renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-21 11:44:01 +08:00
Code
3bc0bb36fa
linux-next/net/decnet/af_decnet.c
Eric Dumazet 7976a11b30 net: use helpers to change sk_ack_backlog 
Writers are holding a lock, but many readers do not.

Following patch will add appropriate barriers in
sk_acceptq_removed() and sk_acceptq_added().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-11-06 16:14:48 -08:00

2404 lines
53 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DECnet An implementation of the DECnet protocol suite for the LINUX
* operating system. DECnet is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* DECnet Socket Layer Interface
*
* Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
* Patrick Caulfield <patrick@pandh.demon.co.uk>
*
* Changes:
* Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
* version of the code. Original copyright preserved
* below.
* Steve Whitehouse: Some bug fixes, cleaning up some code to make it
* compatible with my routing layer.
* Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
* Caulfield.
* Steve Whitehouse: Further bug fixes, checking module code still works
* with new routing layer.
* Steve Whitehouse: Additional set/get_sockopt() calls.
* Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
* code.
* Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
* way. Didn't manage it entirely, but its better.
* Steve Whitehouse: ditto for sendmsg().
* Steve Whitehouse: A selection of bug fixes to various things.
* Steve Whitehouse: Added TIOCOUTQ ioctl.
* Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
* Steve Whitehouse: Fixes to connect() error returns.
* Patrick Caulfield: Fixes to delayed acceptance logic.
* David S. Miller: New socket locking
* Steve Whitehouse: Socket list hashing/locking
* Arnaldo C. Melo: use capable, not suser
* Steve Whitehouse: Removed unused code. Fix to use sk->allocation
* when required.
* Patrick Caulfield: /proc/net/decnet now has object name/number
* Steve Whitehouse: Fixed local port allocation, hashed sk list
* Matthew Wilcox: Fixes for dn_ioctl()
* Steve Whitehouse: New connect/accept logic to allow timeouts and
* prepare for sendpage etc.
*/
/******************************************************************************
(c) 1995-1998 E.M. Serrat emserrat@geocities.com
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/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/inet.h>
#include <linux/route.h>
#include <linux/netfilter.h>
#include <linux/seq_file.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/flow.h>
#include <asm/ioctls.h>
#include <linux/capability.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 <linux/jiffies.h>
#include <net/net_namespace.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/fib_rules.h>
#include <net/tcp.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>
struct dn_sock {
struct sock sk;
struct dn_scp scp;
};
static void dn_keepalive(struct sock *sk);
#define DN_SK_HASH_SHIFT 8
#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
static const struct proto_ops dn_proto_ops;
static DEFINE_RWLOCK(dn_hash_lock);
static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
static struct hlist_head dn_wild_sk;
static atomic_long_t decnet_memory_allocated;
static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
static struct hlist_head *dn_find_list(struct sock *sk)
{
struct dn_scp *scp = DN_SK(sk);
if (scp->addr.sdn_flags & SDF_WILD)
return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
}
/*
* Valid ports are those greater than zero and not already in use.
*/
static int check_port(__le16 port)
{
struct sock *sk;
if (port == 0)
return -1;
sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
struct dn_scp *scp = DN_SK(sk);
if (scp->addrloc == port)
return -1;
}
return 0;
}
static unsigned short port_alloc(struct sock *sk)
{
struct dn_scp *scp = DN_SK(sk);
static unsigned short port = 0x2000;
unsigned short i_port = port;
while(check_port(cpu_to_le16(++port)) != 0) {
if (port == i_port)
return 0;
}
scp->addrloc = cpu_to_le16(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 hlist_head *list;
int rv = -EUSERS;
BUG_ON(sk_hashed(sk));
write_lock_bh(&dn_hash_lock);
if (!scp->addrloc && !port_alloc(sk))
goto out;
rv = -EADDRINUSE;
if ((list = dn_find_list(sk)) == NULL)
goto out;
sk_add_node(sk, list);
rv = 0;
out:
write_unlock_bh(&dn_hash_lock);
return rv;
}
static void dn_unhash_sock(struct sock *sk)
{
write_lock(&dn_hash_lock);
sk_del_node_init(sk);
write_unlock(&dn_hash_lock);
}
static void dn_unhash_sock_bh(struct sock *sk)
{
write_lock_bh(&dn_hash_lock);
sk_del_node_init(sk);
write_unlock_bh(&dn_hash_lock);
}
static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
{
int i;
unsigned int hash = addr->sdn_objnum;
if (hash == 0) {
hash = addr->sdn_objnamel;
