(&scp->other_receive_queue)) {
L
Linus Torvalds 已提交
1726 1727 1728 1729 1730 1731 1732 1733
			if (!(flags & MSG_OOB)) {
				msg->msg_flags |= MSG_OOB;
				if (!scp->other_report) {
					scp->other_report = 1;
					goto out;
				}
			}
		}
1734

L
Linus Torvalds 已提交
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750
		if (scp->state != DN_RUN)
			goto out;

		if (signal_pending(current)) {
			rv = sock_intr_errno(timeo);
			goto out;
		}

		if (dn_data_ready(sk, queue, flags, target))
			break;

		if (flags & MSG_DONTWAIT) {
			rv = -EWOULDBLOCK;
			goto out;
		}

E
Eric Dumazet 已提交
1751
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1752 1753 1754
		set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
		sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
		clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
E
Eric Dumazet 已提交
1755
		finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
1756 1757
	}

1758
	skb_queue_walk_safe(queue, skb, n) {
L
Linus Torvalds 已提交
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
		unsigned int chunk = skb->len;
		cb = DN_SKB_CB(skb);

		if ((chunk + copied) > size)
			chunk = size - copied;

		if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
			rv = -EFAULT;
			break;
		}
		copied += chunk;

		if (!(flags & MSG_PEEK))
			skb_pull(skb, chunk);

		eor = cb->nsp_flags & 0x40;

		if (skb->len == 0) {
D
David S. Miller 已提交
1777
			skb_unlink(skb, queue);
L
Linus Torvalds 已提交
1778
			kfree_skb(skb);
1779
			/*
L
Linus Torvalds 已提交
1780 1781 1782 1783 1784 1785 1786 1787 1788
			 * N.B. Don't refer to skb or cb after this point
			 * in loop.
			 */
			if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
				scp->flowloc_sw = DN_SEND;
				dn_nsp_send_link(sk, DN_SEND, 0);
			}
		}

1789
		if (eor) {
L
Linus Torvalds 已提交
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
			if (sk->sk_type == SOCK_SEQPACKET)
				break;
			if (!(flags & MSG_WAITALL))
				break;
		}

		if (flags & MSG_OOB)
			break;

		if (copied >= target)
			break;
	}

	rv = copied;


	if (eor && (sk->sk_type == SOCK_SEQPACKET))
		msg->msg_flags |= MSG_EOR;

out:
	if (rv == 0)
		rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);

	if ((rv >= 0) && msg->msg_name) {
		memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
		msg->msg_namelen = sizeof(struct sockaddr_dn);
	}

	release_sock(sk);

	return rv;
}


static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
{
	unsigned char fctype = scp->services_rem & NSP_FC_MASK;
	if (skb_queue_len(queue) >= scp->snd_window)
		return 1;
	if (fctype != NSP_FC_NONE) {
		if (flags & MSG_OOB) {
			if (scp->flowrem_oth == 0)
				return 1;
		} else {
			if (scp->flowrem_dat == 0)
				return 1;
		}
	}
	return 0;
}

/*
1842
 * The DECnet spec requires that the "routing layer" accepts packets which
L
Linus Torvalds 已提交
1843 1844 1845 1846 1847 1848
 * are at least 230 bytes in size. This excludes any headers which the NSP
 * layer might add, so we always assume that we'll be using the maximal
 * length header on data packets. The variation in length is due to the
 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
 * make much practical difference.
 */
1849
unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
L
Linus Torvalds 已提交
1850
{
1851
	unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
L
Linus Torvalds 已提交
1852
	if (dev) {
1853
		struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
L
Linus Torvalds 已提交
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
		mtu -= LL_RESERVED_SPACE(dev);
		if (dn_db->use_long)
			mtu -= 21;
		else
			mtu -= 6;
		mtu -= DN_MAX_NSP_DATA_HEADER;
	} else {
		/*
		 * 21 = long header, 16 = guess at MAC header length
		 */
		mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
	}
	if (mtu > mss)
		mss = mtu;
	return mss;
}

static inline unsigned int dn_current_mss(struct sock *sk, int flags)
{
	struct dst_entry *dst = __sk_dst_get(sk);
	struct dn_scp *scp = DN_SK(sk);
	int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);

	/* Other data messages are limited to 16 bytes per packet */
	if (flags & MSG_OOB)
		return 16;

	/* This works out the maximum size of segment we can send out */
	if (dst) {
		u32 mtu = dst_mtu(dst);
		mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
	}

	return mss_now;
}

1890
/*
1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902
 * N.B. We get the timeout wrong here, but then we always did get it
 * wrong before and this is another step along the road to correcting
 * it. It ought to get updated each time we pass through the routine,
 * but in practise it probably doesn't matter too much for now.
 */
static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
			      unsigned long datalen, int noblock,
			      int *errcode)
{
	struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
						   noblock, errcode);
	if (skb) {
1903
		skb->protocol = htons(ETH_P_DNA_RT);
1904 1905 1906 1907 1908
		skb->pkt_type = PACKET_OUTGOING;
	}
	return skb;
}

