af_decnet.c
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上传日期:2013-02-24
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- /*
- * DECnet An implementation of the DECnet protocol suite for the LINUX
- * operating system. DECnet is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * DECnet Socket Layer Interface
- *
- * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
- * Patrick Caulfield <patrick@pandh.demon.co.uk>
- *
- * Changes:
- * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
- * version of the code. Original copyright preserved
- * below.
- * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
- * compatible with my routing layer.
- * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
- * Caulfield.
- * Steve Whitehouse: Further bug fixes, checking module code still works
- * with new routing layer.
- * Steve Whitehouse: Additional set/get_sockopt() calls.
- * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
- * code.
- * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
- * way. Didn't manage it entirely, but its better.
- * Steve Whitehouse: ditto for sendmsg().
- * Steve Whitehouse: A selection of bug fixes to various things.
- * Steve Whitehouse: Added TIOCOUTQ ioctl.
- * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
- * Steve Whitehouse: Fixes to connect() error returns.
- * Patrick Caulfield: Fixes to delayed acceptance logic.
- * David S. Miller: New socket locking
- * Steve Whitehouse: Socket list hashing/locking
- * Arnaldo C. Melo: use capable, not suser
- * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
- * when required.
- * Patrick Caulfield: /proc/net/decnet now has object name/number
- * Steve Whitehouse: Fixed local port allocation, hashed sk list
- */
- /******************************************************************************
- (c) 1995-1998 E.M. Serrat emserrat@geocities.com
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- HISTORY:
- Version Kernel Date Author/Comments
- ------- ------ ---- ---------------
- Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
- (emserrat@geocities.com)
- First Development of DECnet Socket La-
- yer for Linux. Only supports outgoing
- connections.
- Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
- (patrick@pandh.demon.co.uk)
- Port to new kernel development version.
- Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
- (emserrat@geocities.com)
- _
- Added support for incoming connections
- so we can start developing server apps
- on Linux.
- -
- Module Support
- Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
- (emserrat@geocities.com)
- _
- Added support for X11R6.4. Now we can
- use DECnet transport for X on Linux!!!
- -
- Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
- (emserrat@geocities.com)
- Removed bugs on flow control
- Removed bugs on incoming accessdata
- order
- -
- Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
- dn_recvmsg fixes
- Patrick J. Caulfield
- dn_bind fixes
- *******************************************************************************/
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <linux/netdevice.h>
- #include <linux/inet.h>
- #include <linux/route.h>
- #include <linux/netfilter.h>
- #include <net/sock.h>
- #include <asm/segment.h>
- #include <asm/system.h>
- #include <asm/ioctls.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/init.h>
- #include <linux/poll.h>
- #include <net/neighbour.h>
- #include <net/dst.h>
- #include <net/dn.h>
- #include <net/dn_nsp.h>
- #include <net/dn_dev.h>
- #include <net/dn_route.h>
- #include <net/dn_fib.h>
- #include <net/dn_neigh.h>
- static void dn_keepalive(struct sock *sk);
- /*
- * decnet_address is kept in network order, decnet_ether_address is kept
- * as a string of bytes.
- */
- dn_address decnet_address = 0;
- unsigned char decnet_ether_address[ETH_ALEN] = { 0xAA, 0x00, 0x04, 0x00, 0x00, 0x00 };
- #define DN_SK_HASH_SHIFT 8
- #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
- #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
- static struct proto_ops dn_proto_ops;
- rwlock_t dn_hash_lock = RW_LOCK_UNLOCKED;
- static struct sock *dn_sk_hash[DN_SK_HASH_SIZE];
- static struct sock *dn_wild_sk;
- static int __dn_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen, int flags);
- static int __dn_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen, int flags);
- static struct sock **dn_find_list(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- if (scp->addr.sdn_flags & SDF_WILD)
- return dn_wild_sk ? NULL : &dn_wild_sk;
- return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
- }
- /*
- * Valid ports are those greater than zero and not already in use.
- */
- static int check_port(unsigned short port)
- {
- struct sock *sk = dn_sk_hash[port & DN_SK_HASH_MASK];
- if (port == 0)
- return -1;
- while(sk) {
- struct dn_scp *scp = DN_SK(sk);
- if (scp->addrloc == port)
- return -1;
- sk = sk->next;
- }
- return 0;
- }
- static unsigned short port_alloc(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- static unsigned short port = 0x2000;
- unsigned short i_port = port;
- while(check_port(++port) != 0) {
- if (port == i_port)
- return 0;
- }
- scp->addrloc = port;
- return 1;
- }
- /*
- * Since this is only ever called from user
- * level, we don't need a write_lock() version
- * of this.
- */
- static int dn_hash_sock(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- struct sock **skp;
- int rv = -EUSERS;
- if (sk->next)
- BUG();
- if (sk->pprev)
- BUG();
- write_lock_bh(&dn_hash_lock);
-
- if (!scp->addrloc && !port_alloc(sk))
- goto out;
- rv = -EADDRINUSE;
- if ((skp = dn_find_list(sk)) == NULL)
- goto out;
- sk->next = *skp;
- sk->pprev = skp;
- *skp = sk;
- rv = 0;
- out:
- write_unlock_bh(&dn_hash_lock);
- return rv;
- }
- static void dn_unhash_sock(struct sock *sk)
- {
- struct sock **skp = sk->pprev;
- if (skp == NULL)
- return;
- write_lock(&dn_hash_lock);
- while(*skp != sk)
- skp = &((*skp)->next);
- *skp = sk->next;
- write_unlock(&dn_hash_lock);
- sk->next = NULL;
- sk->pprev = NULL;
- }
- static void dn_unhash_sock_bh(struct sock *sk)
- {
- struct sock **skp = sk->pprev;
- if (skp == NULL)
- return;
- write_lock_bh(&dn_hash_lock);
- while(*skp != sk)
- skp = &((*skp)->next);
- *skp = sk->next;
- write_unlock_bh(&dn_hash_lock);
- sk->next = NULL;
- sk->pprev = NULL;
- }
- struct sock **listen_hash(struct sockaddr_dn *addr)
- {
- int i;
- unsigned hash = addr->sdn_objnum;
- if (hash == 0) {
- hash = addr->sdn_objnamel;
- for(i = 0; i < addr->sdn_objnamel; i++) {
- hash ^= addr->sdn_objname[i];
- hash ^= (hash << 3);
- }
- }
- return &dn_sk_hash[hash & DN_SK_HASH_MASK];
- }
- /*
- * Called to transform a socket from bound (i.e. with a local address)
- * into a listening socket (doesn't need a local port number) and rehashes
- * based upon the object name/number.