for(i = 0; i < le16_to_cpu(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 hlist_head *list;
struct dn_scp *scp = DN_SK(sk);
if (scp->addr.sdn_flags & SDF_WILD)
return;
write_lock_bh(&dn_hash_lock);
sk_del_node_init(sk);
DN_SK(sk)->addrloc = 0;
list = listen_hash(&DN_SK(sk)->addr);
sk_add_node(sk, list);
write_unlock_bh(&dn_hash_lock);
}
int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
{
int len = 2;
*buf++ = type;
switch (type) {
case 0:
*buf++ = sdn->sdn_objnum;
break;
case 1:
*buf++ = 0;
*buf++ = le16_to_cpu(sdn->sdn_objnamel);
memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
len = 3 + le16_to_cpu(sdn->sdn_objnamel);
break;
case 2:
memset(buf, 0, 5);
buf += 5;
*buf++ = le16_to_cpu(sdn->sdn_objnamel);
memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
len = 7 + le16_to_cpu(sdn->sdn_objnamel);
break;
}
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 = cpu_to_le16(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 = cpu_to_le16(*data++);
len -= le16_to_cpu(sdn->sdn_objnamel);
if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
return -1;
memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
return size - len;
}
struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
{
struct hlist_head *list = listen_hash(addr);
struct sock *sk;
read_lock(&dn_hash_lock);
sk_for_each(sk, list) {
struct dn_scp *scp = DN_SK(sk);
if (sk->sk_state != TCP_LISTEN)
continue;
if (scp->addr.sdn_objnum) {
if (scp->addr.sdn_objnum != addr->sdn_objnum)
continue;
} else {
if (addr->sdn_objnum)
continue;
if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
continue;
if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
continue;
}
sock_hold(sk);
read_unlock(&dn_hash_lock);
return sk;
}
sk = sk_head(&dn_wild_sk);
if (sk) {
if (sk->sk_state == TCP_LISTEN)
sock_hold(sk);
else
sk = NULL;
}
read_unlock(&dn_hash_lock);
return sk;
}
struct sock *dn_find_by_skb(struct sk_buff *skb)
{
struct dn_skb_cb *cb = DN_SKB_CB(skb);
struct sock *sk;
struct dn_scp *scp;
read_lock(&dn_hash_lock);
sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
scp = DN_SK(sk);
if (cb->src != dn_saddr2dn(&scp->peer))
continue;
if (cb->dst_port != scp->addrloc)
continue;
if (scp->addrrem && (cb->src_port != scp->addrrem))
continue;
sock_hold(sk);
goto found;
}
sk = NULL;
found:
read_unlock(&dn_hash_lock);
return sk;
}
static void dn_destruct(struct sock *sk)
{
struct dn_scp *scp = DN_SK(sk);
skb_queue_purge(&scp->data_xmit_queue);
skb_queue_purge(&scp->other_xmit_queue);
skb_queue_purge(&scp->other_receive_queue);
dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
}
static unsigned long dn_memory_pressure;
static void dn_enter_memory_pressure(struct sock *sk)
{
if (!dn_memory_pressure) {
dn_memory_pressure = 1;
}
}
static struct proto dn_proto = {
.name = "NSP",
.owner = THIS_MODULE,
.enter_memory_pressure = dn_enter_memory_pressure,
.memory_pressure = &dn_memory_pressure,
.memory_allocated = &decnet_memory_allocated,
.sysctl_mem = sysctl_decnet_mem,
.sysctl_wmem = sysctl_decnet_wmem,
.sysctl_rmem = sysctl_decnet_rmem,
.max_header = DN_MAX_NSP_DATA_HEADER + 64,
.obj_size = sizeof(struct dn_sock),
};
static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
{
struct dn_scp *scp;
struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
if (!sk)
goto out;
if (sock)
sock->ops = &dn_proto_ops;
sock_init_data(sock, sk);
sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
sk->sk_destruct = dn_destruct;
sk->sk_no_check_tx = 1;
sk->sk_family = PF_DECnet;
sk->sk_protocol = 0;
sk->sk_allocation = gfp;
sk->sk_sndbuf = sysctl_decnet_wmem[1];
sk->sk_rcvbuf = sysctl_decnet_rmem[1];
/* Initialization of DECnet Session Control Port */
scp = DN_SK(sk);
scp->state = DN_O; /* Open */
scp->numdat = 1; /* Next data seg to tx */
scp->numoth = 1; /* Next oth data to tx */
scp->ackxmt_dat = 0; /* Last data seg ack'ed */
scp->ackxmt_oth = 0; /* Last oth data ack'ed */
scp->ackrcv_dat = 0; /* Highest data ack recv*/
scp->ackrcv_oth = 0; /* Last oth data ack rec*/
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 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
scp->nonagle = 0;
scp->multi_ireq = 1;
scp->accept_mode = ACC_IMMED;
scp->addr.sdn_family = AF_DECnet;
scp->peer.sdn_family = AF_DECnet;
scp->accessdata.acc_accl = 5;
memcpy(scp->accessdata.acc_acc, "LINUX", 5);
scp->max_window = NSP_MAX_WINDOW;
scp->snd_window = NSP_MIN_WINDOW;
scp->nsp_srtt = NSP_INITIAL_SRTT;
scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
scp->nsp_rxtshift = 0;
skb_queue_head_init(&scp->data_xmit_queue);
skb_queue_head_init(&scp->other_xmit_queue);
skb_queue_head_init(&scp->other_receive_queue);
scp->persist = 0;
scp->persist_fxn = NULL;
scp->keepalive = 10 * HZ;
scp->keepalive_fxn = dn_keepalive;
dn_start_slow_timer(sk);
out:
return sk;
}
/*
* Keepalive timer.
