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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [decnet/] [af_decnet.c] - Blame information for rev 1275

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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
 */
 
 
/******************************************************************************
    (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
 
    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)
 
                                        First Development of DECnet Socket La-
                                        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)
                                        _
                                        Added support for incoming connections
                                        so we can start developing server apps
                                        on Linux.
                                        -
                                        Module Support
Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
                                       (emserrat@geocities.com)
                                       _
                                        Added support for X11R6.4. Now we can
                                        use DECnet transport for X on Linux!!!
                                       -
Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
                                       (emserrat@geocities.com)
                                       Removed bugs on flow control
                                       Removed bugs on incoming accessdata
                                       order
                                       -
Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
                                       dn_recvmsg fixes
 
                                        Patrick J. Caulfield
                                       dn_bind fixes
*******************************************************************************/
 
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.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 <net/sock.h>
#include <asm/segment.h>
#include <asm/system.h>
#include <asm/ioctls.h>
#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>
#include <net/neighbour.h>
#include <net/dst.h>
#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>
 
static void dn_keepalive(struct sock *sk);
 
/*
 * decnet_address is kept in network order, decnet_ether_address is kept
 * as a string of bytes.
 */
dn_address decnet_address = 0;
unsigned char decnet_ether_address[ETH_ALEN] = { 0xAA, 0x00, 0x04, 0x00, 0x00, 0x00 };
 
#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)
 
static struct proto_ops dn_proto_ops;
rwlock_t dn_hash_lock = RW_LOCK_UNLOCKED;
static struct sock *dn_sk_hash[DN_SK_HASH_SIZE];
static struct sock *dn_wild_sk;
 
static int __dn_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen, int flags);
static int __dn_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen, int flags);
 
static struct sock **dn_find_list(struct sock *sk)
{
        struct dn_scp *scp = DN_SK(sk);
 
        if (scp->addr.sdn_flags & SDF_WILD)
                return dn_wild_sk ? NULL : &dn_wild_sk;
 
        return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
}
 
/*
 * Valid ports are those greater than zero and not already in use.
 */
static int check_port(unsigned short port)
{
        struct sock *sk = dn_sk_hash[port & DN_SK_HASH_MASK];
        if (port == 0)
                return -1;
        while(sk) {
                struct dn_scp *scp = DN_SK(sk);
                if (scp->addrloc == port)
                        return -1;
                sk = sk->next;
        }
        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;
 
        while(check_port(++port) != 0) {
                if (port == i_port)
                        return 0;
        }
 
        scp->addrloc = port;
 
        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 sock **skp;
        int rv = -EUSERS;
 
        if (sk->next)
                BUG();
        if (sk->pprev)
                BUG();
 
        write_lock_bh(&dn_hash_lock);
 
        if (!scp->addrloc && !port_alloc(sk))
                goto out;
 
        rv = -EADDRINUSE;
        if ((skp = dn_find_list(sk)) == NULL)
                goto out;
 
        sk->next = *skp;
        sk->pprev = skp;
        *skp = sk;
        rv = 0;
out:
        write_unlock_bh(&dn_hash_lock);
        return rv;
}
 
static void dn_unhash_sock(struct sock *sk)
{
        struct sock **skp = sk->pprev;
 
        if (skp == NULL)
                return;
 
        write_lock(&dn_hash_lock);
        while(*skp != sk)
                skp = &((*skp)->next);
        *skp = sk->next;
        write_unlock(&dn_hash_lock);
 
        sk->next = NULL;
        sk->pprev = NULL;
}
 
static void dn_unhash_sock_bh(struct sock *sk)
{
        struct sock **skp = sk->pprev;
 
        if (skp == NULL)
                return;
 
        write_lock_bh(&dn_hash_lock);
        while(*skp != sk)
                skp = &((*skp)->next);
        *skp = sk->next;
        write_unlock_bh(&dn_hash_lock);
 
        sk->next = NULL;
        sk->pprev = NULL;
}
 
struct sock **listen_hash(struct sockaddr_dn *addr)
{
        int i;
        unsigned hash = addr->sdn_objnum;
 
        if (hash == 0) {
                hash = addr->sdn_objnamel;
                for(i = 0; i < addr->sdn_objnamel; i++) {
                        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 sock **skp = sk->pprev;
        struct dn_scp *scp = DN_SK(sk);
 
        if (scp->addr.sdn_flags & SDF_WILD)
                return;
 
        write_lock_bh(&dn_hash_lock);
        while(*skp != sk)
                skp = &((*skp)->next);
        *skp = sk->next;
 
        DN_SK(sk)->addrloc = 0;
        skp = listen_hash(&DN_SK(sk)->addr);
 
        sk->next = *skp;
        sk->pprev = skp;
        *skp = sk;
        write_unlock_bh(&dn_hash_lock);
}
 
int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
{
        int len = 2;
 
        *buf++ = type;
 
        switch(type) {
                case 0:
                        *buf++ = sdn->sdn_objnum;
                        break;
                case 1:
                        *buf++ = 0;
                        *buf++ = dn_ntohs(sdn->sdn_objnamel);
                        memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
                        len = 3 + dn_ntohs(sdn->sdn_objnamel);
                        break;
                case 2:
                        memset(buf, 0, 5);
                        buf += 5;
                        *buf++ = dn_ntohs(sdn->sdn_objnamel);
                        memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
                        len = 7 + dn_ntohs(sdn->sdn_objnamel);
                        break;
        }
 