- */
- static void dn_rehash_sock(struct sock *sk)
- {
- struct sock **skp = sk->pprev;
- struct dn_scp *scp = DN_SK(sk);
- if (scp->addr.sdn_flags & SDF_WILD)
- return;
- write_lock_bh(&dn_hash_lock);
- while(*skp != sk)
- skp = &((*skp)->next);
- *skp = sk->next;
- DN_SK(sk)->addrloc = 0;
- skp = listen_hash(&DN_SK(sk)->addr);
- sk->next = *skp;
- sk->pprev = skp;
- *skp = sk;
- write_unlock_bh(&dn_hash_lock);
- }
- int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
- {
- int len = 2;
- *buf++ = type;
- switch(type) {
- case 0:
- *buf++ = sdn->sdn_objnum;
- break;
- case 1:
- *buf++ = 0;
- *buf++ = dn_ntohs(sdn->sdn_objnamel);
- memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
- len = 3 + dn_ntohs(sdn->sdn_objnamel);
- break;
- case 2:
- memset(buf, 0, 5);
- buf += 5;
- *buf++ = dn_ntohs(sdn->sdn_objnamel);
- memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
- len = 7 + dn_ntohs(sdn->sdn_objnamel);
- break;
- }
- return len;
- }
- /*
- * On reception of usernames, we handle types 1 and 0 for destination
- * addresses only. Types 2 and 4 are used for source addresses, but the
- * UIC, GIC are ignored and they are both treated the same way. Type 3
- * is never used as I've no idea what its purpose might be or what its
- * format is.
- */
- int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
- {
- unsigned char type;
- int size = len;
- int namel = 12;
- sdn->sdn_objnum = 0;
- sdn->sdn_objnamel = dn_htons(0);
- memset(sdn->sdn_objname, 0, DN_MAXOBJL);
- if (len < 2)
- return -1;
- len -= 2;
- *fmt = *data++;
- type = *data++;
- switch(*fmt) {
- case 0:
- sdn->sdn_objnum = type;
- return 2;
- case 1:
- namel = 16;
- break;
- case 2:
- len -= 4;
- data += 4;
- break;
- case 4:
- len -= 8;
- data += 8;
- break;
- default:
- return -1;
- }
- len -= 1;
- if (len < 0)
- return -1;
- sdn->sdn_objnamel = dn_htons(*data++);
- len -= dn_ntohs(sdn->sdn_objnamel);
- if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
- return -1;
- memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
- return size - len;
- }
- struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
- {
- struct sock **skp = listen_hash(addr);
- struct sock *sk;
- read_lock(&dn_hash_lock);
- for(sk = *skp; sk != NULL; sk = sk->next) {
- struct dn_scp *scp = DN_SK(sk);
- if (sk->state != TCP_LISTEN)
- continue;
- if (scp->addr.sdn_objnum) {
- if (scp->addr.sdn_objnum != addr->sdn_objnum)
- continue;
- } else {
- if (addr->sdn_objnum)
- continue;
- if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
- continue;
- if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
- continue;
- }
- sock_hold(sk);
- read_unlock(&dn_hash_lock);
- return sk;
- }
- if (dn_wild_sk && (dn_wild_sk->state == TCP_LISTEN))
- sock_hold((sk = dn_wild_sk));
- read_unlock(&dn_hash_lock);
- return sk;
- }
- struct sock *dn_find_by_skb(struct sk_buff *skb)
- {
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- struct sock *sk;
- struct dn_scp *scp;
- read_lock(&dn_hash_lock);
- sk = dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK];
- for (; sk != NULL; sk = sk->next) {
- scp = DN_SK(sk);
- if (cb->src != dn_saddr2dn(&scp->peer))
- continue;
- if (cb->dst_port != scp->addrloc)
- continue;
- if (scp->addrrem && (cb->src_port != scp->addrrem))
- continue;
- break;
- }
- if (sk)
- sock_hold(sk);
- read_unlock(&dn_hash_lock);
- return sk;
- }
- static void dn_destruct(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- skb_queue_purge(&scp->data_xmit_queue);
- skb_queue_purge(&scp->other_xmit_queue);
- skb_queue_purge(&scp->other_receive_queue);
- dst_release(xchg(&sk->dst_cache, NULL));
- MOD_DEC_USE_COUNT;
- }
- struct sock *dn_alloc_sock(struct socket *sock, int gfp)
- {
- struct sock *sk;
- struct dn_scp *scp;
- if ((sk = sk_alloc(PF_DECnet, gfp, 1)) == NULL)
- goto no_sock;
- if (sock) {
- sock->ops = &dn_proto_ops;
- }
- sock_init_data(sock,sk);
- scp = DN_SK(sk);
- sk->backlog_rcv = dn_nsp_backlog_rcv;
- sk->destruct = dn_destruct;
- sk->no_check = 1;
- sk->family = PF_DECnet;
- sk->protocol = 0;
- sk->allocation = gfp;
- /* Initialization of DECnet Session Control Port */
- scp->state = DN_O; /* Open */
- scp->numdat = 1; /* Next data seg to tx */
- scp->numoth = 1; /* Next oth data to tx */
- scp->ackxmt_dat = 0; /* Last data seg ack'ed */
- scp->ackxmt_oth = 0; /* Last oth data ack'ed */
- scp->ackrcv_dat = 0; /* Highest data ack recv*/
- scp->ackrcv_oth = 0; /* Last oth data ack rec*/
- scp->flowrem_sw = DN_SEND;
- scp->flowloc_sw = DN_SEND;
- scp->flowrem_dat = 0;
- scp->flowrem_oth = 1;
- scp->flowloc_dat = 0;
- scp->flowloc_oth = 1;
- scp->services_rem = 0;
- scp->services_loc = 1 | NSP_FC_NONE;
- scp->info_rem = 0;
- scp->info_loc = 0x03; /* NSP version 4.1 */
- scp->segsize_rem = 230; /* Default: Updated by remote segsize */
- scp->segsize_loc = 1450; /* Best guess for ethernet */
- scp->nonagle = 0;
- scp->multi_ireq = 1;
- scp->accept_mode = ACC_IMMED;
- scp->addr.sdn_family = AF_DECnet;
- scp->peer.sdn_family = AF_DECnet;
- scp->accessdata.acc_accl = 5;
- memcpy(scp->accessdata.acc_acc, "LINUX", 5);
- scp->max_window = NSP_MAX_WINDOW;
- scp->snd_window = NSP_MIN_WINDOW;
- scp->nsp_srtt = NSP_INITIAL_SRTT;
- scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
- scp->nsp_rxtshift = 0;
- skb_queue_head_init(&scp->data_xmit_queue);
- skb_queue_head_init(&scp->other_xmit_queue);
- skb_queue_head_init(&scp->other_receive_queue);
- scp->persist = 0;
- scp->persist_fxn = NULL;
- scp->keepalive = 10 * HZ;
- scp->keepalive_fxn = dn_keepalive;
- init_timer(&scp->delack_timer);
- scp->delack_pending = 0;
- scp->delack_fxn = dn_nsp_delayed_ack;
- dn_start_slow_timer(sk);
- MOD_INC_USE_COUNT;
- return sk;
- no_sock:
- return NULL;
- }
- /*
- * Keepalive timer.
- * FIXME: Should respond to SO_KEEPALIVE etc.
- */
- static void dn_keepalive(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- /*
- * By checking the other_data transmit queue is empty
- * we are double checking that we are not sending too
- * many of these keepalive frames.