* FIXME: Should respond to SO_KEEPALIVE etc.
*/
static void dn_keepalive(struct sock *sk)
{
struct dn_scp *scp = DN_SK(sk);
/*
* By checking the other_data transmit queue is empty
* we are double checking that we are not sending too
* many of these keepalive frames.
*/
if (skb_queue_empty(&scp->other_xmit_queue))
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->sk_socket)
return 0;
if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
dn_unhash_sock(sk);
sock_put(sk);
return 1;
}
return 0;
}
static void dn_destroy_sock(struct sock *sk)
{
struct dn_scp *scp = DN_SK(sk);
scp->nsp_rxtshift = 0; /* reset back off */
if (sk->sk_socket) {
if (sk->sk_socket->state != SS_UNCONNECTED)
sk->sk_socket->state = SS_DISCONNECTING;
}
sk->sk_state = TCP_CLOSE;
switch (scp->state) {
case DN_DN:
dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
sk->sk_allocation);
scp->persist_fxn = dn_destroy_timer;
scp->persist = dn_nsp_persist(sk);
break;
case DN_CR:
scp->state = DN_DR;
goto disc_reject;
case DN_RUN:
scp->state = DN_DI;
/* fall through */
case DN_DI:
case DN_DR:
disc_reject:
dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
/* fall through */
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");
/* fall through */
case DN_O:
dn_stop_slow_timer(sk);
dn_unhash_sock_bh(sk);
sock_put(sk);
break;
}
}
char *dn_addr2asc(__u16 addr, char *buf)
{
unsigned short node, area;
node = addr & 0x03ff;
area = addr >> 10;
sprintf(buf, "%hd.%hd", area, node);
return buf;
}
static int dn_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct sock *sk;
if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
return -EINVAL;
if (!net_eq(net, &init_net))
return -EAFNOSUPPORT;
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(net, sock, GFP_KERNEL, kern)) == NULL)
return -ENOBUFS;
sk->sk_protocol = protocol;
return 0;
}
static int
dn_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (sk) {
sock_orphan(sk);
sock_hold(sk);
lock_sock(sk);
dn_destroy_sock(sk);
release_sock(sk);
sock_put(sk);
}
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, *ldev;
int rv;
if (addr_len != sizeof(struct sockaddr_dn))
return -EINVAL;
if (saddr->sdn_family != AF_DECnet)
return -EINVAL;
if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
return -EINVAL;
if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
return -EINVAL;
if (saddr->sdn_flags & ~SDF_WILD)
return -EINVAL;
if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
(saddr->sdn_flags & SDF_WILD)))
return -EACCES;
if (!(saddr->sdn_flags & SDF_WILD)) {
if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
rcu_read_lock();
ldev = NULL;
for_each_netdev_rcu(&init_net, dev) {
if (!dev->dn_ptr)
continue;
if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
ldev = dev;
break;
}
}
rcu_read_unlock();
if (ldev == NULL)
return -EADDRNOTAVAIL;
}
}
rv = -EINVAL;
lock_sock(sk);
if (sock_flag(sk, SOCK_ZAPPED)) {
memcpy(&scp->addr, saddr, addr_len);
sock_reset_flag(sk, SOCK_ZAPPED);
rv = dn_hash_sock(sk);
if (rv)
sock_set_flag(sk, SOCK_ZAPPED);
}
release_sock(sk);
return rv;
}
static int dn_auto_bind(struct socket *sock)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
int rv;
sock_reset_flag(sk, SOCK_ZAPPED);
scp->addr.sdn_flags = 0;
scp->addr.sdn_objnum = 0;
/*
* This stuff is to keep compatibility with Eduardo's
* patch. I hope I can dispense with it shortly...