        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;
        sdn->sdn_objnamel = dn_htons(0);
        memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 
        if (len < 2)
                return -1;
 
        len -= 2;
        *fmt = *data++;
        type = *data++;
 
        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;
        }
 
        len -= 1;
 
        if (len < 0)
                return -1;
 
        sdn->sdn_objnamel = dn_htons(*data++);
        len -= dn_ntohs(sdn->sdn_objnamel);
 
        if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
                return -1;
 
        memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
 
        return size - len;
}
 
struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
{
        struct sock **skp = listen_hash(addr);
        struct sock *sk;
 
        read_lock(&dn_hash_lock);
        for(sk = *skp; sk != NULL; sk = sk->next) {
                struct dn_scp *scp = DN_SK(sk);
                if (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;
                        if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
                                continue;
                }
                sock_hold(sk);
                read_unlock(&dn_hash_lock);
                return sk;
        }
 
        if (dn_wild_sk && (dn_wild_sk->state == TCP_LISTEN))
                sock_hold((sk = dn_wild_sk));
 
        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 dn_scp *scp;
 
        read_lock(&dn_hash_lock);
        sk = dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK];
        for (; sk != NULL; sk = sk->next) {
                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;
                break;
        }
 
        if (sk)
                sock_hold(sk);
 
        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);
 
        dst_release(xchg(&sk->dst_cache, NULL));
 
        MOD_DEC_USE_COUNT;
}
 
struct sock *dn_alloc_sock(struct socket *sock, int gfp)
{
        struct sock *sk;
        struct dn_scp *scp;
 
        if  ((sk = sk_alloc(PF_DECnet, gfp, 1)) == NULL)
                goto no_sock;
 
        if (sock) {
                        sock->ops = &dn_proto_ops;
        }
        sock_init_data(sock,sk);
        scp = DN_SK(sk);
 
        sk->backlog_rcv = dn_nsp_backlog_rcv;
        sk->destruct    = dn_destruct;
        sk->no_check    = 1;
        sk->family      = PF_DECnet;
        sk->protocol    = 0;
        sk->allocation  = gfp;
 
        /* Initialization of DECnet Session Control Port                */
        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*/
        scp->flowrem_sw = DN_SEND;
        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; /* Default: Updated by remote segsize */
        scp->segsize_loc = 1450; /* Best guess for ethernet */
        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);
 
        MOD_INC_USE_COUNT;
 
        return sk;
no_sock:
        return NULL;
}
 
/*
 * 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.
         */
        if (skb_queue_len(&scp->other_xmit_queue) == 0)
                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);
 
        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;
 
                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;
 
                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;
                        }
        }
 
        scp->persist = (HZ * decnet_time_wait);
 
        if (sk->socket)
                return 0;
 
        dn_stop_fast_timer(sk); /* unlikely, but possible that this is runninng */
        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->socket) {
                if (sk->socket->state != SS_UNCONNECTED)
                        sk->socket->state = SS_DISCONNECTING;
        }
 
        sk->state = TCP_CLOSE;
 
        switch(scp->state) {
                case DN_DN:
                        dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, 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:
disc_reject:
                        dn_nsp_send_disc(sk, NSP_DISCINIT, 0, 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_fast_timer(sk);
                        dn_stop_slow_timer(sk);
 
                        dn_unhash_sock_bh(sk);
                        sock_put(sk);
 
                        break;
        }
}
 
char *dn_addr2asc(dn_address addr, char *buf)
{
        unsigned short node, area;
 
        node = addr & 0x03ff;
        area = addr >> 10;
        sprintf(buf, "%hd.%hd", area, node);
 
        return buf;
}
 
 
static char *dn_state2asc(unsigned char state)
{
        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";
        }
 
        return "????";
}
 
static int dn_create(struct socket *sock, int protocol)
{
        struct sock *sk;
 
        switch(sock->type) {
                case SOCK_SEQPACKET:
                        if (protocol != DNPROTO_NSP)
                                return -EPROTONOSUPPORT;
                        break;
                case SOCK_STREAM:
                        break;
                default:
                        return -ESOCKTNOSUPPORT;
        }
 
 
        if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
                return -ENOBUFS;
 
        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);
        }
 
        return 0;
}
 
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;
        struct net_device *dev;
        int rv;
 
        if (sk->zapped == 0)
                return -EINVAL;
 
        if (addr_len != sizeof(struct sockaddr_dn))
                return -EINVAL;
 
        if (saddr->sdn_family != AF_DECnet)
                return -EINVAL;
 
        if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
                return -EINVAL;
 
        if (saddr->sdn_objnum && !capable(CAP_NET_BIND_SERVICE))
                return -EPERM;
 
        if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
                return -EINVAL;
 
        if (saddr->sdn_flags & ~SDF_WILD)
                return -EINVAL;
 
        if (saddr->sdn_flags & SDF_WILD) {
                if (!capable(CAP_NET_BIND_SERVICE))
                        return -EPERM;
        } else {
                if (dn_ntohs(saddr->sdn_nodeaddrl)) {
                        read_lock(&dev_base_lock);
                        for(dev = dev_base; dev; dev = dev->next) {
                                if (!dev->dn_ptr)
                                        continue;
                                if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
                                        break;
                        }
                        read_unlock(&dev_base_lock);
                        if (dev == NULL)
                                return -EADDRNOTAVAIL;
                }
        }
 
 
        memcpy(&scp->addr, saddr, addr_len);
        sk->zapped = 0;
 
        if ((rv = dn_hash_sock(sk)) != 0)
                sk->zapped = 1;
 
        return rv;
}
 
 
static int dn_auto_bind(struct socket *sock)
{
        struct sock *sk = sock->sk;
        struct dn_scp *scp = DN_SK(sk);
 
        sk->zapped = 0;
 