- */
- if (skb_queue_len(&scp->other_xmit_queue) == 0)
- dn_nsp_send_link(sk, DN_NOCHANGE, 0);
- }
- /*
- * Timer for shutdown/destroyed sockets.
- * When socket is dead & no packets have been sent for a
- * certain amount of time, they are removed by this
- * routine. Also takes care of sending out DI & DC
- * frames at correct times.
- */
- int dn_destroy_timer(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- scp->persist = dn_nsp_persist(sk);
- switch(scp->state) {
- case DN_DI:
- dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
- if (scp->nsp_rxtshift >= decnet_di_count)
- scp->state = DN_CN;
- return 0;
- case DN_DR:
- dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
- if (scp->nsp_rxtshift >= decnet_dr_count)
- scp->state = DN_DRC;
- return 0;
- case DN_DN:
- if (scp->nsp_rxtshift < decnet_dn_count) {
- /* printk(KERN_DEBUG "dn_destroy_timer: DNn"); */
- dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
- return 0;
- }
- }
- scp->persist = (HZ * decnet_time_wait);
- if (sk->socket)
- return 0;
- dn_stop_fast_timer(sk); /* unlikely, but possible that this is runninng */
- if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
- dn_unhash_sock(sk);
- sock_put(sk);
- return 1;
- }
- return 0;
- }
- static void dn_destroy_sock(struct sock *sk)
- {
- struct dn_scp *scp = DN_SK(sk);
- scp->nsp_rxtshift = 0; /* reset back off */
- if (sk->socket) {
- if (sk->socket->state != SS_UNCONNECTED)
- sk->socket->state = SS_DISCONNECTING;
- }
- sk->state = TCP_CLOSE;
- switch(scp->state) {
- case DN_DN:
- dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, sk->allocation);
- scp->persist_fxn = dn_destroy_timer;
- scp->persist = dn_nsp_persist(sk);
- break;
- case DN_CR:
- scp->state = DN_DR;
- goto disc_reject;
- case DN_RUN:
- scp->state = DN_DI;
- case DN_DI:
- case DN_DR:
- disc_reject:
- dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->allocation);
- case DN_NC:
- case DN_NR:
- case DN_RJ:
- case DN_DIC:
- case DN_CN:
- case DN_DRC:
- case DN_CI:
- case DN_CD:
- scp->persist_fxn = dn_destroy_timer;
- scp->persist = dn_nsp_persist(sk);
- break;
- default:
- printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid staten");
- case DN_O:
- dn_stop_fast_timer(sk);
- dn_stop_slow_timer(sk);
- dn_unhash_sock_bh(sk);
- sock_put(sk);
- break;
- }
- }
- char *dn_addr2asc(dn_address addr, char *buf)
- {
- unsigned short node, area;
- node = addr & 0x03ff;
- area = addr >> 10;
- sprintf(buf, "%hd.%hd", area, node);
- return buf;
- }
- static char *dn_state2asc(unsigned char state)
- {
- switch(state) {
- case DN_O:
- return "OPEN";
- case DN_CR:
- return " CR";
- case DN_DR:
- return " DR";
- case DN_DRC:
- return " DRC";
- case DN_CC:
- return " CC";
- case DN_CI:
- return " CI";
- case DN_NR:
- return " NR";
- case DN_NC:
- return " NC";
- case DN_CD:
- return " CD";
- case DN_RJ:
- return " RJ";
- case DN_RUN:
- return " RUN";
- case DN_DI:
- return " DI";
- case DN_DIC:
- return " DIC";
- case DN_DN:
- return " DN";
- case DN_CL:
- return " CL";
- case DN_CN:
- return " CN";
- }
- return "????";
- }
- static int dn_create(struct socket *sock, int protocol)
- {
- struct sock *sk;
- switch(sock->type) {
- case SOCK_SEQPACKET:
- if (protocol != DNPROTO_NSP)
- return -EPROTONOSUPPORT;
- break;
- case SOCK_STREAM:
- break;
- default:
- return -ESOCKTNOSUPPORT;
- }
- if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
- return -ENOBUFS;
- sk->protocol = protocol;
- return 0;
- }
- static int
- dn_release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- if (sk) {
- sock_orphan(sk);
- sock_hold(sk);
- lock_sock(sk);
- dn_destroy_sock(sk);
- release_sock(sk);
- sock_put(sk);
- }
- return 0;
- }
- static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
- struct net_device *dev;
- int rv;
- if (sk->zapped == 0)
- return -EINVAL;
- if (addr_len != sizeof(struct sockaddr_dn))
- return -EINVAL;
- if (saddr->sdn_family != AF_DECnet)
- return -EINVAL;
- if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
- return -EINVAL;
- if (saddr->sdn_objnum && !capable(CAP_NET_BIND_SERVICE))
- return -EPERM;
- if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
- return -EINVAL;
- if (saddr->sdn_flags & ~SDF_WILD)
- return -EINVAL;
- if (saddr->sdn_flags & SDF_WILD) {
- if (!capable(CAP_NET_BIND_SERVICE))
- return -EPERM;
- } else {
- if (dn_ntohs(saddr->sdn_nodeaddrl)) {
- read_lock(&dev_base_lock);
- for(dev = dev_base; dev; dev = dev->next) {
- if (!dev->dn_ptr)
- continue;
- if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
- break;
- }
- read_unlock(&dev_base_lock);
- if (dev == NULL)
- return -EADDRNOTAVAIL;
- }
- }
- memcpy(&scp->addr, saddr, addr_len);
- sk->zapped = 0;
- if ((rv = dn_hash_sock(sk)) != 0)
- sk->zapped = 1;
- return rv;
- }
- static int dn_auto_bind(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- sk->zapped = 0;
- scp->addr.sdn_flags = 0;
- scp->addr.sdn_objnum = 0;
- /*
- * This stuff is to keep compatibility with Eduardo's
- * patch. I hope I can dispense with it shortly...