*/
if ((scp->accessdata.acc_accl != 0) &&
(scp->accessdata.acc_accl <= 12)) {
scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
scp->accessdata.acc_accl = 0;
memset(scp->accessdata.acc_acc, 0, 40);
}
/* End of compatibility stuff */
scp->addr.sdn_add.a_len = cpu_to_le16(2);
rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
if (rv == 0) {
rv = dn_hash_sock(sk);
if (rv)
sock_set_flag(sk, SOCK_ZAPPED);
}
return rv;
}
static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
{
struct dn_scp *scp = DN_SK(sk);
DEFINE_WAIT(wait);
int err;
if (scp->state != DN_CR)
return -EINVAL;
scp->state = DN_CC;
scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
dn_send_conn_conf(sk, allocation);
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
for(;;) {
release_sock(sk);
if (scp->state == DN_CC)
*timeo = schedule_timeout(*timeo);
lock_sock(sk);
err = 0;
if (scp->state == DN_RUN)
break;
err = sock_error(sk);
if (err)
break;
err = sock_intr_errno(*timeo);
if (signal_pending(current))
break;
err = -EAGAIN;
if (!*timeo)
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(sk), &wait);
if (err == 0) {
sk->sk_socket->state = SS_CONNECTED;
} else if (scp->state != DN_CC) {
sk->sk_socket->state = SS_UNCONNECTED;
}
return err;
}
static int dn_wait_run(struct sock *sk, long *timeo)
{
struct dn_scp *scp = DN_SK(sk);
DEFINE_WAIT(wait);
int err = 0;
if (scp->state == DN_RUN)
goto out;
if (!*timeo)
return -EALREADY;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
for(;;) {
release_sock(sk);
if (scp->state == DN_CI || scp->state == DN_CC)
*timeo = schedule_timeout(*timeo);
lock_sock(sk);
err = 0;
if (scp->state == DN_RUN)
break;
err = sock_error(sk);
if (err)
break;
err = sock_intr_errno(*timeo);
if (signal_pending(current))
break;
err = -ETIMEDOUT;
if (!*timeo)
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(sk), &wait);
out:
if (err == 0) {
sk->sk_socket->state = SS_CONNECTED;
} else if (scp->state != DN_CI && scp->state != DN_CC) {
sk->sk_socket->state = SS_UNCONNECTED;
}
return err;
}
static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
{
struct socket *sock = sk->sk_socket;
struct dn_scp *scp = DN_SK(sk);
int err = -EISCONN;
struct flowidn fld;
struct dst_entry *dst;
if (sock->state == SS_CONNECTED)
goto out;
if (sock->state == SS_CONNECTING) {
err = 0;
if (scp->state == DN_RUN) {
sock->state = SS_CONNECTED;
goto out;
}
err = -ECONNREFUSED;
if (scp->state != DN_CI && scp->state != DN_CC) {
sock->state = SS_UNCONNECTED;
goto out;
}
return dn_wait_run(sk, timeo);
}
err = -EINVAL;
if (scp->state != DN_O)
goto out;
if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
goto out;
if (addr->sdn_family != AF_DECnet)
goto out;
if (addr->sdn_flags & SDF_WILD)
goto out;
if (sock_flag(sk, SOCK_ZAPPED)) {
err = dn_auto_bind(sk->sk_socket);
if (err)
goto out;
}
memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
err = -EHOSTUNREACH;
memset(&fld, 0, sizeof(fld));
fld.flowidn_oif = sk->sk_bound_dev_if;
fld.daddr = dn_saddr2dn(&scp->peer);
fld.saddr = dn_saddr2dn(&scp->addr);
dn_sk_ports_copy(&fld, scp);
fld.flowidn_proto = DNPROTO_NSP;
if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
goto out;
dst = __sk_dst_get(sk);
sk->sk_route_caps = dst->dev->features;
sock->state = SS_CONNECTING;
scp->state = DN_CI;
scp->segsize_loc = dst_metric_advmss(dst);
dn_nsp_send_conninit(sk, NSP_CI);
err = -EINPROGRESS;
if (*timeo) {
err = dn_wait_run(sk, timeo);
}
out:
return err;
}
static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
{
struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
struct sock *sk = sock->sk;
int err;
long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
lock_sock(sk);
err = __dn_connect(sk, addr, addrlen, &timeo, 0);
release_sock(sk);
return err;
}
static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
{
struct dn_scp *scp = DN_SK(sk);
switch (scp->state) {
case DN_RUN:
return 0;
case DN_CR:
return dn_confirm_accept(sk, timeo, sk->sk_allocation);
case DN_CI:
case DN_CC:
return dn_wait_run(sk, timeo);
case DN_O:
return __dn_connect(sk, addr, addrlen, timeo, flags);
}
return -EINVAL;
}
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;
u16 len = *ptr++; /* yes, it's 8bit on the wire */
BUG_ON(len > 16); /* we've checked the contents earlier */
opt->opt_optl = cpu_to_le16(len);
opt->opt_status = 0;
memcpy(opt->opt_data, ptr, len);
skb_pull(skb, len + 1);
}
static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
{
DEFINE_WAIT(wait);
struct sk_buff *skb = NULL;
int err = 0;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
for(;;) {
release_sock(sk);
skb = skb_dequeue(&sk->sk_receive_queue);
if (skb == NULL) {
*timeo = schedule_timeout(*timeo);
skb = skb_dequeue(&sk->sk_receive_queue);
}
lock_sock(sk);
if (skb != NULL)
break;
err = -EINVAL;
if (sk->sk_state != TCP_LISTEN)
break;
err = sock_intr_errno(*timeo);
if (signal_pending(current))
break;
err = -EAGAIN;
if (!*timeo)
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(sk), &wait);
return skb == NULL ? ERR_PTR(err) : skb;
}
static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
bool kern)
{
struct sock *sk = sock->sk, *newsk;
struct sk_buff *skb = NULL;
struct dn_skb_cb *cb;
unsigned char menuver;
int err = 0;
unsigned char type;
long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
struct dst_entry *dst;
lock_sock(sk);
if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
release_sock(sk);
return -EINVAL;
}
skb = skb_dequeue(&sk->sk_receive_queue);
if (skb == NULL) {
skb = dn_wait_for_connect(sk, &timeo);
if (IS_ERR(skb)) {
release_sock(sk);
return PTR_ERR(skb);
}
}
cb = DN_SKB_CB(skb);
sk_acceptq_removed(sk);
newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
if (newsk == NULL) {
release_sock(sk);
kfree_skb(skb);
return -ENOBUFS;
}
release_sock(sk);
dst = skb_dst(skb);
sk_dst_set(newsk, dst);
skb_dst_set(skb, 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->sk_state = TCP_LISTEN;
memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
/*
* If we are listening on a wild socket, we don't want
* the newly created socket on the wrong hash queue.
