![Xin Long](/assets/img/avatar_default.png)
As Eric noticed, in .sk_destruct, sk->sk_dst_cache update is prevented, and no barrier is needed for this. So change to use rcu_dereference_protected() instead of rcu_dereference_check() to fetch sk_dst_cache in there. v1->v2: - no change, repost after net-next is open. Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2412 lines
53 KiB
C
2412 lines
53 KiB
C
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/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet Socket Layer Interface
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*
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* Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
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* Patrick Caulfield <patrick@pandh.demon.co.uk>
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*
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* Changes:
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* Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
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* version of the code. Original copyright preserved
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* below.
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* Steve Whitehouse: Some bug fixes, cleaning up some code to make it
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* compatible with my routing layer.
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* Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
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* Caulfield.
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* Steve Whitehouse: Further bug fixes, checking module code still works
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* with new routing layer.
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* Steve Whitehouse: Additional set/get_sockopt() calls.
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* Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
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* code.
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* Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
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* way. Didn't manage it entirely, but its better.
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* Steve Whitehouse: ditto for sendmsg().
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* Steve Whitehouse: A selection of bug fixes to various things.
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* Steve Whitehouse: Added TIOCOUTQ ioctl.
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* Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
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* Steve Whitehouse: Fixes to connect() error returns.
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* Patrick Caulfield: Fixes to delayed acceptance logic.
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* David S. Miller: New socket locking
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* Steve Whitehouse: Socket list hashing/locking
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* Arnaldo C. Melo: use capable, not suser
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* Steve Whitehouse: Removed unused code. Fix to use sk->allocation
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* when required.
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* Patrick Caulfield: /proc/net/decnet now has object name/number
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* Steve Whitehouse: Fixed local port allocation, hashed sk list
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* Matthew Wilcox: Fixes for dn_ioctl()
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* Steve Whitehouse: New connect/accept logic to allow timeouts and
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* prepare for sendpage etc.
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*/
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/******************************************************************************
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(c) 1995-1998 E.M. Serrat emserrat@geocities.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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HISTORY:
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Version Kernel Date Author/Comments
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------- ------ ---- ---------------
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Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
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(emserrat@geocities.com)
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First Development of DECnet Socket La-
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yer for Linux. Only supports outgoing
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connections.
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Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
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(patrick@pandh.demon.co.uk)
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Port to new kernel development version.
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Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
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(emserrat@geocities.com)
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_
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Added support for incoming connections
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so we can start developing server apps
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on Linux.
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-
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Module Support
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Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
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(emserrat@geocities.com)
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_
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Added support for X11R6.4. Now we can
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use DECnet transport for X on Linux!!!
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-
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Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
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(emserrat@geocities.com)
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Removed bugs on flow control
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Removed bugs on incoming accessdata
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order
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-
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Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
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dn_recvmsg fixes
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Patrick J. Caulfield
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dn_bind fixes
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*******************************************************************************/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/inet.h>
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#include <linux/route.h>
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#include <linux/netfilter.h>
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#include <linux/seq_file.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <net/flow.h>
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#include <asm/ioctls.h>
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#include <linux/capability.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/jiffies.h>
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#include <net/net_namespace.h>
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#include <net/neighbour.h>
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#include <net/dst.h>
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#include <net/fib_rules.h>
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#include <net/tcp.h>
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#include <net/dn.h>
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#include <net/dn_nsp.h>
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#include <net/dn_dev.h>
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#include <net/dn_route.h>
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#include <net/dn_fib.h>
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#include <net/dn_neigh.h>
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struct dn_sock {
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struct sock sk;
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struct dn_scp scp;
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};
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static void dn_keepalive(struct sock *sk);
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#define DN_SK_HASH_SHIFT 8
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#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
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#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
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static const struct proto_ops dn_proto_ops;
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static DEFINE_RWLOCK(dn_hash_lock);
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static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
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static struct hlist_head dn_wild_sk;
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static atomic_long_t decnet_memory_allocated;
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static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
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static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
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static struct hlist_head *dn_find_list(struct sock *sk)
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{
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struct dn_scp *scp = DN_SK(sk);
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if (scp->addr.sdn_flags & SDF_WILD)
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return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
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return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
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}
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/*
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* Valid ports are those greater than zero and not already in use.
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*/
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static int check_port(__le16 port)
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{
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struct sock *sk;
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if (port == 0)
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return -1;
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sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
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struct dn_scp *scp = DN_SK(sk);
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if (scp->addrloc == port)
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return -1;
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}
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return 0;
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}
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static unsigned short port_alloc(struct sock *sk)
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{
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struct dn_scp *scp = DN_SK(sk);
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static unsigned short port = 0x2000;
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unsigned short i_port = port;
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while(check_port(cpu_to_le16(++port)) != 0) {
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if (port == i_port)
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return 0;
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}
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scp->addrloc = cpu_to_le16(port);
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return 1;
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}
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/*
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* Since this is only ever called from user
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* level, we don't need a write_lock() version
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* of this.