- */
- if ((scp->accessdata.acc_accl != 0) &&
- (scp->accessdata.acc_accl <= 12)) {
-
- scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
- memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
- scp->accessdata.acc_accl = 0;
- memset(scp->accessdata.acc_acc, 0, 40);
- }
- scp->addr.sdn_add.a_len = dn_htons(2);
- *(dn_address *)scp->addr.sdn_add.a_addr = decnet_address;
- dn_hash_sock(sk);
- return 0;
- }
- static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
- {
- struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- int err = -EISCONN;
- lock_sock(sk);
- if (sock->state == SS_CONNECTED)
- goto out;
- if (sock->state == SS_CONNECTING) {
- err = 0;
- if (sk->state == TCP_ESTABLISHED)
- goto out;
- err = -ECONNREFUSED;
- if (sk->state == TCP_CLOSE)
- goto out;
- }
- err = -EINVAL;
- if (DN_SK(sk)->state != DN_O)
- goto out;
- if (addr_len != sizeof(struct sockaddr_dn))
- goto out;
- if (addr->sdn_family != AF_DECnet)
- goto out;
- if (addr->sdn_flags & SDF_WILD)
- goto out;
- err = -EADDRNOTAVAIL;
- if (sk->zapped && (err = dn_auto_bind(sock)))
- goto out;
- memcpy(&scp->peer, addr, addr_len);
- err = -EHOSTUNREACH;
- if (dn_route_output(&sk->dst_cache, dn_saddr2dn(&scp->peer), dn_saddr2dn(&scp->addr), 0) < 0)
- goto out;
- sk->state = TCP_SYN_SENT;
- sock->state = SS_CONNECTING;
- DN_SK(sk)->state = DN_CI;
- dn_nsp_send_conninit(sk, NSP_CI);
- err = -EINPROGRESS;
- if ((sk->state == TCP_SYN_SENT) && (flags & O_NONBLOCK))
- goto out;
- while(sk->state == TCP_SYN_SENT) {
- err = -ERESTARTSYS;
- if (signal_pending(current))
- goto out;
- if ((err = sock_error(sk)) != 0) {
- sock->state = SS_UNCONNECTED;
- goto out;
- }
- SOCK_SLEEP_PRE(sk);
- if (sk->state == TCP_SYN_SENT)
- schedule();
- SOCK_SLEEP_POST(sk);
- }
- if (sk->state != TCP_ESTABLISHED) {
- sock->state = SS_UNCONNECTED;
- err = sock_error(sk);
- goto out;
- }
- err = 0;
- sock->state = SS_CONNECTED;
- out:
- release_sock(sk);
- return err;
- }
- static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
- {
- unsigned char *ptr = skb->data;
- acc->acc_userl = *ptr++;
- memcpy(&acc->acc_user, ptr, acc->acc_userl);
- ptr += acc->acc_userl;
- acc->acc_passl = *ptr++;
- memcpy(&acc->acc_pass, ptr, acc->acc_passl);
- ptr += acc->acc_passl;
- acc->acc_accl = *ptr++;
- memcpy(&acc->acc_acc, ptr, acc->acc_accl);
- skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
- }
- static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
- {
- unsigned char *ptr = skb->data;
-
- opt->opt_optl = *ptr++;
- opt->opt_status = 0;
- memcpy(opt->opt_data, ptr, opt->opt_optl);
- skb_pull(skb, opt->opt_optl + 1);
- }
- /*
- * This is here for use in the sockopt() call as well as
- * in accept(). Must be called with a locked socket.
- */
- static int dn_wait_accept(struct socket *sock, int flags)
- {
- struct sock *sk = sock->sk;
- while(sk->state == TCP_LISTEN) {
- if (flags & O_NONBLOCK) {
- return -EAGAIN;
- }
- SOCK_SLEEP_PRE(sk)
- if (sk->state == TCP_LISTEN)
- schedule();
- SOCK_SLEEP_POST(sk)
- if (signal_pending(current))
- return -ERESTARTSYS; /* But of course you don't! */
- }
- if ((DN_SK(sk)->state != DN_RUN) && (DN_SK(sk)->state != DN_DRC)) {
- sock->state = SS_UNCONNECTED;
- return sock_error(sk);
- }
- sock->state = SS_CONNECTED;
- return 0;
- }
- static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
- {
- struct sock *sk = sock->sk, *newsk;
- struct sk_buff *skb = NULL;
- struct dn_skb_cb *cb;
- unsigned char menuver;
- int err = 0;
- unsigned char type;
- lock_sock(sk);
- if (sk->state != TCP_LISTEN) {
- release_sock(sk);
- return -EINVAL;
- }
- if (DN_SK(sk)->state != DN_O) {
- release_sock(sk);
- return -EINVAL;
- }
- do
- {
- if ((skb = skb_dequeue(&sk->receive_queue)) == NULL)
- {
- if (flags & O_NONBLOCK)
- {
- release_sock(sk);
- return -EAGAIN;
- }
- SOCK_SLEEP_PRE(sk);
- if (!skb_peek(&sk->receive_queue))
- schedule();
- SOCK_SLEEP_POST(sk);
- if (signal_pending(current))
- {
- release_sock(sk);
- return -ERESTARTSYS;
- }
- }
- } while (skb == NULL);
- cb = DN_SKB_CB(skb);
- if ((newsk = dn_alloc_sock(newsock, sk->allocation)) == NULL) {
- release_sock(sk);
- kfree_skb(skb);
- return -ENOBUFS;
- }
- sk->ack_backlog--;
- release_sock(sk);
- dst_release(xchg(&newsk->dst_cache, skb->dst));
- skb->dst = NULL;
- DN_SK(newsk)->state = DN_CR;
- DN_SK(newsk)->addrrem = cb->src_port;
- DN_SK(newsk)->services_rem = cb->services;
- DN_SK(newsk)->info_rem = cb->info;
- DN_SK(newsk)->segsize_rem = cb->segsize;
- DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
-
- if (DN_SK(newsk)->segsize_rem < 230)
- DN_SK(newsk)->segsize_rem = 230;
- if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
- DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
- newsk->state = TCP_LISTEN;
- newsk->zapped = 0;
- memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
- /*
- * If we are listening on a wild socket, we don't want
- * the newly created socket on the wrong hash queue.
- */
- DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
- skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
- skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
- *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
- *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
- menuver = *skb->data;
- skb_pull(skb, 1);
- if (menuver & DN_MENUVER_ACC)
- dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
- if (menuver & DN_MENUVER_USR)
- dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
- if (menuver & DN_MENUVER_PRX)
- DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
- if (menuver & DN_MENUVER_UIC)
- DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
- kfree_skb(skb);
- memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
- sizeof(struct optdata_dn));
- memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
- sizeof(struct optdata_dn));
- lock_sock(newsk);
- /*
- * FIXME: This can fail if we've run out of local ports....
- */
- dn_hash_sock(newsk);
- dn_send_conn_ack(newsk);
- /*
- * Here we use sk->allocation since although the conn conf is
- * for the newsk, the context is the old socket.