*/
DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
*(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
*(__le16 *)(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);
err = dn_hash_sock(newsk);
if (err == 0) {
sock_reset_flag(newsk, SOCK_ZAPPED);
dn_send_conn_ack(newsk);
/*
* Here we use sk->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)
err = dn_confirm_accept(newsk, &timeo,
sk->sk_allocation);
}
release_sock(newsk);
return err;
}
static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
{
struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
lock_sock(sk);
if (peer) {
if ((sock->state != SS_CONNECTED &&
sock->state != SS_CONNECTING) &&
scp->accept_mode == ACC_IMMED) {
release_sock(sk);
return -ENOTCONN;
}
memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
} else {
memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
}
release_sock(sk);
return sizeof(struct sockaddr_dn);
}
static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table *wait)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
__poll_t mask = datagram_poll(file, sock, wait);
if (!skb_queue_empty_lockless(&scp->other_receive_queue))
mask |= EPOLLRDBAND;
return mask;
}
static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
int err = -EOPNOTSUPP;
long amount = 0;
struct sk_buff *skb;
int val;
switch(cmd)
{
case SIOCGIFADDR:
case SIOCSIFADDR:
return dn_dev_ioctl(cmd, (void __user *)arg);
case SIOCATMARK:
lock_sock(sk);
val = !skb_queue_empty(&scp->other_receive_queue);
if (scp->state != DN_RUN)
val = -ENOTCONN;
release_sock(sk);
return val;
case TIOCOUTQ:
amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
if (amount < 0)
amount = 0;
err = put_user(amount, (int __user *)arg);
break;
case TIOCINQ:
lock_sock(sk);
skb = skb_peek(&scp->other_receive_queue);
if (skb) {
amount = skb->len;
} else {
skb_queue_walk(&sk->sk_receive_queue, skb)
amount += skb->len;
}
release_sock(sk);
err = put_user(amount, (int __user *)arg);
break;
default:
err = -ENOIOCTLCMD;
break;
}
return err;
}
static int dn_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
int err = -EINVAL;
lock_sock(sk);
if (sock_flag(sk, SOCK_ZAPPED))
goto out;
if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
goto out;
sk->sk_max_ack_backlog = backlog;
sk->sk_ack_backlog = 0;
sk->sk_state = TCP_LISTEN;
err = 0;
dn_rehash_sock(sk);
out:
release_sock(sk);
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 != SHUT_RDWR)
goto out;
sk->sk_shutdown = SHUTDOWN_MASK;
dn_destroy_sock(sk);
err = 0;
out:
release_sock(sk);
return err;
}
static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
int err;
lock_sock(sk);
err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
release_sock(sk);
#ifdef CONFIG_NETFILTER
/* we need to exclude all possible ENOPROTOOPTs except default case */
if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
optname != DSO_STREAM && optname != DSO_SEQPACKET)
err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
#endif
return err;
}
static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
long timeo;
union {
struct optdata_dn opt;
struct accessdata_dn acc;
int mode;
unsigned long win;
int val;
unsigned char services;
unsigned char info;
} u;
int err;
if (optlen && !optval)
return -EINVAL;
if (optlen > sizeof(u))
return -EINVAL;
if (copy_from_user(&u, optval, optlen))
return -EFAULT;
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 (le16_to_cpu(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 (le16_to_cpu(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;
timeo = sock_rcvtimeo(sk, 0);
err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
return err;
case DSO_CONREJECT:
if (scp->state != DN_CR)
return -EINVAL;
scp->state = DN_DR;
sk->sk_shutdown = SHUTDOWN_MASK;
dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
break;
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 == TCP_NAGLE_CORK)
return -EINVAL;
scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
/* if (scp->nonagle == 1) { Push pending frames } */
break;
case DSO_CORK:
if (optlen != sizeof(int))
return -EINVAL;
if (scp->nonagle == TCP_NAGLE_OFF)
return -EINVAL;
scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
/* 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;
case DSO_LINKINFO:
case DSO_STREAM:
case DSO_SEQPACKET:
default:
return -ENOPROTOOPT;
}
return 0;
}
static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
int err;
lock_sock(sk);
err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
release_sock(sk);
#ifdef CONFIG_NETFILTER
if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
optname != DSO_CONREJECT) {
int len;
if (get_user(len, optlen))
return -EFAULT;
err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
if (err >= 0)
err = put_user(len, optlen);
}
#endif
return err;
}
static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