L
Linus Torvalds 已提交
1909
static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1910
		      struct msghdr *msg, size_t size)
L
Linus Torvalds 已提交
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
{
	struct sock *sk = sock->sk;
	struct dn_scp *scp = DN_SK(sk);
	size_t mss;
	struct sk_buff_head *queue = &scp->data_xmit_queue;
	int flags = msg->msg_flags;
	int err = 0;
	size_t sent = 0;
	int addr_len = msg->msg_namelen;
	struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
	struct sk_buff *skb = NULL;
	struct dn_skb_cb *cb;
	size_t len;
	unsigned char fctype;
1925
	long timeo;
L
Linus Torvalds 已提交
1926 1927 1928 1929 1930 1931 1932

	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
		return -EOPNOTSUPP;

	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
		return -EINVAL;

1933 1934
	lock_sock(sk);
	timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
L
Linus Torvalds 已提交
1935 1936 1937 1938 1939 1940
	/*
	 * The only difference between stream sockets and sequenced packet
	 * sockets is that the stream sockets always behave as if MSG_EOR
	 * has been set.
	 */
	if (sock->type == SOCK_STREAM) {
1941 1942 1943 1944
		if (flags & MSG_EOR) {
			err = -EINVAL;
			goto out;
		}
L
Linus Torvalds 已提交
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
		flags |= MSG_EOR;
	}


	err = dn_check_state(sk, addr, addr_len, &timeo, flags);
	if (err)
		goto out_err;

	if (sk->sk_shutdown & SEND_SHUTDOWN) {
		err = -EPIPE;
P
Patrick Caulfield 已提交
1955 1956
		if (!(flags & MSG_NOSIGNAL))
			send_sig(SIGPIPE, current, 0);
L
Linus Torvalds 已提交
1957 1958 1959 1960
		goto out_err;
	}

	if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
E
Eric Dumazet 已提交
1961
		dst_negative_advice(sk);
L
Linus Torvalds 已提交
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000

	mss = scp->segsize_rem;
	fctype = scp->services_rem & NSP_FC_MASK;

	mss = dn_current_mss(sk, flags);

	if (flags & MSG_OOB) {
		queue = &scp->other_xmit_queue;
		if (size > mss) {
			err = -EMSGSIZE;
			goto out;
		}
	}

	scp->persist_fxn = dn_nsp_xmit_timeout;

	while(sent < size) {
		err = sock_error(sk);
		if (err)
			goto out;

		if (signal_pending(current)) {
			err = sock_intr_errno(timeo);
			goto out;
		}

		/*
		 * Calculate size that we wish to send.
		 */
		len = size - sent;

		if (len > mss)
			len = mss;

		/*
		 * Wait for queue size to go down below the window
		 * size.
		 */
		if (dn_queue_too_long(scp, queue, flags)) {
2001 2002
			DEFINE_WAIT(wait);

L
Linus Torvalds 已提交
2003 2004 2005 2006 2007
			if (flags & MSG_DONTWAIT) {
				err = -EWOULDBLOCK;
				goto out;
			}

E
Eric Dumazet 已提交
2008
			prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2009 2010 2011 2012
			set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
			sk_wait_event(sk, &timeo,
				      !dn_queue_too_long(scp, queue, flags));
			clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
E
Eric Dumazet 已提交
2013
			finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
2014 2015 2016 2017 2018
			continue;
		}

		/*
		 * Get a suitably sized skb.
2019 2020 2021
		 * 64 is a bit of a hack really, but its larger than any
		 * link-layer headers and has served us well as a good
		 * guess as to their real length.
L
Linus Torvalds 已提交
2022
		 */
2023 2024
		skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
					 flags & MSG_DONTWAIT, &err);
L
Linus Torvalds 已提交
2025 2026 2027 2028 2029 2030 2031 2032 2033

		if (err)
			break;

		if (!skb)
			continue;

		cb = DN_SKB_CB(skb);

2034
		skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
L
Linus Torvalds 已提交
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050

		if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
			err = -EFAULT;
			goto out;
		}

		if (flags & MSG_OOB) {
			cb->nsp_flags = 0x30;
			if (fctype != NSP_FC_NONE)
				scp->flowrem_oth--;
		} else {
			cb->nsp_flags = 0x00;
			if (scp->seg_total == 0)
				cb->nsp_flags |= 0x20;

			scp->seg_total += len;
2051

L
Linus Torvalds 已提交
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
			if (((sent + len) == size) && (flags & MSG_EOR)) {
				cb->nsp_flags |= 0x40;
				scp->seg_total = 0;
				if (fctype == NSP_FC_SCMC)
					scp->flowrem_dat--;
			}
			if (fctype == NSP_FC_SRC)
				scp->flowrem_dat--;
		}

		sent += len;
		dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
		skb = NULL;

		scp->persist = dn_nsp_persist(sk);