- */
- if (DN_SK(newsk)->accept_mode == ACC_IMMED) {
- DN_SK(newsk)->state = DN_CC;
- dn_send_conn_conf(newsk, sk->allocation);
- err = dn_wait_accept(newsock, flags);
- }
- release_sock(newsk);
- return err;
- }
- static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
- {
- struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- *uaddr_len = sizeof(struct sockaddr_dn);
- lock_sock(sk);
- if (peer) {
- if ((sock->state != SS_CONNECTED &&
- sock->state != SS_CONNECTING) &&
- scp->accept_mode == ACC_IMMED)
- return -ENOTCONN;
- memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
- } else {
- memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
- }
- release_sock(sk);
- return 0;
- }
- static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- int mask = datagram_poll(file, sock, wait);
- if (skb_queue_len(&scp->other_receive_queue))
- mask |= POLLRDBAND;
- return mask;
- }
- static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- int err = -EOPNOTSUPP;
- unsigned long amount = 0;
- struct sk_buff *skb;
- int val;
- switch(cmd)
- {
- case SIOCGIFADDR:
- case SIOCSIFADDR:
- return dn_dev_ioctl(cmd, (void *)arg);
- case SIOCATMARK:
- lock_sock(sk);
- val = (skb_queue_len(&scp->other_receive_queue) != 0);
- if (scp->state != DN_RUN)
- val = -ENOTCONN;
- release_sock(sk);
- return val;
- #ifdef CONFIG_DECNET_ROUTER
- case SIOCADDRT:
- case SIOCDELRT:
- return dn_fib_ioctl(sock, cmd, arg);
- #endif /* CONFIG_DECNET_ROUTER */
- case OSIOCSNETADDR:
- if (!capable(CAP_NET_ADMIN)) {
- err = -EPERM;
- break;
- }
- dn_dev_devices_off();
- decnet_address = (unsigned short)arg;
- dn_dn2eth(decnet_ether_address, dn_ntohs(decnet_address));
- dn_dev_devices_on();
- err = 0;
- break;
- case OSIOCGNETADDR:
- err = put_user(decnet_address, (unsigned short *)arg);
- break;
- case SIOCGIFCONF:
- case SIOCGIFFLAGS:
- case SIOCGIFBRDADDR:
- return dev_ioctl(cmd,(void *)arg);
- case TIOCOUTQ:
- amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
- if (amount < 0)
- amount = 0;
- err = put_user(amount, (int *)arg);
- break;
- case TIOCINQ:
- lock_sock(sk);
- if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
- amount = skb->len;
- } else {
- struct sk_buff *skb = sk->receive_queue.next;
- for(;;) {
- if (skb == (struct sk_buff *)&sk->receive_queue)
- break;
- amount += skb->len;
- skb = skb->next;
- }
- }
- release_sock(sk);
- err = put_user(amount, (int *)arg);
- break;
- }
- return err;
- }
- static int dn_listen(struct socket *sock, int backlog)
- {
- struct sock *sk = sock->sk;
- int err = -EINVAL;
- lock_sock(sk);
- if (sk->zapped)
- goto out;
- if ((DN_SK(sk)->state != DN_O) || (sk->state == TCP_LISTEN))
- goto out;
- sk->max_ack_backlog = backlog;
- sk->ack_backlog = 0;
- sk->state = TCP_LISTEN;
- err = 0;
- dn_rehash_sock(sk);
- out:
- release_sock(sk);
- return err;
- }
- static int dn_shutdown(struct socket *sock, int how)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- int err = -ENOTCONN;
- lock_sock(sk);
- if (sock->state == SS_UNCONNECTED)
- goto out;
- err = 0;
- if (sock->state == SS_DISCONNECTING)
- goto out;
- err = -EINVAL;
- if (scp->state == DN_O)
- goto out;
- if (how != SHUTDOWN_MASK)
- goto out;
- sk->shutdown = how;
- dn_destroy_sock(sk);
- err = 0;
- out:
- release_sock(sk);
- return err;
- }
- static int dn_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen)
- {
- struct sock *sk = sock->sk;
- int err;
- lock_sock(sk);
- err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
- release_sock(sk);
- return err;
- }
- static int __dn_setsockopt(struct socket *sock, int level,int optname, char *optval, int optlen, int flags)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- union {
- struct optdata_dn opt;
- struct accessdata_dn acc;
- int mode;
- unsigned long win;
- int val;
- unsigned char services;
- unsigned char info;
- } u;
- int err;
- if (optlen && !optval)
- return -EINVAL;
- if (optlen > sizeof(u))
- return -EINVAL;
- if (copy_from_user(&u, optval, optlen))
- return -EFAULT;
- switch(optname) {
- case DSO_CONDATA:
- if (sock->state == SS_CONNECTED)
- return -EISCONN;
- if ((scp->state != DN_O) && (scp->state != DN_CR))
- return -EINVAL;
- if (optlen != sizeof(struct optdata_dn))
- return -EINVAL;
- if (u.opt.opt_optl > 16)
- return -EINVAL;
- memcpy(&scp->conndata_out, &u.opt, optlen);
- break;
- case DSO_DISDATA:
- if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
- return -ENOTCONN;
- if (optlen != sizeof(struct optdata_dn))
- return -EINVAL;
- if (u.opt.opt_optl > 16)
- return -EINVAL;
- memcpy(&scp->discdata_out, &u.opt, optlen);
- break;
- case DSO_CONACCESS:
- if (sock->state == SS_CONNECTED)
- return -EISCONN;
- if (scp->state != DN_O)
- return -EINVAL;
- if (optlen != sizeof(struct accessdata_dn))
- return -EINVAL;
- if ((u.acc.acc_accl > DN_MAXACCL) ||
- (u.acc.acc_passl > DN_MAXACCL) ||
- (u.acc.acc_userl > DN_MAXACCL))
- return -EINVAL;
- memcpy(&scp->accessdata, &u.acc, optlen);
- break;
- case DSO_ACCEPTMODE:
- if (sock->state == SS_CONNECTED)
- return -EISCONN;
- if (scp->state != DN_O)
- return -EINVAL;
- if (optlen != sizeof(int))
- return -EINVAL;
- if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
- return -EINVAL;
- scp->accept_mode = (unsigned char)u.mode;
- break;
- case DSO_CONACCEPT:
- if (scp->state != DN_CR)
- return -EINVAL;
- scp->state = DN_CC;
- dn_send_conn_conf(sk, sk->allocation);
- err = dn_wait_accept(sock, sock->file->f_flags);
- return err;
- case DSO_CONREJECT:
- if (scp->state != DN_CR)
- return -EINVAL;
- scp->state = DN_DR;
- sk->shutdown = SHUTDOWN_MASK;
- dn_nsp_send_disc(sk, 0x38, 0, sk->allocation);
- break;
- default:
- #ifdef CONFIG_NETFILTER
- return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
- #endif
- case DSO_LINKINFO:
- case DSO_STREAM:
- case DSO_SEQPACKET:
- return -ENOPROTOOPT;
- case DSO_MAXWINDOW:
- if (optlen != sizeof(unsigned long))
- return -EINVAL;
- if (u.win > NSP_MAX_WINDOW)
- u.win = NSP_MAX_WINDOW;
- if (u.win == 0)
- return -EINVAL;
- scp->max_window = u.win;
- if (scp->snd_window > u.win)
- scp->snd_window = u.win;
- break;
- case DSO_NODELAY:
- if (optlen != sizeof(int))
- return -EINVAL;
- if (scp->nonagle == 2)
- return -EINVAL;
- scp->nonagle = (u.val == 0) ? 0 : 1;
- /* if (scp->nonagle == 1) { Push pending frames } */
- break;
- case DSO_CORK:
- if (optlen != sizeof(int))
- return -EINVAL;
- if (scp->nonagle == 1)
- return -EINVAL;
- scp->nonagle = (u.val == 0) ? 0 : 2;
- /* if (scp->nonagle == 0) { Push pending frames } */
- break;
- case DSO_SERVICES:
- if (optlen != sizeof(unsigned char))
- return -EINVAL;
- if ((u.services & ~NSP_FC_MASK) != 0x01)
- return -EINVAL;
- if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
- return -EINVAL;
- scp->services_loc = u.services;
- break;
- case DSO_INFO:
- if (optlen != sizeof(unsigned char))
- return -EINVAL;
- if (u.info & 0xfc)
- return -EINVAL;
- scp->info_loc = u.info;
- break;
- }
- return 0;
- }
- static int dn_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen)
- {
- struct sock *sk = sock->sk;
- int err;
- lock_sock(sk);
- err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
- release_sock(sk);
- return err;
- }
- static int __dn_getsockopt(struct socket *sock, int level,int optname, char *optval,int *optlen, int flags)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- struct linkinfo_dn link;
- unsigned int r_len;
- void *r_data = NULL;
- unsigned int val;
- if(get_user(r_len , optlen))
- return -EFAULT;
-
- switch(optname) {
- case DSO_CONDATA:
- if (r_len > sizeof(struct optdata_dn))
- r_len = sizeof(struct optdata_dn);
- r_data = &scp->conndata_in;
- break;
- case DSO_DISDATA:
- if (r_len > sizeof(struct optdata_dn))
- r_len = sizeof(struct optdata_dn);
- r_data = &scp->discdata_in;
- break;
- case DSO_CONACCESS:
- if (r_len > sizeof(struct accessdata_dn))
- r_len = sizeof(struct accessdata_dn);
- r_data = &scp->accessdata;
- break;
- case DSO_ACCEPTMODE:
- if (r_len > sizeof(unsigned char))
- r_len = sizeof(unsigned char);
- r_data = &scp->accept_mode;
- break;
- case DSO_LINKINFO:
- if (r_len > sizeof(struct linkinfo_dn))
- r_len = sizeof(struct linkinfo_dn);
- switch(sock->state) {
- case SS_CONNECTING:
- link.idn_linkstate = LL_CONNECTING;
- break;
- case SS_DISCONNECTING:
- link.idn_linkstate = LL_DISCONNECTING;
- break;
- case SS_CONNECTED:
- link.idn_linkstate = LL_RUNNING;
- break;
- default:
- link.idn_linkstate = LL_INACTIVE;
- }
- link.idn_segsize = scp->segsize_rem;
- r_data = &link;
- break;
- default:
- #ifdef CONFIG_NETFILTER
- {
- int val, len;
-
- if(get_user(len, optlen))
- return -EFAULT;
-
- val = nf_getsockopt(sk, PF_DECnet, optname,
- optval, &len);
- if (val >= 0)
- val = put_user(len, optlen);
- return val;
- }
- #endif
- case DSO_STREAM:
- case DSO_SEQPACKET:
- case DSO_CONACCEPT:
- case DSO_CONREJECT:
- return -ENOPROTOOPT;
- case DSO_MAXWINDOW:
- if (r_len > sizeof(unsigned long))
- r_len = sizeof(unsigned long);
- r_data = &scp->max_window;
- break;
- case DSO_NODELAY:
- if (r_len > sizeof(int))
- r_len = sizeof(int);
- val = (scp->nonagle == 1);
- r_data = &val;
- break;
- case DSO_CORK:
- if (r_len > sizeof(int))
- r_len = sizeof(int);
- val = (scp->nonagle == 2);
- r_data = &val;
- break;
- case DSO_SERVICES:
- if (r_len > sizeof(unsigned char))
- r_len = sizeof(unsigned char);
- r_data = &scp->services_rem;
- break;
- case DSO_INFO:
- if (r_len > sizeof(unsigned char))
- r_len = sizeof(unsigned char);
- r_data = &scp->info_rem;
- break;
- }
- if (r_data) {
- if (copy_to_user(optval, r_data, r_len))
- return -EFAULT;
- if (put_user(r_len, optlen))
- return -EFAULT;
- }
- return 0;
- }
- /*
- * Used by send/recvmsg to wait until the socket is connected
- * before passing data.
- */
- static int dn_wait_run(struct sock *sk, int flags)
- {
- struct dn_scp *scp = DN_SK(sk);
- int err = 0;
- switch(scp->state) {
- case DN_RUN:
- return 0;
- case DN_CR:
- scp->state = DN_CC;
- dn_send_conn_conf(sk, sk->allocation);
- return dn_wait_accept(sk->socket, (flags & MSG_DONTWAIT) ? O_NONBLOCK : 0);
- case DN_CI:
- case DN_CC:
- break;
- default:
- return -ENOTCONN;
- }
- if (flags & MSG_DONTWAIT)
- return -EWOULDBLOCK;
- do {
- if ((err = sock_error(sk)) != 0)
- break;
- if (signal_pending(current)) {
- err = -ERESTARTSYS;
- break;
- }
- SOCK_SLEEP_PRE(sk)
- if (scp->state != DN_RUN)
- schedule();
- SOCK_SLEEP_POST(sk)
- } while(scp->state != DN_RUN);
- return 0;
- }
- static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
- {
- struct sk_buff *skb = q->next;
- int len = 0;
- if (flags & MSG_OOB)
- return skb_queue_len(q) ? 1 : 0;
- while(skb != (struct sk_buff *)q) {
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- len += skb->len;
- if (cb->nsp_flags & 0x40) {
- /* SOCK_SEQPACKET reads to EOM */
- if (sk->type == SOCK_SEQPACKET)
- return 1;
- /* so does SOCK_STREAM unless WAITALL is specified */
- if (!(flags & MSG_WAITALL))
- return 1;
- }
- /* minimum data length for read exceeded */
- if (len >= target)
- return 1;
- skb = skb->next;
- }
- return 0;
- }
- static int dn_recvmsg(struct socket *sock, struct msghdr *msg, int size,
- int flags, struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- struct sk_buff_head *queue = &sk->receive_queue;
- int target = size > 1 ? 1 : 0;
- int copied = 0;
- int rv = 0;
- struct sk_buff *skb, *nskb;
- struct dn_skb_cb *cb = NULL;
- unsigned char eor = 0;
- lock_sock(sk);
- if (sk->zapped) {
- rv = -EADDRNOTAVAIL;
- goto out;
- }
- if ((rv = dn_wait_run(sk, flags)) != 0)
- goto out;
- if (sk->shutdown & RCV_SHUTDOWN) {
- send_sig(SIGPIPE, current, 0);
- rv = -EPIPE;
- goto out;
- }
- if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT)) {
- rv = -EOPNOTSUPP;
- goto out;
- }
- if (flags & MSG_OOB)
- queue = &scp->other_receive_queue;
- if (flags & MSG_WAITALL)
- target = size;
- /*
- * See if there is data ready to read, sleep if there isn't
- */
- for(;;) {
- if (sk->err)
- goto out;
- if (skb_queue_len(&scp->other_receive_queue)) {
- if (!(flags & MSG_OOB)) {
- msg->msg_flags |= MSG_OOB;
- if (!scp->other_report) {
- scp->other_report = 1;
- goto out;
- }
- }
- }
-
- if (scp->state != DN_RUN)
- goto out;
- if (signal_pending(current)) {
- rv = -ERESTARTSYS;
- goto out;
- }
- if (dn_data_ready(sk, queue, flags, target))
- break;
- if (flags & MSG_DONTWAIT) {
- rv = -EWOULDBLOCK;
- goto out;
- }
- set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
- SOCK_SLEEP_PRE(sk)
- if (!dn_data_ready(sk, queue, flags, target))
- schedule();
- SOCK_SLEEP_POST(sk)
- clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
- }
- for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
- int chunk = skb->len;
- cb = DN_SKB_CB(skb);
- if ((chunk + copied) > size)
- chunk = size - copied;
- if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
- rv = -EFAULT;
- break;
- }
- copied += chunk;
- if (!(flags & MSG_PEEK))
- skb_pull(skb, chunk);
- eor = cb->nsp_flags & 0x40;
- nskb = skb->next;
- if (skb->len == 0) {
- skb_unlink(skb);
- kfree_skb(skb);
- /*
- * N.B. Don't refer to skb or cb after this point
- * in loop.