struct linkinfo_dn link;
unsigned int r_len;
void *r_data = NULL;
unsigned int val;
if(get_user(r_len , optlen))
return -EFAULT;
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);
memset(&link, 0, sizeof(link));
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;
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 == TCP_NAGLE_OFF);
r_data = &val;
break;
case DSO_CORK:
if (r_len > sizeof(int))
r_len = sizeof(int);
val = (scp->nonagle == TCP_NAGLE_CORK);
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;
case DSO_STREAM:
case DSO_SEQPACKET:
case DSO_CONACCEPT:
case DSO_CONREJECT:
default:
return -ENOPROTOOPT;
}
if (r_data) {
if (copy_to_user(optval, r_data, r_len))
return -EFAULT;
if (put_user(r_len, optlen))
return -EFAULT;
}
return 0;
}
static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
{
struct sk_buff *skb;
int len = 0;
if (flags & MSG_OOB)
return !skb_queue_empty(q) ? 1 : 0;
skb_queue_walk(q, skb) {
struct dn_skb_cb *cb = DN_SKB_CB(skb);
len += skb->len;
if (cb->nsp_flags & 0x40) {
/* SOCK_SEQPACKET reads to EOM */
if (sk->sk_type == SOCK_SEQPACKET)
return 1;
/* so does SOCK_STREAM unless WAITALL is specified */
if (!(flags & MSG_WAITALL))
return 1;
}
/* minimum data length for read exceeded */
if (len >= target)
return 1;
}
return 0;
}
static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
int flags)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
struct sk_buff_head *queue = &sk->sk_receive_queue;
size_t target = size > 1 ? 1 : 0;
size_t copied = 0;
int rv = 0;
struct sk_buff *skb, *n;
struct dn_skb_cb *cb = NULL;
unsigned char eor = 0;
long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
lock_sock(sk);
if (sock_flag(sk, SOCK_ZAPPED)) {
rv = -EADDRNOTAVAIL;
goto out;
}
if (sk->sk_shutdown & RCV_SHUTDOWN) {
rv = 0;
goto out;
}
rv = dn_check_state(sk, NULL, 0, &timeo, flags);
if (rv)
goto out;
if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
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(;;) {
DEFINE_WAIT_FUNC(wait, woken_wake_function);
if (sk->sk_err)
goto out;
if (!skb_queue_empty(&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 = sock_intr_errno(timeo);
goto out;
}
if (dn_data_ready(sk, queue, flags, target))
break;
if (flags & MSG_DONTWAIT) {
rv = -EWOULDBLOCK;
goto out;
}
add_wait_queue(sk_sleep(sk), &wait);
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
remove_wait_queue(sk_sleep(sk), &wait);
}
skb_queue_walk_safe(queue, skb, n) {
unsigned int chunk = skb->len;
cb = DN_SKB_CB(skb);
if ((chunk + copied) > size)
chunk = size - copied;
if (memcpy_to_msg(msg, skb->data, chunk)) {
rv = -EFAULT;
break;
}
copied += chunk;
if (!(flags & MSG_PEEK))
skb_pull(skb, chunk);
eor = cb->nsp_flags & 0x40;
if (skb->len == 0) {
skb_unlink(skb, queue);
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->sk_type == SOCK_SEQPACKET)
break;
if (!(flags & MSG_WAITALL))
break;
}
if (flags & MSG_OOB)
break;
if (copied >= target)
break;
}
rv = copied;
if (eor && (sk->sk_type == SOCK_SEQPACKET))
msg->msg_flags |= MSG_EOR;
out:
if (rv == 0)
rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
if ((rv >= 0) && msg->msg_name) {
__sockaddr_check_size(sizeof(struct sockaddr_dn));
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;
}
/*
* The DECnet spec requires that the "routing layer" accepts packets which
* are at least 230 bytes in size. This excludes any headers which the NSP
* layer might add, so we always assume that we'll be using the maximal
* length header on data packets. The variation in length is due to the
* inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
* make much practical difference.
*/
unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
{
unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
if (dev) {
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
mtu -= LL_RESERVED_SPACE(dev);
if (dn_db->use_long)
mtu -= 21;
else
mtu -= 6;
mtu -= DN_MAX_NSP_DATA_HEADER;
} else {
/*
* 21 = long header, 16 = guess at MAC header length
*/
mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
}
if (mtu > mss)
mss = mtu;
return mss;
}
static inline unsigned int dn_current_mss(struct sock *sk, int flags)
{
struct dst_entry *dst = __sk_dst_get(sk);
struct dn_scp *scp = DN_SK(sk);
int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
/* Other data messages are limited to 16 bytes per packet */
if (flags & MSG_OOB)
return 16;
/* This works out the maximum size of segment we can send out */
if (dst) {
u32 mtu = dst_mtu(dst);
mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
}
return mss_now;
}
/*
* N.B. We get the timeout wrong here, but then we always did get it
* wrong before and this is another step along the road to correcting
* it. It ought to get updated each time we pass through the routine,
* but in practise it probably doesn't matter too much for now.
