Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1079 insertions, 0 deletions

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
new file mode 100644
index 000000000000..20b4cfebd74c
--- /dev/null
+++ b/net/llc/af_llc.c
@@ -0,0 +1,1079 @@
+/*
+ * af_llc.c - LLC User Interface SAPs
+ * Description:
+ *   Functions in this module are implementation of socket based llc
+ *   communications for the Linux operating system. Support of llc class
+ *   one and class two is provided via SOCK_DGRAM and SOCK_STREAM
+ *   respectively.
+ *
+ *   An llc2 connection is (mac + sap), only one llc2 sap connection
+ *   is allowed per mac. Though one sap may have multiple mac + sap
+ *   connections.
+ *
+ * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
+ *               2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program can be redistributed or modified under the terms of the
+ * GNU General Public License as published by the Free Software Foundation.
+ * This program is distributed without any warranty or implied warranty
+ * of merchantability or fitness for a particular purpose.
+ *
+ * See the GNU General Public License for more details.
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/tcp.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <net/llc.h>
+#include <net/llc_sap.h>
+#include <net/llc_pdu.h>
+#include <net/llc_conn.h>
+
+/* remember: uninitialized global data is zeroed because its in .bss */
+static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
+static u16 llc_ui_sap_link_no_max[256];
+static struct sockaddr_llc llc_ui_addrnull;
+static struct proto_ops llc_ui_ops;
+
+static int llc_ui_wait_for_conn(struct sock *sk, int timeout);
+static int llc_ui_wait_for_disc(struct sock *sk, int timeout);
+static int llc_ui_wait_for_data(struct sock *sk, int timeout);
+static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout);
+
+#if 0
+#define dprintk(args...) printk(KERN_DEBUG args)
+#else
+#define dprintk(args...)
+#endif
+
+/**
+ *      llc_ui_next_link_no - return the next unused link number for a sap
+ *      @sap: Address of sap to get link number from.
+ *
+ *      Return the next unused link number for a given sap.
+ */
+static __inline__ u16 llc_ui_next_link_no(int sap)
+{
+        return llc_ui_sap_link_no_max[sap]++;
+}
+
+/**
+ *      llc_proto_type - return eth protocol for ARP header type
+ *      @arphrd: ARP header type.
+ *
+ *      Given an ARP header type return the corresponding ethernet protocol.
+ */
+static __inline__ u16 llc_proto_type(u16 arphrd)
+{
+        return arphrd == ARPHRD_IEEE802_TR ?
+                         htons(ETH_P_TR_802_2) : htons(ETH_P_802_2);
+}
+
+/**
+ *      llc_ui_addr_null - determines if a address structure is null
+ *      @addr: Address to test if null.
+ */
+static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr)
+{
+        return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
+}
+
+/**
+ *      llc_ui_header_len - return length of llc header based on operation
+ *      @sk: Socket which contains a valid llc socket type.
+ *      @addr: Complete sockaddr_llc structure received from the user.
+ *
+ *      Provide the length of the llc header depending on what kind of
+ *      operation the user would like to perform and the type of socket.
+ *      Returns the correct llc header length.
+ */
+static __inline__ u8 llc_ui_header_len(struct sock *sk,
+                                       struct sockaddr_llc *addr)
+{
+        u8 rc = LLC_PDU_LEN_U;
+
+        if (addr->sllc_test || addr->sllc_xid)
+                rc = LLC_PDU_LEN_U;
+        else if (sk->sk_type == SOCK_STREAM)
+                rc = LLC_PDU_LEN_I;
+        return rc;
+}
+
+/**
+ *      llc_ui_send_data - send data via reliable llc2 connection
+ *      @sk: Connection the socket is using.
+ *      @skb: Data the user wishes to send.
+ *      @addr: Source and destination fields provided by the user.
+ *      @noblock: can we block waiting for data?
+ *
+ *      Send data via reliable llc2 connection.
+ *      Returns 0 upon success, non-zero if action did not succeed.
+ */
+static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
+{
+        struct llc_sock* llc = llc_sk(sk);
+        int rc = 0;
+
+        if (llc_data_accept_state(llc->state) || llc->p_flag) {
+                int timeout = sock_sndtimeo(sk, noblock);
+
+                rc = llc_ui_wait_for_busy_core(sk, timeout);
+        }
+        if (!rc)
+                rc = llc_build_and_send_pkt(sk, skb);
+        return rc;
+}
+
+static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
+{
+        sk->sk_type     = sock->type;
+        sk->sk_sleep    = &sock->wait;
+        sk->sk_socket   = sock;
+        sock->sk        = sk;
+        sock->ops       = &llc_ui_ops;
+}
+
+static struct proto llc_proto = {
+        .name     = "DDP",
+        .owner    = THIS_MODULE,
+        .obj_size = sizeof(struct llc_sock),
+};
+
+/**
+ *      llc_ui_create - alloc and init a new llc_ui socket
+ *      @sock: Socket to initialize and attach allocated sk to.