	}
out:

2071
	kfree_skb(skb);
L
Linus Torvalds 已提交
2072 2073 2074 2075 2076 2077

	release_sock(sk);

	return sent ? sent : err;

out_err:
2078
	err = sk_stream_error(sk, flags, err);
L
Linus Torvalds 已提交
2079 2080 2081 2082 2083 2084 2085 2086 2087
	release_sock(sk);
	return err;
}

static int dn_device_event(struct notifier_block *this, unsigned long event,
			void *ptr)
{
	struct net_device *dev = (struct net_device *)ptr;

2088
	if (!net_eq(dev_net(dev), &init_net))
2089 2090
		return NOTIFY_DONE;

J
Joe Perches 已提交
2091 2092 2093 2094 2095 2096 2097 2098 2099
	switch (event) {
	case NETDEV_UP:
		dn_dev_up(dev);
		break;
	case NETDEV_DOWN:
		dn_dev_down(dev);
		break;
	default:
		break;
L
Linus Torvalds 已提交
2100 2101 2102 2103 2104 2105 2106 2107 2108
	}

	return NOTIFY_DONE;
}

static struct notifier_block dn_dev_notifier = {
	.notifier_call = dn_device_event,
};

D
David S. Miller 已提交
2109
extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
L
Linus Torvalds 已提交
2110

2111
static struct packet_type dn_dix_packet_type __read_mostly = {
2112
	.type =		cpu_to_be16(ETH_P_DNA_RT),
L
Linus Torvalds 已提交
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
	.func =		dn_route_rcv,
};

#ifdef CONFIG_PROC_FS
struct dn_iter_state {
	int bucket;
};

static struct sock *dn_socket_get_first(struct seq_file *seq)
{
	struct dn_iter_state *state = seq->private;
	struct sock *n = NULL;

	for(state->bucket = 0;
	    state->bucket < DN_SK_HASH_SIZE;
	    ++state->bucket) {
		n = sk_head(&dn_sk_hash[state->bucket]);
		if (n)
			break;
	}

	return n;
}

static struct sock *dn_socket_get_next(struct seq_file *seq,
				       struct sock *n)
{
	struct dn_iter_state *state = seq->private;

	n = sk_next(n);
try_again:
	if (n)
		goto out;
	if (++state->bucket >= DN_SK_HASH_SIZE)
		goto out;
	n = sk_head(&dn_sk_hash[state->bucket]);
	goto try_again;
out:
	return n;
}

static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
{
	struct sock *sk = dn_socket_get_first(seq);

	if (sk) {
		while(*pos && (sk = dn_socket_get_next(seq, sk)))
			--*pos;
	}
	return *pos ? NULL : sk;
}

static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
{
	void *rc;
	read_lock_bh(&dn_hash_lock);
	rc = socket_get_idx(seq, &pos);
	if (!rc) {
		read_unlock_bh(&dn_hash_lock);
	}
	return rc;
}

static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
{
	return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	void *rc;

	if (v == SEQ_START_TOKEN) {
		rc = dn_socket_get_idx(seq, 0);
		goto out;
	}

	rc = dn_socket_get_next(seq, v);
	if (rc)
		goto out;
	read_unlock_bh(&dn_hash_lock);
out:
	++*pos;
	return rc;
}

static void dn_socket_seq_stop(struct seq_file *seq, void *v)
{
	if (v && v != SEQ_START_TOKEN)
		read_unlock_bh(&dn_hash_lock);
}

#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)

static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
{
	int i;
2210

2211
	switch (le16_to_cpu(dn->sdn_objnamel)) {
J
Joe Perches 已提交
2212 2213 2214 2215 2216 2217 2218 2219 2220 2221
	case 0:
		sprintf(buf, "%d", dn->sdn_objnum);
		break;
	default:
		for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
			buf[i] = dn->sdn_objname[i];
			if (IS_NOT_PRINTABLE(buf[i]))
				buf[i] = '.';
		}
		buf[i] = 0;
2222
	}
L
Linus Torvalds 已提交
2223 2224 2225 2226
}

static char *dn_state2asc(unsigned char state)
{
J
Joe Perches 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259
	switch (state) {
	case DN_O:
		return "OPEN";
	case DN_CR:
		return "  CR";
	case DN_DR:
		return "  DR";
	case DN_DRC:
		return " DRC";
	case DN_CC:
		return "  CC";
	case DN_CI:
		return "  CI";
	case DN_NR:
		return "  NR";
	case DN_NC:
		return "  NC";
	case DN_CD:
		return "  CD";
	case DN_RJ:
		return "  RJ";
	case DN_RUN:
		return " RUN";
	case DN_DI:
		return "  DI";
	case DN_DIC:
		return " DIC";
	case DN_DN:
		return "  DN";
	case DN_CL:
		return "  CL";
	case DN_CN:
		return "  CN";
L
Linus Torvalds 已提交
2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
	}

