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linux/net/decnet/af_decnet.c
Linus Torvalds e0c38a4d1f Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 
Pull networking updates from David Miller:

 1) New ipset extensions for matching on destination MAC addresses, from
    Stefano Brivio.

 2) Add ipv4 ttl and tos, plus ipv6 flow label and hop limit offloads to
    nfp driver. From Stefano Brivio.

 3) Implement GRO for plain UDP sockets, from Paolo Abeni.

 4) Lots of work from Michał Mirosław to eliminate the VLAN_TAG_PRESENT
    bit so that we could support the entire vlan_tci value.

 5) Rework the IPSEC policy lookups to better optimize more usecases,
    from Florian Westphal.

 6) Infrastructure changes eliminating direct manipulation of SKB lists
    wherever possible, and to always use the appropriate SKB list
    helpers. This work is still ongoing...

 7) Lots of PHY driver and state machine improvements and
    simplifications, from Heiner Kallweit.

 8) Various TSO deferral refinements, from Eric Dumazet.

 9) Add ntuple filter support to aquantia driver, from Dmitry Bogdanov.

10) Batch dropping of XDP packets in tuntap, from Jason Wang.

11) Lots of cleanups and improvements to the r8169 driver from Heiner
    Kallweit, including support for ->xmit_more. This driver has been
    getting some much needed love since he started working on it.

12) Lots of new forwarding selftests from Petr Machata.

13) Enable VXLAN learning in mlxsw driver, from Ido Schimmel.

14) Packed ring support for virtio, from Tiwei Bie.

15) Add new Aquantia AQtion USB driver, from Dmitry Bezrukov.

16) Add XDP support to dpaa2-eth driver, from Ioana Ciocoi Radulescu.

17) Implement coalescing on TCP backlog queue, from Eric Dumazet.

18) Implement carrier change in tun driver, from Nicolas Dichtel.

19) Support msg_zerocopy in UDP, from Willem de Bruijn.

20) Significantly improve garbage collection of neighbor objects when
    the table has many PERMANENT entries, from David Ahern.

21) Remove egdev usage from nfp and mlx5, and remove the facility
    completely from the tree as it no longer has any users. From Oz
    Shlomo and others.

22) Add a NETDEV_PRE_CHANGEADDR so that drivers can veto the change and
    therefore abort the operation before the commit phase (which is the
    NETDEV_CHANGEADDR event). From Petr Machata.

23) Add indirect call wrappers to avoid retpoline overhead, and use them
    in the GRO code paths. From Paolo Abeni.

24) Add support for netlink FDB get operations, from Roopa Prabhu.

25) Support bloom filter in mlxsw driver, from Nir Dotan.

26) Add SKB extension infrastructure. This consolidates the handling of
    the auxiliary SKB data used by IPSEC and bridge netfilter, and is
    designed to support the needs to MPTCP which could be integrated in
    the future.

27) Lots of XDP TX optimizations in mlx5 from Tariq Toukan.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1845 commits)
  net: dccp: fix kernel crash on module load
  drivers/net: appletalk/cops: remove redundant if statement and mask
  bnx2x: Fix NULL pointer dereference in bnx2x_del_all_vlans() on some hw
  net/net_namespace: Check the return value of register_pernet_subsys()
  net/netlink_compat: Fix a missing check of nla_parse_nested
  ieee802154: lowpan_header_create check must check daddr
  net/mlx4_core: drop useless LIST_HEAD
  mlxsw: spectrum: drop useless LIST_HEAD
  net/mlx5e: drop useless LIST_HEAD
  iptunnel: Set tun_flags in the iptunnel_metadata_reply from src
  net/mlx5e: fix semicolon.cocci warnings
  staging: octeon: fix build failure with XFRM enabled
  net: Revert recent Spectre-v1 patches.
  can: af_can: Fix Spectre v1 vulnerability
  packet: validate address length if non-zero
  nfc: af_nfc: Fix Spectre v1 vulnerability
  phonet: af_phonet: Fix Spectre v1 vulnerability
  net: core: Fix Spectre v1 vulnerability
  net: minor cleanup in skb_ext_add()
  net: drop the unused helper skb_ext_get()
  ...
2018-12-27 13:04:52 -08:00

2412 lines
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/*
* DECnet An implementation of the DECnet protocol suite for the LINUX
* operating system. DECnet is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* DECnet Socket Layer Interface
*
* Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
* Patrick Caulfield <patrick@pandh.demon.co.uk>
*
* Changes:
* Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
* version of the code. Original copyright preserved
* below.
* Steve Whitehouse: Some bug fixes, cleaning up some code to make it
* compatible with my routing layer.
* Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
* Caulfield.
* Steve Whitehouse: Further bug fixes, checking module code still works
* with new routing layer.
* Steve Whitehouse: Additional set/get_sockopt() calls.
* Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
* code.
* Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
* way. Didn't manage it entirely, but its better.
* Steve Whitehouse: ditto for sendmsg().
* Steve Whitehouse: A selection of bug fixes to various things.
* Steve Whitehouse: Added TIOCOUTQ ioctl.
* Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
* Steve Whitehouse: Fixes to connect() error returns.
* Patrick Caulfield: Fixes to delayed acceptance logic.
* David S. Miller: New socket locking
* Steve Whitehouse: Socket list hashing/locking
* Arnaldo C. Melo: use capable, not suser
* Steve Whitehouse: Removed unused code. Fix to use sk->allocation
* when required.
* Patrick Caulfield: /proc/net/decnet now has object name/number
* Steve Whitehouse: Fixed local port allocation, hashed sk list
* Matthew Wilcox: Fixes for dn_ioctl()
* Steve Whitehouse: New connect/accept logic to allow timeouts and
* prepare for sendpage etc.
*/
/******************************************************************************
(c) 1995-1998 E.M. Serrat emserrat@geocities.com
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/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_check(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->sk_ack_backlog--;
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(&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
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