        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)) {
 
                scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
                memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 
                scp->accessdata.acc_accl = 0;
                memset(scp->accessdata.acc_acc, 0, 40);
        }
 
        scp->addr.sdn_add.a_len = dn_htons(2);
        *(dn_address *)scp->addr.sdn_add.a_addr = decnet_address;
 
        dn_hash_sock(sk);
 
        return 0;
}
 
 
static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
{
        struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
        struct sock *sk = sock->sk;
        struct dn_scp *scp = DN_SK(sk);
        int err = -EISCONN;
 
        lock_sock(sk);
 
        if (sock->state == SS_CONNECTED)
                goto out;
 
        if (sock->state == SS_CONNECTING) {
                err = 0;
                if (sk->state == TCP_ESTABLISHED)
                        goto out;
 
                err = -ECONNREFUSED;
                if (sk->state == TCP_CLOSE)
                        goto out;
        }
 
        err = -EINVAL;
        if (DN_SK(sk)->state != DN_O)
                goto out;
 
        if (addr_len != sizeof(struct sockaddr_dn))
                goto out;
 
        if (addr->sdn_family != AF_DECnet)
                goto out;
 
        if (addr->sdn_flags & SDF_WILD)
                goto out;
 
        err = -EADDRNOTAVAIL;
        if (sk->zapped && (err = dn_auto_bind(sock)))
                goto out;
 
        memcpy(&scp->peer, addr, addr_len);
 
        err = -EHOSTUNREACH;
        if (dn_route_output(&sk->dst_cache, dn_saddr2dn(&scp->peer), dn_saddr2dn(&scp->addr), 0) < 0)
                goto out;
 
        sk->state   = TCP_SYN_SENT;
        sock->state = SS_CONNECTING;
        DN_SK(sk)->state = DN_CI;
 
        dn_nsp_send_conninit(sk, NSP_CI);
 
        err = -EINPROGRESS;
        if ((sk->state == TCP_SYN_SENT) && (flags & O_NONBLOCK))
                goto out;
 
        while(sk->state == TCP_SYN_SENT) {
 
                err = -ERESTARTSYS;
                if (signal_pending(current))
                        goto out;
 
                if ((err = sock_error(sk)) != 0) {
                        sock->state = SS_UNCONNECTED;
                        goto out;
                }
 
                SOCK_SLEEP_PRE(sk);
 
                if (sk->state == TCP_SYN_SENT)
                        schedule();
 
                SOCK_SLEEP_POST(sk);
        }
 
        if (sk->state != TCP_ESTABLISHED) {
                sock->state = SS_UNCONNECTED;
                err = sock_error(sk);
                goto out;
        }
 
        err = 0;
        sock->state = SS_CONNECTED;
out:
        release_sock(sk);
 
        return err;
}
 
static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
{
        unsigned char *ptr = skb->data;
 
        acc->acc_userl = *ptr++;
        memcpy(&acc->acc_user, ptr, acc->acc_userl);
        ptr += acc->acc_userl;
 
        acc->acc_passl = *ptr++;
        memcpy(&acc->acc_pass, ptr, acc->acc_passl);
        ptr += acc->acc_passl;
 
        acc->acc_accl = *ptr++;
        memcpy(&acc->acc_acc, ptr, acc->acc_accl);
 
        skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
 
}
 
static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
{
        unsigned char *ptr = skb->data;
 
        opt->opt_optl   = *ptr++;
        opt->opt_status = 0;
        memcpy(opt->opt_data, ptr, opt->opt_optl);
        skb_pull(skb, opt->opt_optl + 1);
 
}
 
 
/*
 * This is here for use in the sockopt() call as well as
 * in accept(). Must be called with a locked socket.
 */
static int dn_wait_accept(struct socket *sock, int flags)
{
        struct sock *sk = sock->sk;
 
        while(sk->state == TCP_LISTEN) {
                if (flags & O_NONBLOCK) {
                        return -EAGAIN;
                }
 
                SOCK_SLEEP_PRE(sk)
 
                if (sk->state == TCP_LISTEN)
                        schedule();
 
                SOCK_SLEEP_POST(sk)
 
                if (signal_pending(current))
                        return -ERESTARTSYS; /* But of course you don't! */
        }
 
        if ((DN_SK(sk)->state != DN_RUN) && (DN_SK(sk)->state != DN_DRC)) {
                sock->state = SS_UNCONNECTED;
                return sock_error(sk);
        }
 
        sock->state = SS_CONNECTED;
 
        return 0;
}
 
 
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;
 
        lock_sock(sk);
 
        if (sk->state != TCP_LISTEN) {
                release_sock(sk);
                return -EINVAL;
        }
 
        if (DN_SK(sk)->state != DN_O) {
                release_sock(sk);
                return -EINVAL;
        }
 
        do
        {
                if ((skb = skb_dequeue(&sk->receive_queue)) == NULL)
                {
                        if (flags & O_NONBLOCK)
                        {
                                release_sock(sk);
                                return -EAGAIN;
                        }
 
                        SOCK_SLEEP_PRE(sk);
 
                        if (!skb_peek(&sk->receive_queue))
                                schedule();
 