- */
- if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
- scp->flowloc_sw = DN_SEND;
- dn_nsp_send_link(sk, DN_SEND, 0);
- }
- }
- if (eor) {
- if (sk->type == SOCK_SEQPACKET)
- break;
- if (!(flags & MSG_WAITALL))
- break;
- }
- if (flags & MSG_OOB)
- break;
- if (copied >= target)
- break;
- }
- rv = copied;
- if (eor && (sk->type == SOCK_SEQPACKET))
- msg->msg_flags |= MSG_EOR;
- out:
- if (rv == 0)
- rv = (flags & MSG_PEEK) ? -sk->err : sock_error(sk);
- if ((rv >= 0) && msg->msg_name) {
- memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
- msg->msg_namelen = sizeof(struct sockaddr_dn);
- }
- release_sock(sk);
- return rv;
- }
- static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
- {
- unsigned char fctype = scp->services_rem & NSP_FC_MASK;
- if (skb_queue_len(queue) >= scp->snd_window)
- return 1;
- if (fctype != NSP_FC_NONE) {
- if (flags & MSG_OOB) {
- if (scp->flowrem_oth == 0)
- return 1;
- } else {
- if (scp->flowrem_dat == 0)
- return 1;
- }
- }
- return 0;
- }
- static int dn_sendmsg(struct socket *sock, struct msghdr *msg, int size,
- struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct dn_scp *scp = DN_SK(sk);
- int mss;
- struct sk_buff_head *queue = &scp->data_xmit_queue;
- int flags = msg->msg_flags;
- int err = 0;
- int sent = 0;
- int addr_len = msg->msg_namelen;
- struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
- struct sk_buff *skb = NULL;
- struct dn_skb_cb *cb;
- unsigned char msgflg;
- unsigned char *ptr;
- unsigned short ack;
- int len;
- unsigned char fctype;
- if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR))
- return -EOPNOTSUPP;
- if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
- return -EINVAL;
- if (sk->zapped && dn_auto_bind(sock)) {
- err = -EADDRNOTAVAIL;
- goto out;
- }
- if (scp->state == DN_O) {
- if (!addr_len || !addr) {
- err = -ENOTCONN;
- goto out;
- }
- if ((err = dn_connect(sock, (struct sockaddr *)addr, addr_len, (flags & MSG_DONTWAIT) ? O_NONBLOCK : 0)) < 0)
- goto out;
- }
- lock_sock(sk);
- if ((err = dn_wait_run(sk, flags)) < 0)
- goto out;
- if (sk->shutdown & SEND_SHUTDOWN) {
- send_sig(SIGPIPE, current, 0);
- err = -EPIPE;
- goto out;
- }
- if ((flags & MSG_TRYHARD) && sk->dst_cache)
- dst_negative_advice(&sk->dst_cache);
- mss = scp->segsize_rem;
- fctype = scp->services_rem & NSP_FC_MASK;
- if (sk->dst_cache && sk->dst_cache->neighbour) {
- struct dn_neigh *dn = (struct dn_neigh *)sk->dst_cache->neighbour;
- if (dn->blksize < (mss + 11))
- mss = dn->blksize - 11;
- }
- /*
- * The only difference between SEQPACKET & STREAM sockets under DECnet
- * is that SEQPACKET sockets set the MSG_EOR flag for the last
- * session control message segment.
- */
- if (flags & MSG_OOB) {
- mss = 16;
- queue = &scp->other_xmit_queue;
- if (size > mss) {
- err = -EMSGSIZE;
- goto out;
- }
- }
- scp->persist_fxn = dn_nsp_xmit_timeout;
- while(sent < size) {
- err = sock_error(sk);
- if (err)
- goto out;
- if (signal_pending(current)) {
- err = -ERESTARTSYS;
- goto out;
- }
- /*
- * Calculate size that we wish to send.
- */
- len = size - sent;
- if (len > mss)
- len = mss;
- /*
- * Wait for queue size to go down below the window
- * size.
- */
- if (dn_queue_too_long(scp, queue, flags)) {
- if (flags & MSG_DONTWAIT) {
- err = -EWOULDBLOCK;
- goto out;
- }
- SOCK_SLEEP_PRE(sk)
- if (dn_queue_too_long(scp, queue, flags))
- schedule();
- SOCK_SLEEP_POST(sk)
- continue;
- }
- /*
- * Get a suitably sized skb.