	return "????";
}

static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);
	char buf1[DN_ASCBUF_LEN];
	char buf2[DN_ASCBUF_LEN];
	char local_object[DN_MAXOBJL+3];
	char remote_object[DN_MAXOBJL+3];

	dn_printable_object(&scp->addr, local_object);
	dn_printable_object(&scp->peer, remote_object);

	seq_printf(seq,
		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2279
		   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
L
Linus Torvalds 已提交
2280 2281 2282 2283 2284 2285 2286
		   scp->addrloc,
		   scp->numdat,
		   scp->numoth,
		   scp->ackxmt_dat,
		   scp->ackxmt_oth,
		   scp->flowloc_sw,
		   local_object,
2287
		   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
L
Linus Torvalds 已提交
2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
		   scp->addrrem,
		   scp->numdat_rcv,
		   scp->numoth_rcv,
		   scp->ackrcv_dat,
		   scp->ackrcv_oth,
		   scp->flowrem_sw,
		   remote_object,
		   dn_state2asc(scp->state),
		   ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
}

static int dn_socket_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, "Local                                              Remote\n");
	} else {
		dn_socket_format_entry(seq, v);
	}
	return 0;
}

2309
static const struct seq_operations dn_socket_seq_ops = {
L
Linus Torvalds 已提交
2310 2311 2312 2313 2314 2315 2316 2317
	.start	= dn_socket_seq_start,
	.next	= dn_socket_seq_next,
	.stop	= dn_socket_seq_stop,
	.show	= dn_socket_seq_show,
};

static int dn_socket_seq_open(struct inode *inode, struct file *file)
{
2318 2319
	return seq_open_private(file, &dn_socket_seq_ops,
			sizeof(struct dn_iter_state));
L
Linus Torvalds 已提交
2320 2321
}

2322
static const struct file_operations dn_socket_seq_fops = {
L
Linus Torvalds 已提交
2323 2324 2325 2326 2327 2328 2329 2330
	.owner		= THIS_MODULE,
	.open		= dn_socket_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release_private,
};
#endif

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static const struct net_proto_family	dn_family_ops = {
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	.family =	AF_DECnet,
	.create =	dn_create,
	.owner	=	THIS_MODULE,
};

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static const struct proto_ops dn_proto_ops = {
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	.family =	AF_DECnet,
	.owner =	THIS_MODULE,
	.release =	dn_release,
	.bind =		dn_bind,
	.connect =	dn_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	dn_accept,
	.getname =	dn_getname,
	.poll =		dn_poll,
	.ioctl =	dn_ioctl,
	.listen =	dn_listen,
	.shutdown =	dn_shutdown,
	.setsockopt =	dn_setsockopt,
	.getsockopt =	dn_getsockopt,
	.sendmsg =	dn_sendmsg,
	.recvmsg =	dn_recvmsg,
	.mmap =		sock_no_mmap,
	.sendpage =	sock_no_sendpage,
};

void dn_register_sysctl(void);
void dn_unregister_sysctl(void);

MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
MODULE_AUTHOR("Linux DECnet Project Team");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_DECnet);

static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";

static int __init decnet_init(void)
{
	int rc;

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	printk(banner);
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	rc = proto_register(&dn_proto, 1);
	if (rc != 0)
		goto out;

	dn_neigh_init();
	dn_dev_init();
	dn_route_init();
	dn_fib_init();

	sock_register(&dn_family_ops);
	dev_add_pack(&dn_dix_packet_type);
	register_netdevice_notifier(&dn_dev_notifier);

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	proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
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	dn_register_sysctl();
out:
	return rc;

}
module_init(decnet_init);

/*
 * Prevent DECnet module unloading until its fixed properly.
 * Requires an audit of the code to check for memory leaks and
 * initialisation problems etc.
 */
#if 0
static void __exit decnet_exit(void)
{
	sock_unregister(AF_DECnet);
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	rtnl_unregister_all(PF_DECnet);
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	dev_remove_pack(&dn_dix_packet_type);

	dn_unregister_sysctl();

	unregister_netdevice_notifier(&dn_dev_notifier);

	dn_route_cleanup();
	dn_dev_cleanup();
	dn_neigh_cleanup();
	dn_fib_cleanup();

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	remove_proc_entry("decnet", init_net.proc_net);
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	proto_unregister(&dn_proto);
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	rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
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}
module_exit(decnet_exit);
#endif