                        SOCK_SLEEP_POST(sk);
 
                        if (signal_pending(current))
                        {
                                release_sock(sk);
                                return -ERESTARTSYS;
                        }
                }
        } while (skb == NULL);
 
        cb = DN_SKB_CB(skb);
 
        if ((newsk = dn_alloc_sock(newsock, sk->allocation)) == NULL) {
                release_sock(sk);
                kfree_skb(skb);
                return -ENOBUFS;
        }
        sk->ack_backlog--;
        release_sock(sk);
 
        dst_release(xchg(&newsk->dst_cache, skb->dst));
        skb->dst = NULL;
 
        DN_SK(newsk)->state        = DN_CR;
        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;
 
        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->state  = TCP_LISTEN;
        newsk->zapped = 0;
 
        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));
        *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
        *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
 
        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);
        /*
         * FIXME: This can fail if we've run out of local ports....
         */
        dn_hash_sock(newsk);
 
        dn_send_conn_ack(newsk);
 
        /*
         * Here we use sk->allocation since although the conn conf is
         * for the newsk, the context is the old socket.
         */
        if (DN_SK(newsk)->accept_mode == ACC_IMMED) {
                DN_SK(newsk)->state = DN_CC;
                dn_send_conn_conf(newsk, sk->allocation);
                err = dn_wait_accept(newsock, flags);
        }
 
        release_sock(newsk);
        return err;
}
 
 
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) {
                if ((sock->state != SS_CONNECTED &&
                     sock->state != SS_CONNECTING) &&
                    scp->accept_mode == ACC_IMMED)
                        return -ENOTCONN;
 
                memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
        } else {
                memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
        }
 
        release_sock(sk);
 
        return 0;
}
 
 
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);
 
        if (skb_queue_len(&scp->other_receive_queue))
                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 *)arg);
 
        case SIOCATMARK:
                lock_sock(sk);
                val = (skb_queue_len(&scp->other_receive_queue) != 0);
                if (scp->state != DN_RUN)
                        val = -ENOTCONN;
                release_sock(sk);
                return val;
 
#ifdef CONFIG_DECNET_ROUTER
        case SIOCADDRT:
        case SIOCDELRT:
                return dn_fib_ioctl(sock, cmd, arg);
#endif /* CONFIG_DECNET_ROUTER */
 
        case OSIOCSNETADDR:
                if (!capable(CAP_NET_ADMIN)) {
                        err = -EPERM;
                        break;
                }
 
                dn_dev_devices_off();
 
                decnet_address = (unsigned short)arg;
                dn_dn2eth(decnet_ether_address, dn_ntohs(decnet_address));
 
                dn_dev_devices_on();
                err = 0;
                break;
 
        case OSIOCGNETADDR:
                err = put_user(decnet_address, (unsigned short *)arg);
                break;
        case SIOCGIFCONF:
        case SIOCGIFFLAGS:
        case SIOCGIFBRDADDR:
                return dev_ioctl(cmd,(void *)arg);
 
        case TIOCOUTQ:
                amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
                if (amount < 0)
                        amount = 0;
                err = put_user(amount, (int *)arg);
                break;
 
        case TIOCINQ:
                lock_sock(sk);
                if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
                        amount = skb->len;
                } else {
                        struct sk_buff *skb = sk->receive_queue.next;
                        for(;;) {
                                if (skb == (struct sk_buff *)&sk->receive_queue)
                                        break;
                                amount += skb->len;
                                skb = skb->next;
                        }
                }
                release_sock(sk);
                err = put_user(amount, (int *)arg);
                break;
        }
 
        return err;
}
 
static int dn_listen(struct socket *sock, int backlog)
{
        struct sock *sk = sock->sk;
        int err = -EINVAL;
 
        lock_sock(sk);
 
        if (sk->zapped)
                goto out;
 
        if ((DN_SK(sk)->state != DN_O) || (sk->state == TCP_LISTEN))
                goto out;
 
        sk->max_ack_backlog = backlog;
        sk->ack_backlog     = 0;
        sk->state           = TCP_LISTEN;
        err                 = 0;
        dn_rehash_sock(sk);
 
out:
        release_sock(sk);
 
        return err;
}
 
 
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;
 
        if (how != SHUTDOWN_MASK)
                goto out;
 
 
        sk->shutdown = how;
        dn_destroy_sock(sk);
        err = 0;
 
out:
        release_sock(sk);
 
        return err;
}
 
static int dn_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen)
{
        struct sock *sk = sock->sk;
        int err;
 
        lock_sock(sk);
        err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
        release_sock(sk);
 
        return err;
}
 
static int __dn_setsockopt(struct socket *sock, int level,int optname, char *optval, int optlen, int flags)
{
        struct  sock *sk = sock->sk;
        struct dn_scp *scp = DN_SK(sk);
        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;
 
        switch(optname) {
                case DSO_CONDATA:
                        if (sock->state == SS_CONNECTED)
                                return -EISCONN;
                        if ((scp->state != DN_O) && (scp->state != DN_CR))
                                return -EINVAL;
 
                        if (optlen != sizeof(struct optdata_dn))
                                return -EINVAL;
 
                        if (u.opt.opt_optl > 16)
                                return -EINVAL;
 
                        memcpy(&scp->conndata_out, &u.opt, optlen);
                        break;
 
                case DSO_DISDATA:
                        if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
                                return -ENOTCONN;
 
                        if (optlen != sizeof(struct optdata_dn))
                                return -EINVAL;
 
