Viewing file:  af_decnet.c (49.89 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* 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;
unsigned 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.2.4.15-pre5s (C) 1995-2001 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);
|