*/
static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
unsigned long datalen, int noblock,
int *errcode)
{
struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
noblock, errcode);
if (skb) {
skb->protocol = htons(ETH_P_DNA_RT);
skb->pkt_type = PACKET_OUTGOING;
}
return skb;
}
static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
{
struct sock *sk = sock->sk;
struct dn_scp *scp = DN_SK(sk);
size_t mss;
struct sk_buff_head *queue = &scp->data_xmit_queue;
int flags = msg->msg_flags;
int err = 0;
size_t sent = 0;
int addr_len = msg->msg_namelen;
DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
struct sk_buff *skb = NULL;
struct dn_skb_cb *cb;
size_t len;
unsigned char fctype;
long timeo;
if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
return -EOPNOTSUPP;
if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
return -EINVAL;
lock_sock(sk);
timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
/*
* The only difference between stream sockets and sequenced packet
* sockets is that the stream sockets always behave as if MSG_EOR
* has been set.
*/
if (sock->type == SOCK_STREAM) {
if (flags & MSG_EOR) {
err = -EINVAL;
goto out;
}
flags |= MSG_EOR;
}
err = dn_check_state(sk, addr, addr_len, &timeo, flags);
if (err)
goto out_err;
if (sk->sk_shutdown & SEND_SHUTDOWN) {
err = -EPIPE;
if (!(flags & MSG_NOSIGNAL))
send_sig(SIGPIPE, current, 0);
goto out_err;
}
if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
dst_negative_advice(sk);
mss = scp->segsize_rem;
fctype = scp->services_rem & NSP_FC_MASK;
mss = dn_current_mss(sk, flags);
if (flags & MSG_OOB) {
queue = &scp->other_xmit_queue;
if (size > mss) {
err = -EMSGSIZE;
goto out;
}
}
scp->persist_fxn = dn_nsp_xmit_timeout;
while(sent < size) {
err = sock_error(sk);
if (err)
goto out;
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
goto out;
}
/*
* Calculate size that we wish to send.
*/
len = size - sent;
if (len > mss)
len = mss;
/*
* Wait for queue size to go down below the window
* size.
*/
if (dn_queue_too_long(scp, queue, flags)) {
DEFINE_WAIT_FUNC(wait, woken_wake_function);
if (flags & MSG_DONTWAIT) {
err = -EWOULDBLOCK;
goto out;
}
add_wait_queue(sk_sleep(sk), &wait);
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
sk_wait_event(sk, &timeo,
!dn_queue_too_long(scp, queue, flags), &wait);
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
remove_wait_queue(sk_sleep(sk), &wait);
continue;
}
/*
* Get a suitably sized skb.
* 64 is a bit of a hack really, but its larger than any
* link-layer headers and has served us well as a good
* guess as to their real length.
*/
skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
flags & MSG_DONTWAIT, &err);
if (err)
break;
if (!skb)
continue;
cb = DN_SKB_CB(skb);
skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
err = -EFAULT;
goto out;
}
if (flags & MSG_OOB) {
cb->nsp_flags = 0x30;
if (fctype != NSP_FC_NONE)
scp->flowrem_oth--;
} else {
cb->nsp_flags = 0x00;
if (scp->seg_total == 0)
cb->nsp_flags |= 0x20;
scp->seg_total += len;
if (((sent + len) == size) && (flags & MSG_EOR)) {
cb->nsp_flags |= 0x40;
scp->seg_total = 0;
if (fctype == NSP_FC_SCMC)
scp->flowrem_dat--;
}
if (fctype == NSP_FC_SRC)
scp->flowrem_dat--;
}
sent += len;
dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
skb = NULL;
scp->persist = dn_nsp_persist(sk);
}
out:
kfree_skb(skb);
release_sock(sk);
return sent ? sent : err;
out_err:
err = sk_stream_error(sk, flags, err);
release_sock(sk);
return err;
}
static int dn_device_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
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,
};
static struct packet_type dn_dix_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_DNA_RT),
.func = dn_route_rcv,
};
#ifdef CONFIG_PROC_FS
struct dn_iter_state {
int bucket;
};
static struct sock *dn_socket_get_first(struct seq_file *seq)
{
struct dn_iter_state *state = seq->private;
struct sock *n = NULL;
for(state->bucket = 0;
state->bucket < DN_SK_HASH_SIZE;
++state->bucket) {
n = sk_head(&dn_sk_hash[state->bucket]);
if (n)
break;
}
return n;
}
static struct sock *dn_socket_get_next(struct seq_file *seq,
struct sock *n)
{
struct dn_iter_state *state = seq->private;
n = sk_next(n);
try_again:
if (n)
goto out;
if (++state->bucket >= DN_SK_HASH_SIZE)