                        if (u.opt.opt_optl > 16)
                                return -EINVAL;
 
                        memcpy(&scp->discdata_out, &u.opt, optlen);
                        break;
 
                case DSO_CONACCESS:
                        if (sock->state == SS_CONNECTED)
                                return -EISCONN;
                        if (scp->state != DN_O)
                                return -EINVAL;
 
                        if (optlen != sizeof(struct accessdata_dn))
                                return -EINVAL;
 
                        if ((u.acc.acc_accl > DN_MAXACCL) ||
                                        (u.acc.acc_passl > DN_MAXACCL) ||
                                        (u.acc.acc_userl > DN_MAXACCL))
                                return -EINVAL;
 
                        memcpy(&scp->accessdata, &u.acc, optlen);
                        break;
 
                case DSO_ACCEPTMODE:
                        if (sock->state == SS_CONNECTED)
                                return -EISCONN;
                        if (scp->state != DN_O)
                                return -EINVAL;
 
                        if (optlen != sizeof(int))
                                return -EINVAL;
 
                        if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
                                return -EINVAL;
 
                        scp->accept_mode = (unsigned char)u.mode;
                        break;
 
                case DSO_CONACCEPT:
 
                        if (scp->state != DN_CR)
                                return -EINVAL;
 
                        scp->state = DN_CC;
                        dn_send_conn_conf(sk, sk->allocation);
                        err = dn_wait_accept(sock, sock->file->f_flags);
                        return err;
 
                case DSO_CONREJECT:
 
                        if (scp->state != DN_CR)
                                return -EINVAL;
 
                        scp->state = DN_DR;
                        sk->shutdown = SHUTDOWN_MASK;
                        dn_nsp_send_disc(sk, 0x38, 0, sk->allocation);
                        break;
 
                default:
#ifdef CONFIG_NETFILTER
                return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
#endif
                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;
 
                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;
 
                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;
 
                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;
 
                case DSO_INFO:
                        if (optlen != sizeof(unsigned char))
                                return -EINVAL;
                        if (u.info & 0xfc)
                                return -EINVAL;
                        scp->info_loc = u.info;
                        break;
        }
 
        return 0;
}
 
static int dn_getsockopt(struct socket *sock, int level, int optname, char *optval, int *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 *optval,int *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;
 
        switch(optname) {
                case DSO_CONDATA:
                        if (r_len > sizeof(struct optdata_dn))
                                r_len = sizeof(struct optdata_dn);
                        r_data = &scp->conndata_in;
                        break;
 
                case DSO_DISDATA:
                        if (r_len > sizeof(struct optdata_dn))
                                r_len = sizeof(struct optdata_dn);
                        r_data = &scp->discdata_in;
                        break;
 
                case DSO_CONACCESS:
                        if (r_len > sizeof(struct accessdata_dn))
                                r_len = sizeof(struct accessdata_dn);
                        r_data = &scp->accessdata;
                        break;
 
                case DSO_ACCEPTMODE:
                        if (r_len > sizeof(unsigned char))
                                r_len = sizeof(unsigned char);
                        r_data = &scp->accept_mode;
                        break;
 
                case DSO_LINKINFO:
                        if (r_len > sizeof(struct linkinfo_dn))
                                r_len = sizeof(struct linkinfo_dn);
 
                        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;
                                        break;
                                default:
                                        link.idn_linkstate = LL_INACTIVE;
                        }
 
                        link.idn_segsize = scp->segsize_rem;
                        r_data = &link;
                        break;
 
                default:
#ifdef CONFIG_NETFILTER
                {
                        int val, len;
 
                        if(get_user(len, optlen))
                                return -EFAULT;
 
                        val = nf_getsockopt(sk, PF_DECnet, optname,
                                                        optval, &len);
                        if (val >= 0)
                                val = put_user(len, optlen);
                        return val;
                }
#endif
                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;
 
                case DSO_NODELAY:
                        if (r_len > sizeof(int))
                                r_len = sizeof(int);
                        val = (scp->nonagle == 1);
                        r_data = &val;
                        break;
 
                case DSO_CORK:
                        if (r_len > sizeof(int))
                                r_len = sizeof(int);
                        val = (scp->nonagle == 2);
                        r_data = &val;
                        break;
 
                case DSO_SERVICES:
                        if (r_len > sizeof(unsigned char))
                                r_len = sizeof(unsigned char);
                        r_data = &scp->services_rem;
                        break;
 
                case DSO_INFO:
                        if (r_len > sizeof(unsigned char))
                                r_len = sizeof(unsigned char);
                        r_data = &scp->info_rem;
                        break;
        }
 
        if (r_data) {
                if (copy_to_user(optval, r_data, r_len))
                        return -EFAULT;
                if (put_user(r_len, optlen))
                        return -EFAULT;
        }
 
        return 0;
}
 
 
/*
 * Used by send/recvmsg to wait until the socket is connected
 * before passing data.
 */
static int dn_wait_run(struct sock *sk, int flags)
{
        struct dn_scp *scp = DN_SK(sk);
        int err = 0;
 
        switch(scp->state) {
                case DN_RUN:
                        return 0;
 
                case DN_CR:
                        scp->state = DN_CC;
                        dn_send_conn_conf(sk, sk->allocation);
                        return dn_wait_accept(sk->socket, (flags & MSG_DONTWAIT) ? O_NONBLOCK : 0);
                case DN_CI:
                case DN_CC:
                        break;
                default:
                        return -ENOTCONN;
        }
 
        if (flags & MSG_DONTWAIT)
                return -EWOULDBLOCK;
 
        do {
                if ((err = sock_error(sk)) != 0)
                        break;
 
                if (signal_pending(current)) {
                        err = -ERESTARTSYS;
                        break;
                }
 