- */
- skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, &err);
- if (err)
- break;
- if (!skb)
- continue;
- cb = DN_SKB_CB(skb);
- ptr = skb_put(skb, 9);
- if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
- err = -EFAULT;
- goto out;
- }
- if (flags & MSG_OOB) {
- cb->segnum = scp->numoth;
- seq_add(&scp->numoth, 1);
- msgflg = 0x30;
- ack = (scp->numoth_rcv & 0x0FFF) | 0x8000;
- scp->ackxmt_oth = scp->numoth_rcv;
- if (fctype != NSP_FC_NONE)
- scp->flowrem_oth--;
- } else {
- cb->segnum = scp->numdat;
- seq_add(&scp->numdat, 1);
- msgflg = 0x00;
- if (sock->type == SOCK_STREAM)
- msgflg = 0x60;
- if (scp->seg_total == 0)
- msgflg |= 0x20;
- scp->seg_total += len;
-
- if (((sent + len) == size) && (flags & MSG_EOR)) {
- msgflg |= 0x40;
- scp->seg_total = 0;
- if (fctype == NSP_FC_SCMC)
- scp->flowrem_dat--;
- }
- ack = (scp->numdat_rcv & 0x0FFF) | 0x8000;
- scp->ackxmt_dat = scp->numdat_rcv;
- if (fctype == NSP_FC_SRC)
- scp->flowrem_dat--;
- }
- *ptr++ = msgflg;
- *(__u16 *)ptr = scp->addrrem;
- ptr += 2;
- *(__u16 *)ptr = scp->addrloc;
- ptr += 2;
- *(__u16 *)ptr = dn_htons(ack);
- ptr += 2;
- *(__u16 *)ptr = dn_htons(cb->segnum);
- sent += len;
- dn_nsp_queue_xmit(sk, skb, sk->allocation, flags & MSG_OOB);
- skb = NULL;
- scp->persist = dn_nsp_persist(sk);
- }
- out:
- if (skb)
- kfree_skb(skb);
- release_sock(sk);
- return sent ? sent : err;
- }
- static int dn_device_event(struct notifier_block *this, unsigned long event,
- void *ptr)
- {
- struct net_device *dev = (struct net_device *)ptr;
- switch(event) {
- case NETDEV_UP:
- dn_dev_up(dev);
- break;
- case NETDEV_DOWN:
- dn_dev_down(dev);
- break;
- default:
- break;
- }
- return NOTIFY_DONE;
- }
- static struct notifier_block dn_dev_notifier = {
- notifier_call: dn_device_event,
- };
- extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
- static struct packet_type dn_dix_packet_type = {
- type: __constant_htons(ETH_P_DNA_RT),
- dev: NULL, /* All devices */
- func: dn_route_rcv,
- data: (void*)1,
- };
- #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
- static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
- {
- int i;
-
- switch (dn_ntohs(dn->sdn_objnamel)) {
- case 0:
- sprintf(buf, "%d", dn->sdn_objnum);
- break;
- default:
- for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
- buf[i] = dn->sdn_objname[i];
- if (IS_NOT_PRINTABLE(buf[i]))
- buf[i] = '.';
- }
- buf[i] = 0;
- }
- }
- static int dn_get_info(char *buffer, char **start, off_t offset, int length)
- {
- struct sock *sk;
- struct dn_scp *scp;
- int len = 0;
- off_t pos = 0;
- off_t begin = 0;
- char buf1[DN_ASCBUF_LEN];
- char buf2[DN_ASCBUF_LEN];
- char local_object[DN_MAXOBJL+3];
- char remote_object[DN_MAXOBJL+3];
- int i;
- len += sprintf(buffer + len, "Local Remoten");
- read_lock(&dn_hash_lock);
- for(i = 0; i < DN_SK_HASH_SIZE; i++) {
- for(sk = dn_sk_hash[i]; sk != NULL; sk = sk->next) {
- scp = DN_SK(sk);
- dn_printable_object(&scp->addr, local_object);
- dn_printable_object(&scp->peer, remote_object);
- len += sprintf(buffer + len,
- "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %sn",
- dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
- scp->addrloc,
- scp->numdat,
- scp->numoth,
- scp->ackxmt_dat,
- scp->ackxmt_oth,
- scp->flowloc_sw,
- local_object,
- dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
- scp->addrrem,
- scp->numdat_rcv,
- scp->numoth_rcv,
- scp->ackrcv_dat,
- scp->ackrcv_oth,
- scp->flowrem_sw,
- remote_object,
- dn_state2asc(scp->state),
- ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
- pos = begin + len;
- if (pos < offset) {
- len = 0;
- begin = pos;
- }
- if (pos > (offset + length))
- break;
- }
- }
- read_unlock(&dn_hash_lock);
- *start = buffer + (offset - begin);
- len -= (offset - begin);
- if (len > length)
- len = length;
- return len;
- }
- static struct net_proto_family dn_family_ops = {
- family: AF_DECnet,
- create: dn_create,
- };
- static struct proto_ops dn_proto_ops = {
- family: AF_DECnet,
- release: dn_release,
- bind: dn_bind,
- connect: dn_connect,
- socketpair: sock_no_socketpair,
- accept: dn_accept,
- getname: dn_getname,
- poll: dn_poll,
- ioctl: dn_ioctl,
- listen: dn_listen,
- shutdown: dn_shutdown,
- setsockopt: dn_setsockopt,
- getsockopt: dn_getsockopt,
- sendmsg: dn_sendmsg,
- recvmsg: dn_recvmsg,
- mmap: sock_no_mmap,
- sendpage: sock_no_sendpage,
- };
- #ifdef CONFIG_SYSCTL
- void dn_register_sysctl(void);
- void dn_unregister_sysctl(void);
- #endif
- #ifdef MODULE
- EXPORT_NO_SYMBOLS;
- MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
- MODULE_AUTHOR("Linux DECnet Project Team");
- MODULE_LICENSE("GPL");
- static int addr[2] = {0, 0};
- MODULE_PARM(addr, "2i");
- MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
- #endif
- static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.4.15-pre5s (C) 1995-2001 Linux DECnet Project Teamn";
- static int __init decnet_init(void)
- {
- #ifdef MODULE
- if (addr[0] > 63 || addr[0] < 0) {
- printk(KERN_ERR "DECnet: Area must be between 0 and 63");
- return 1;
- }
- if (addr[1] > 1023 || addr[1] < 0) {
- printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
- return 1;
- }
- decnet_address = dn_htons((addr[0] << 10) | addr[1]);
- dn_dn2eth(decnet_ether_address, dn_ntohs(decnet_address));
- #endif
- printk(banner);
- sock_register(&dn_family_ops);
- dev_add_pack(&dn_dix_packet_type);
- register_netdevice_notifier(&dn_dev_notifier);
- proc_net_create("decnet", 0, dn_get_info);
- dn_neigh_init();
- dn_dev_init();
- dn_route_init();
- #ifdef CONFIG_DECNET_ROUTER
- dn_fib_init();
- #endif /* CONFIG_DECNET_ROUTER */
- #ifdef CONFIG_SYSCTL
- dn_register_sysctl();
- #endif /* CONFIG_SYSCTL */
- /*
- * Prevent DECnet module unloading until its fixed properly.
- * Requires an audit of the code to check for memory leaks and
- * initialisation problems etc.
- */
- MOD_INC_USE_COUNT;
- return 0;
- }
- #ifndef MODULE
- static int __init decnet_setup(char *str)
- {
- unsigned short area = simple_strtoul(str, &str, 0);
- unsigned short node = simple_strtoul(*str > 0 ? ++str : str, &str, 0);
- decnet_address = dn_htons(area << 10 | node);
- dn_dn2eth(decnet_ether_address, dn_ntohs(decnet_address));
- return 1;
- }
- __setup("decnet=", decnet_setup);
- #endif
- static void __exit decnet_exit(void)
- {
- sock_unregister(AF_DECnet);
- dev_remove_pack(&dn_dix_packet_type);
- #ifdef CONFIG_SYSCTL
- dn_unregister_sysctl();
- #endif /* CONFIG_SYSCTL */
- unregister_netdevice_notifier(&dn_dev_notifier);
- dn_route_cleanup();
- dn_dev_cleanup();
- dn_neigh_cleanup();
- #ifdef CONFIG_DECNET_ROUTER
- dn_fib_cleanup();
- #endif /* CONFIG_DECNET_ROUTER */
- proc_net_remove("decnet");
- }
- module_init(decnet_init);
- module_exit(decnet_exit);