+ *      @protocol: Unused.
+ *
+ *      Allocate and initialize a new llc_ui socket, validate the user wants a
+ *      socket type we have available.
+ *      Returns 0 upon success, negative upon failure.
+ */
+static int llc_ui_create(struct socket *sock, int protocol)
+{
+        struct sock *sk;
+        int rc = -ESOCKTNOSUPPORT;
+
+        if (sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM) {
+                rc = -ENOMEM;
+                sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto);
+                if (sk) {
+                        rc = 0;
+                        llc_ui_sk_init(sock, sk);
+                }
+        }
+        return rc;
+}
+
+/**
+ *      llc_ui_release - shutdown socket
+ *      @sock: Socket to release.
+ *
+ *      Shutdown and deallocate an existing socket.
+ */
+static int llc_ui_release(struct socket *sock)
+{
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc;
+
+        if (!sk)
+                goto out;
+        sock_hold(sk);
+        lock_sock(sk);
+        llc = llc_sk(sk);
+        dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__,
+                llc->laddr.lsap, llc->daddr.lsap);
+        if (!llc_send_disc(sk))
+                llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
+        if (!sock_flag(sk, SOCK_ZAPPED))
+                llc_sap_remove_socket(llc->sap, sk);
+        release_sock(sk);
+        if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) {
+                llc_release_sockets(llc->sap);
+                llc_sap_close(llc->sap);
+        }
+        if (llc->dev)
+                dev_put(llc->dev);
+        sock_put(sk);
+        llc_sk_free(sk);
+out:
+        return 0;
+}
+
+/**
+ *      llc_ui_autoport - provide dynamically allocate SAP number
+ *
+ *      Provide the caller with a dynamically allocated SAP number according
+ *      to the rules that are set in this function. Returns: 0, upon failure,
+ *      SAP number otherwise.
+ */
+static int llc_ui_autoport(void)
+{
+        struct llc_sap *sap;
+        int i, tries = 0;
+
+        while (tries < LLC_SAP_DYN_TRIES) {
+                for (i = llc_ui_sap_last_autoport;
+                     i < LLC_SAP_DYN_STOP; i += 2) {
+                        sap = llc_sap_find(i);
+                        if (!sap) {
+                                llc_ui_sap_last_autoport = i + 2;
+                                goto out;
+                        }
+                }
+                llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
+                tries++;
+        }
+        i = 0;
+out:
+        return i;
+}
+
+/**
+ *      llc_ui_autobind - Bind a socket to a specific address.
+ *      @sk: Socket to bind an address to.
+ *      @addr: Address the user wants the socket bound to.
+ *
+ *      Bind a socket to a specific address. For llc a user is able to bind to
+ *      a specific sap only or mac + sap. If the user only specifies a sap and
+ *      a null dmac (all zeros) the user is attempting to bind to an entire
+ *      sap. This will stop anyone else on the local system from using that
+ *      sap.  If someone else has a mac + sap open the bind to null + sap will
+ *      fail.
+ *      If the user desires to bind to a specific mac + sap, it is possible to
+ *      have multiple sap connections via multiple macs.
+ *      Bind and autobind for that matter must enforce the correct sap usage
+ *      otherwise all hell will break loose.
+ *      Returns: 0 upon success, negative otherwise.
+ */
+static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
+{
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        struct llc_sap *sap;
+        int rc = -EINVAL;
+
+        if (!sock_flag(sk, SOCK_ZAPPED))
+                goto out;
+        rc = -ENODEV;
+        llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd);
+        if (!llc->dev)
+                goto out;
+        rc = -EUSERS;
+        llc->laddr.lsap = llc_ui_autoport();
+        if (!llc->laddr.lsap)
+                goto out;
+        rc = -EBUSY; /* some other network layer is using the sap */
+        sap = llc_sap_open(llc->laddr.lsap, NULL);
+        if (!sap)
+                goto out;
+        memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
+        memcpy(&llc->addr, addr, sizeof(llc->addr));
+        /* assign new connection to its SAP */
+        llc_sap_add_socket(sap, sk);
+        sock_reset_flag(sk, SOCK_ZAPPED);
+        rc = 0;
+out:
+        return rc;
+}
+
+/**
+ *      llc_ui_bind - bind a socket to a specific address.