                SOCK_SLEEP_PRE(sk)
 
                if (scp->state != DN_RUN)
                        schedule();
 
                SOCK_SLEEP_POST(sk)
 
        } while(scp->state != DN_RUN);
 
        return 0;
}
 
 
static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
{
        struct sk_buff *skb = q->next;
        int len = 0;
 
        if (flags & MSG_OOB)
                return skb_queue_len(q) ? 1 : 0;
 
        while(skb != (struct sk_buff *)q) {
                struct dn_skb_cb *cb = DN_SKB_CB(skb);
                len += skb->len;
 
                if (cb->nsp_flags & 0x40) {
                        /* SOCK_SEQPACKET reads to EOM */
                        if (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;
 
                skb = skb->next;
        }
 
        return 0;
}
 
 
static int dn_recvmsg(struct socket *sock, struct msghdr *msg, int size,
        int flags, struct scm_cookie *scm)
{
        struct sock *sk = sock->sk;
        struct dn_scp *scp = DN_SK(sk);
        struct sk_buff_head *queue = &sk->receive_queue;
        int target = size > 1 ? 1 : 0;
        int copied = 0;
        int rv = 0;
        struct sk_buff *skb, *nskb;
        struct dn_skb_cb *cb = NULL;
        unsigned char eor = 0;
 
        lock_sock(sk);
 
        if (sk->zapped) {
                rv = -EADDRNOTAVAIL;
                goto out;
        }
 
        if ((rv = dn_wait_run(sk, flags)) != 0)
                goto out;
 
        if (sk->shutdown & RCV_SHUTDOWN) {
                send_sig(SIGPIPE, current, 0);
                rv = -EPIPE;
                goto out;
        }
 
        if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT)) {
                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(;;) {
                if (sk->err)
                        goto out;
 
                if (skb_queue_len(&scp->other_receive_queue)) {
                        if (!(flags & MSG_OOB)) {
                                msg->msg_flags |= MSG_OOB;
                                if (!scp->other_report) {
                                        scp->other_report = 1;
                                        goto out;
                                }
                        }
                }
 
                if (scp->state != DN_RUN)
                        goto out;
 
                if (signal_pending(current)) {
                        rv = -ERESTARTSYS;
                        goto out;
                }
 
                if (dn_data_ready(sk, queue, flags, target))
                        break;
 
                if (flags & MSG_DONTWAIT) {
                        rv = -EWOULDBLOCK;
                        goto out;
                }
 
                set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
                SOCK_SLEEP_PRE(sk)
 
                if (!dn_data_ready(sk, queue, flags, target))
                        schedule();
 
                SOCK_SLEEP_POST(sk)
                clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
        }
 
        for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
                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;
                nskb = skb->next;
 
                if (skb->len == 0) {
                        skb_unlink(skb);
                        kfree_skb(skb);
                        /*
                         * 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);
                        }
                }
 
                if (eor) {
                        if (sk->type == SOCK_SEQPACKET)
                                break;
                        if (!(flags & MSG_WAITALL))
                                break;
                }
 
                if (flags & MSG_OOB)
                        break;
 
                if (copied >= target)
                        break;
        }
 
        rv = copied;
 
 
        if (eor && (sk->type == SOCK_SEQPACKET))
                msg->msg_flags |= MSG_EOR;
 
out:
        if (rv == 0)
                rv = (flags & MSG_PEEK) ? -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;
}
 
static int dn_sendmsg(struct socket *sock, struct msghdr *msg, int size,
           struct scm_cookie *scm)
{
        struct sock *sk = sock->sk;
        struct dn_scp *scp = DN_SK(sk);
        int mss;
        struct sk_buff_head *queue = &scp->data_xmit_queue;
        int flags = msg->msg_flags;
        int err = 0;
        int 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;
        unsigned char msgflg;
        unsigned char *ptr;
        unsigned short ack;
        int len;
        unsigned char fctype;
 
        if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR))
                return -EOPNOTSUPP;
 
        if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
                return -EINVAL;
 
        if (sk->zapped && dn_auto_bind(sock))  {
                err = -EADDRNOTAVAIL;
                goto out;
        }
 
        if (scp->state == DN_O) {
                if (!addr_len || !addr) {
                        err = -ENOTCONN;
                        goto out;
                }
 
                if ((err = dn_connect(sock, (struct sockaddr *)addr, addr_len, (flags & MSG_DONTWAIT) ? O_NONBLOCK : 0)) < 0)
                        goto out;
        }
 
        lock_sock(sk);
 
        if ((err = dn_wait_run(sk, flags)) < 0)
                goto out;
 
        if (sk->shutdown & SEND_SHUTDOWN) {
                send_sig(SIGPIPE, current, 0);
                err = -EPIPE;
                goto out;
        }
 
        if ((flags & MSG_TRYHARD) && sk->dst_cache)
                dst_negative_advice(&sk->dst_cache);
 
        mss = scp->segsize_rem;
        fctype = scp->services_rem & NSP_FC_MASK;
 
        if (sk->dst_cache && sk->dst_cache->neighbour) {
                struct dn_neigh *dn = (struct dn_neigh *)sk->dst_cache->neighbour;
                if (dn->blksize < (mss + 11))
                        mss = dn->blksize - 11;
        }
 