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*/
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static int dn_hash_sock(struct sock *sk)
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{
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struct dn_scp *scp = DN_SK(sk);
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struct hlist_head *list;
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int rv = -EUSERS;
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BUG_ON(sk_hashed(sk));
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write_lock_bh(&dn_hash_lock);
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if (!scp->addrloc && !port_alloc(sk))
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goto out;
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rv = -EADDRINUSE;
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if ((list = dn_find_list(sk)) == NULL)
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goto out;
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sk_add_node(sk, list);
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rv = 0;
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out:
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write_unlock_bh(&dn_hash_lock);
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return rv;
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}
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static void dn_unhash_sock(struct sock *sk)
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{
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write_lock(&dn_hash_lock);
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sk_del_node_init(sk);
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write_unlock(&dn_hash_lock);
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}
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static void dn_unhash_sock_bh(struct sock *sk)
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{
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write_lock_bh(&dn_hash_lock);
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sk_del_node_init(sk);
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write_unlock_bh(&dn_hash_lock);
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}
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static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
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{
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int i;
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unsigned int hash = addr->sdn_objnum;
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if (hash == 0) {
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hash = addr->sdn_objnamel;
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for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
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hash ^= addr->sdn_objname[i];
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hash ^= (hash << 3);
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}
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}
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return &dn_sk_hash[hash & DN_SK_HASH_MASK];
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}
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/*
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* Called to transform a socket from bound (i.e. with a local address)
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* into a listening socket (doesn't need a local port number) and rehashes
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* based upon the object name/number.
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*/
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static void dn_rehash_sock(struct sock *sk)
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{
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struct hlist_head *list;
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struct dn_scp *scp = DN_SK(sk);
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if (scp->addr.sdn_flags & SDF_WILD)
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return;
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write_lock_bh(&dn_hash_lock);
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sk_del_node_init(sk);
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DN_SK(sk)->addrloc = 0;
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list = listen_hash(&DN_SK(sk)->addr);
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sk_add_node(sk, list);
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write_unlock_bh(&dn_hash_lock);
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}
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int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
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{
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int len = 2;
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*buf++ = type;
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switch (type) {
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case 0:
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*buf++ = sdn->sdn_objnum;
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break;
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case 1:
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*buf++ = 0;
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*buf++ = le16_to_cpu(sdn->sdn_objnamel);
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memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
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len = 3 + le16_to_cpu(sdn->sdn_objnamel);
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break;
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case 2:
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memset(buf, 0, 5);
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buf += 5;
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*buf++ = le16_to_cpu(sdn->sdn_objnamel);
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memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
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len = 7 + le16_to_cpu(sdn->sdn_objnamel);
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break;
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}
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return len;
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}
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/*
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* On reception of usernames, we handle types 1 and 0 for destination
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* addresses only. Types 2 and 4 are used for source addresses, but the
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* UIC, GIC are ignored and they are both treated the same way. Type 3
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* is never used as I've no idea what its purpose might be or what its
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* format is.
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*/
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int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
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{
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unsigned char type;
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int size = len;
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int namel = 12;
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sdn->sdn_objnum = 0;
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sdn->sdn_objnamel = cpu_to_le16(0);
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memset(sdn->sdn_objname, 0, DN_MAXOBJL);
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if (len < 2)
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return -1;
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len -= 2;
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*fmt = *data++;
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type = *data++;
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switch (*fmt) {
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case 0:
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sdn->sdn_objnum = type;
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return 2;
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case 1:
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namel = 16;
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break;
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case 2:
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len -= 4;
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data += 4;
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break;
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case 4:
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len -= 8;
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data += 8;
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break;
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default:
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return -1;
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}
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len -= 1;
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if (len < 0)
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return -1;
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sdn->sdn_objnamel = cpu_to_le16(*data++);
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len -= le16_to_cpu(sdn->sdn_objnamel);
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if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
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return -1;
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memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
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return size - len;
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}
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struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
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{
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struct hlist_head *list = listen_hash(addr);
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struct sock *sk;
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|
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read_lock(&dn_hash_lock);
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sk_for_each(sk, list) {
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struct dn_scp *scp = DN_SK(sk);
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if (sk->sk_state != TCP_LISTEN)
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continue;
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if (scp->addr.sdn_objnum) {
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if (scp->addr.sdn_objnum != addr->sdn_objnum)
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continue;
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} else {
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if (addr->sdn_objnum)
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continue;
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if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
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continue;
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if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
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continue;
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}
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sock_hold(sk);
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read_unlock(&dn_hash_lock);
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return sk;
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}
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|
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sk = sk_head(&dn_wild_sk);
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if (sk) {
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if (sk->sk_state == TCP_LISTEN)
|
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sock_hold(sk);
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else
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sk = NULL;
|
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}
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|
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read_unlock(&dn_hash_lock);
|
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return sk;
|
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}
|
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|
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struct sock *dn_find_by_skb(struct sk_buff *skb)
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{
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struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
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struct sock *sk;
|
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struct dn_scp *scp;
|
|
|
|
read_lock(&dn_hash_lock);
|
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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))
|
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continue;
|
|
if (cb->dst_port != scp->addrloc)
|
|
continue;
|
|
if (scp->addrrem && (cb->src_port != scp->addrrem))
|
|
continue;
|
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sock_hold(sk);
|
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goto found;
|
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}
|
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sk = NULL;
|
|
found:
|
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read_unlock(&dn_hash_lock);
|
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return sk;
|
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}
|
|
|
|
|
|
|
|
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));
|
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}
|
|
|
|
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
|