goto out;
n = sk_head(&dn_sk_hash[state->bucket]);
goto try_again;
out:
return n;
}
static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
{
struct sock *sk = dn_socket_get_first(seq);
if (sk) {
while(*pos && (sk = dn_socket_get_next(seq, sk)))
--*pos;
}
return *pos ? NULL : sk;
}
static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
{
void *rc;
read_lock_bh(&dn_hash_lock);
rc = socket_get_idx(seq, &pos);
if (!rc) {
read_unlock_bh(&dn_hash_lock);
}
return rc;
}
static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
{
return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}
static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
void *rc;
if (v == SEQ_START_TOKEN) {
rc = dn_socket_get_idx(seq, 0);
goto out;
}
rc = dn_socket_get_next(seq, v);
if (rc)
goto out;
read_unlock_bh(&dn_hash_lock);
out:
++*pos;
return rc;
}
static void dn_socket_seq_stop(struct seq_file *seq, void *v)
{
if (v && v != SEQ_START_TOKEN)
read_unlock_bh(&dn_hash_lock);
}
#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
{
int i;
switch (le16_to_cpu(dn->sdn_objnamel)) {
case 0:
sprintf(buf, "%d", dn->sdn_objnum);
break;
default:
for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
buf[i] = dn->sdn_objname[i];
if (IS_NOT_PRINTABLE(buf[i]))
buf[i] = '.';
}
buf[i] = 0;
}
}
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 inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
{
struct dn_scp *scp = DN_SK(sk);
char buf1[DN_ASCBUF_LEN];
char buf2[DN_ASCBUF_LEN];
char local_object[DN_MAXOBJL+3];
char remote_object[DN_MAXOBJL+3];
dn_printable_object(&scp->addr, local_object);
dn_printable_object(&scp->peer, remote_object);
seq_printf(seq,
"%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
"%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
scp->addrloc,
scp->numdat,
scp->numoth,
scp->ackxmt_dat,
scp->ackxmt_oth,
scp->flowloc_sw,
local_object,
dn_addr2asc(le16_to_cpu(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"));
}
static int dn_socket_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN) {
seq_puts(seq, "Local Remote\n");
} else {
dn_socket_format_entry(seq, v);
}
return 0;
}
static const struct seq_operations dn_socket_seq_ops = {
.start = dn_socket_seq_start,
.next = dn_socket_seq_next,
.stop = dn_socket_seq_stop,
.show = dn_socket_seq_show,
};
#endif
static const struct net_proto_family dn_family_ops = {
.family = AF_DECnet,
.create = dn_create,
.owner = THIS_MODULE,
};
static const struct proto_ops dn_proto_ops = {
.family = AF_DECnet,
.owner = THIS_MODULE,
.release = dn_release,
.bind = dn_bind,
.connect = dn_connect,
.socketpair = sock_no_socketpair,
.accept = dn_accept,
.getname = dn_getname,
.poll = dn_poll,
.ioctl = dn_ioctl,
.listen = dn_listen,
.shutdown = dn_shutdown,
.setsockopt = dn_setsockopt,
.getsockopt = dn_getsockopt,
.sendmsg = dn_sendmsg,
.recvmsg = dn_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
MODULE_AUTHOR("Linux DECnet Project Team");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_DECnet);
static const char banner[] __initconst = KERN_INFO
"NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
static int __init decnet_init(void)
{
int rc;
printk(banner);
rc = proto_register(&dn_proto, 1);
if (rc != 0)
goto out;
dn_neigh_init();
dn_dev_init();
dn_route_init();
dn_fib_init();
sock_register(&dn_family_ops);
dev_add_pack(&dn_dix_packet_type);
register_netdevice_notifier(&dn_dev_notifier);
proc_create_seq_private("decnet", 0444, init_net.proc_net,
&dn_socket_seq_ops, sizeof(struct dn_iter_state),
NULL);
dn_register_sysctl();
out:
return rc;
}
module_init(decnet_init);
/*
* Prevent DECnet module unloading until its fixed properly.
* Requires an audit of the code to check for memory leaks and
* initialisation problems etc.
*/
#if 0
static void __exit decnet_exit(void)
{
sock_unregister(AF_DECnet);
rtnl_unregister_all(PF_DECnet);
dev_remove_pack(&dn_dix_packet_type);
dn_unregister_sysctl();
unregister_netdevice_notifier(&dn_dev_notifier);
dn_route_cleanup();
dn_dev_cleanup();
dn_neigh_cleanup();
dn_fib_cleanup();
remove_proc_entry("decnet", init_net.proc_net);
proto_unregister(&dn_proto);
rcu_barrier(); /* Wait for completion of call_rcu()'s */
}
module_exit(decnet_exit);
#endif
View Git Blame Copy Permalink