        /*
         * The only difference between SEQPACKET & STREAM sockets under DECnet
         * is that SEQPACKET sockets set the MSG_EOR flag for the last
         * session control message segment.
         */
 
        if (flags & MSG_OOB) {
                mss = 16;
                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 = -ERESTARTSYS;
                        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)) {
                        if (flags & MSG_DONTWAIT) {
                                err = -EWOULDBLOCK;
                                goto out;
                        }
 
                        SOCK_SLEEP_PRE(sk)
 
                        if (dn_queue_too_long(scp, queue, flags))
                                schedule();
 
                        SOCK_SLEEP_POST(sk)
 
                        continue;
                }
 
                /*
                 * Get a suitably sized skb.
                 */
                skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, &err);
 
                if (err)
                        break;
 
                if (!skb)
                        continue;
 
                cb = DN_SKB_CB(skb);
 
                ptr = skb_put(skb, 9);
 
                if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
                        err = -EFAULT;
                        goto out;
                }
 
                if (flags & MSG_OOB) {
                        cb->segnum = scp->numoth;
                        seq_add(&scp->numoth, 1);
                        msgflg = 0x30;
                        ack = (scp->numoth_rcv & 0x0FFF) | 0x8000;
                        scp->ackxmt_oth = scp->numoth_rcv;
                        if (fctype != NSP_FC_NONE)
                                scp->flowrem_oth--;
                } else {
                        cb->segnum = scp->numdat;
                        seq_add(&scp->numdat, 1);
                        msgflg = 0x00;
                        if (sock->type == SOCK_STREAM)
                                msgflg = 0x60;
                        if (scp->seg_total == 0)
                                msgflg |= 0x20;
 
                        scp->seg_total += len;
 
                        if (((sent + len) == size) && (flags & MSG_EOR)) {
                                msgflg |= 0x40;
                                scp->seg_total = 0;
                                if (fctype == NSP_FC_SCMC)
                                        scp->flowrem_dat--;
                        }
                        ack = (scp->numdat_rcv & 0x0FFF) | 0x8000;
                        scp->ackxmt_dat = scp->numdat_rcv;
                        if (fctype == NSP_FC_SRC)
                                scp->flowrem_dat--;
                }
 
                *ptr++ = msgflg;
                *(__u16 *)ptr = scp->addrrem;
                ptr += 2;
                *(__u16 *)ptr = scp->addrloc;
                ptr += 2;
                *(__u16 *)ptr = dn_htons(ack);
                ptr += 2;
                *(__u16 *)ptr = dn_htons(cb->segnum);
 
                sent += len;
                dn_nsp_queue_xmit(sk, skb, sk->allocation, flags & MSG_OOB);
                skb = NULL;
 
                scp->persist = dn_nsp_persist(sk);
 
        }
out:
 
        if (skb)
                kfree_skb(skb);
 
        release_sock(sk);
 
        return sent ? sent : err;
}
 
static int dn_device_event(struct notifier_block *this, unsigned long event,
                        void *ptr)
{
        struct net_device *dev = (struct net_device *)ptr;
 
        switch(event) {
                case NETDEV_UP:
                        dn_dev_up(dev);
                        break;
                case NETDEV_DOWN:
                        dn_dev_down(dev);
                        break;
                default:
                        break;
        }
 
        return NOTIFY_DONE;
}
 
static struct notifier_block dn_dev_notifier = {
        notifier_call:  dn_device_event,
};
 
extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
 
static struct packet_type dn_dix_packet_type = {
        type:           __constant_htons(ETH_P_DNA_RT),
        dev:            NULL,           /* All devices */
        func:           dn_route_rcv,
        data:           (void*)1,
};
 
#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
 
static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
{
        int i;
 
        switch (dn_ntohs(dn->sdn_objnamel)) {
                case 0:
                        sprintf(buf, "%d", dn->sdn_objnum);
                        break;
                default:
                        for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
                                buf[i] = dn->sdn_objname[i];
                                if (IS_NOT_PRINTABLE(buf[i]))
                                        buf[i] = '.';
                        }
                        buf[i] = 0;
        }
}
 
static int dn_get_info(char *buffer, char **start, off_t offset, int length)
{
        struct sock *sk;
        struct dn_scp *scp;
        int len = 0;
        off_t pos = 0;
        off_t begin = 0;
        char buf1[DN_ASCBUF_LEN];
        char buf2[DN_ASCBUF_LEN];
        char local_object[DN_MAXOBJL+3];
        char remote_object[DN_MAXOBJL+3];
        int i;
 
        len += sprintf(buffer + len, "Local                                              Remote\n");
 
        read_lock(&dn_hash_lock);
        for(i = 0; i < DN_SK_HASH_SIZE; i++) {
                for(sk = dn_sk_hash[i]; sk != NULL; sk = sk->next) {
                        scp = DN_SK(sk);
 
                        dn_printable_object(&scp->addr, local_object);
                        dn_printable_object(&scp->peer, remote_object);
 
                        len += sprintf(buffer + len,
                                        "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
                                        dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
                                        scp->addrloc,
                                        scp->numdat,
                                        scp->numoth,
                                        scp->ackxmt_dat,
                                        scp->ackxmt_oth,
                                        scp->flowloc_sw,
                                        local_object,
                                        dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
                                        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"));
 
                        pos = begin + len;
                        if (pos < offset) {
                                len = 0;
                                begin = pos;
                        }
                        if (pos > (offset + length))
                                break;
                }
        }
        read_unlock(&dn_hash_lock);
 
        *start = buffer + (offset - begin);
        len -= (offset - begin);
 
        if (len > length)
                len = length;
 
        return len;
}
 
 
static struct net_proto_family  dn_family_ops = {
        family:         AF_DECnet,
        create:         dn_create,
};
 
static struct proto_ops dn_proto_ops = {
        family:         AF_DECnet,
 
        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,
};
 
#ifdef CONFIG_SYSCTL
void dn_register_sysctl(void);
void dn_unregister_sysctl(void);
#endif
 
 
#ifdef MODULE
EXPORT_NO_SYMBOLS;
MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
MODULE_AUTHOR("Linux DECnet Project Team");
MODULE_LICENSE("GPL");
 
static int addr[2] = {0, 0};
 
MODULE_PARM(addr, "2i");
MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
#endif
 
static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.4.20-pre1s (C) 1995-2002 Linux DECnet Project Team\n";
 
static int __init decnet_init(void)
{
#ifdef MODULE
        if (addr[0] > 63 || addr[0] < 0) {
                printk(KERN_ERR "DECnet: Area must be between 0 and 63");
                return 1;
        }
 
        if (addr[1] > 1023 || addr[1] < 0) {
                printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
                return 1;
        }
 
        decnet_address = dn_htons((addr[0] << 10) | addr[1]);
        dn_dn2eth(decnet_ether_address, dn_ntohs(decnet_address));
#endif
 
        printk(banner);
 
        sock_register(&dn_family_ops);
        dev_add_pack(&dn_dix_packet_type);
        register_netdevice_notifier(&dn_dev_notifier);
 
        proc_net_create("decnet", 0, dn_get_info);
 
        dn_neigh_init();
        dn_dev_init();
        dn_route_init();
 
#ifdef CONFIG_DECNET_ROUTER
        dn_fib_init();
#endif /* CONFIG_DECNET_ROUTER */
 
#ifdef CONFIG_SYSCTL
        dn_register_sysctl();
#endif /* CONFIG_SYSCTL */
 
        /*
         * Prevent DECnet module unloading until its fixed properly.
         * Requires an audit of the code to check for memory leaks and
         * initialisation problems etc.
         */
        MOD_INC_USE_COUNT;
 
        return 0;
 
}
 
#ifndef MODULE
static int __init decnet_setup(char *str)
{
        unsigned short area = simple_strtoul(str, &str, 0);
        unsigned short node = simple_strtoul(*str > 0 ? ++str : str, &str, 0);
 
        decnet_address = dn_htons(area << 10 | node);
        dn_dn2eth(decnet_ether_address, dn_ntohs(decnet_address));
 
        return 1;
}
 
__setup("decnet=", decnet_setup);
#endif
 
static void __exit decnet_exit(void)
{
        sock_unregister(AF_DECnet);
        dev_remove_pack(&dn_dix_packet_type);
 
#ifdef CONFIG_SYSCTL
        dn_unregister_sysctl();
#endif /* CONFIG_SYSCTL */
 
        unregister_netdevice_notifier(&dn_dev_notifier);
 
        dn_route_cleanup();
        dn_dev_cleanup();
        dn_neigh_cleanup();
 
#ifdef CONFIG_DECNET_ROUTER
        dn_fib_cleanup();
#endif /* CONFIG_DECNET_ROUTER */
 
        proc_net_remove("decnet");
}
 
module_init(decnet_init);
module_exit(decnet_exit);
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [decnet/] [af_decnet.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix
2			`/*`
3			`* DECnet An implementation of the DECnet protocol suite for the LINUX`
4			`* operating system. DECnet is implemented using the BSD Socket`
5			`* interface as the means of communication with the user level.`
6			`*`
7			`* DECnet Socket Layer Interface`
8			`*`
9			`* Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>`
10			`* Patrick Caulfield <patrick@pandh.demon.co.uk>`
11			`*`
12			`* Changes:`
13			`* Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's`
14			`* version of the code. Original copyright preserved`
15			`* below.`
16			`* Steve Whitehouse: Some bug fixes, cleaning up some code to make it`
17			`* compatible with my routing layer.`
18			`* Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick`
19			`* Caulfield.`
20			`* Steve Whitehouse: Further bug fixes, checking module code still works`
21			`* with new routing layer.`
22			`* Steve Whitehouse: Additional set/get_sockopt() calls.`
23			`* Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new`
24			`* code.`
25			`* Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like`
26			`* way. Didn't manage it entirely, but its better.`
27			`* Steve Whitehouse: ditto for sendmsg().`
28			`* Steve Whitehouse: A selection of bug fixes to various things.`
29			`* Steve Whitehouse: Added TIOCOUTQ ioctl.`
30			`* Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.`
31			`* Steve Whitehouse: Fixes to connect() error returns.`
32			`* Patrick Caulfield: Fixes to delayed acceptance logic.`
33			`* David S. Miller: New socket locking`
34			`* Steve Whitehouse: Socket list hashing/locking`
35			`* Arnaldo C. Melo: use capable, not suser`
36			`* Steve Whitehouse: Removed unused code. Fix to use sk->allocation`
37			`* when required.`
38			`* Patrick Caulfield: /proc/net/decnet now has object name/number`
39			`* Steve Whitehouse: Fixed local port allocation, hashed sk list`
40			`*/`