+ *      @sock: Socket to bind an address to.
+ *      @uaddr: Address the user wants the socket bound to.
+ *      @addrlen: Length of the uaddr structure.
+ *
+ *      Bind a socket to a specific address. For llc a user is able to bind to
+ *      a specific sap only or mac + sap. If the user only specifies a sap and
+ *      a null dmac (all zeros) the user is attempting to bind to an entire
+ *      sap. This will stop anyone else on the local system from using that
+ *      sap. If someone else has a mac + sap open the bind to null + sap will
+ *      fail.
+ *      If the user desires to bind to a specific mac + sap, it is possible to
+ *      have multiple sap connections via multiple macs.
+ *      Bind and autobind for that matter must enforce the correct sap usage
+ *      otherwise all hell will break loose.
+ *      Returns: 0 upon success, negative otherwise.
+ */
+static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
+{
+        struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        struct llc_sap *sap;
+        int rc = -EINVAL;
+
+        dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap);
+        if (!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))
+                goto out;
+        rc = -EAFNOSUPPORT;
+        if (addr->sllc_family != AF_LLC)
+                goto out;
+        if (!addr->sllc_sap) {
+                rc = -EUSERS;
+                addr->sllc_sap = llc_ui_autoport();
+                if (!addr->sllc_sap)
+                        goto out;
+        }
+        sap = llc_sap_find(addr->sllc_sap);
+        if (!sap) {
+                sap = llc_sap_open(addr->sllc_sap, NULL);
+                rc = -EBUSY; /* some other network layer is using the sap */
+                if (!sap)
+                        goto out;
+        } else {
+                struct llc_addr laddr, daddr;
+                struct sock *ask;
+
+                memset(&laddr, 0, sizeof(laddr));
+                memset(&daddr, 0, sizeof(daddr));
+                /*
+                 * FIXME: check if the the address is multicast,
+                 *        only SOCK_DGRAM can do this.
+                 */
+                memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
+                laddr.lsap = addr->sllc_sap;
+                rc = -EADDRINUSE; /* mac + sap clash. */
+                ask = llc_lookup_established(sap, &daddr, &laddr);
+                if (ask) {
+                        sock_put(ask);
+                        goto out;
+                }
+        }
+        llc->laddr.lsap = addr->sllc_sap;
+        memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
+        memcpy(&llc->addr, addr, sizeof(llc->addr));
+        /* assign new connection to its SAP */
+        llc_sap_add_socket(sap, sk);
+        sock_reset_flag(sk, SOCK_ZAPPED);
+        rc = 0;
+out:
+        return rc;
+}
+
+/**
+ *      llc_ui_shutdown - shutdown a connect llc2 socket.
+ *      @sock: Socket to shutdown.
+ *      @how: What part of the socket to shutdown.
+ *
+ *      Shutdown a connected llc2 socket. Currently this function only supports
+ *      shutting down both sends and receives (2), we could probably make this
+ *      function such that a user can shutdown only half the connection but not
+ *      right now.
+ *      Returns: 0 upon success, negative otherwise.
+ */
+static int llc_ui_shutdown(struct socket *sock, int how)
+{
+        struct sock *sk = sock->sk;
+        int rc = -ENOTCONN;
+
+        lock_sock(sk);
+        if (sk->sk_state != TCP_ESTABLISHED)
+                goto out;
+        rc = -EINVAL;
+        if (how != 2)
+                goto out;
+        rc = llc_send_disc(sk);
+        if (!rc)
+                rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
+        /* Wake up anyone sleeping in poll */
+        sk->sk_state_change(sk);
+out:
+        release_sock(sk);
+        return rc;
+}
+
+/**
+ *      llc_ui_connect - Connect to a remote llc2 mac + sap.
+ *      @sock: Socket which will be connected to the remote destination.
+ *      @uaddr: Remote and possibly the local address of the new connection.
+ *      @addrlen: Size of uaddr structure.
+ *      @flags: Operational flags specified by the user.
+ *
+ *      Connect to a remote llc2 mac + sap. The caller must specify the
+ *      destination mac and address to connect to. If the user hasn't previously
+ *      called bind(2) with a smac the address of the first interface of the
+ *      specified arp type will be used.
+ *      This function will autobind if user did not previously call bind.
+ *      Returns: 0 upon success, negative otherwise.
+ */
+static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
+                          int addrlen, int flags)
+{
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
+        struct net_device *dev;
+        int rc = -EINVAL;
+
+        lock_sock(sk);
+        if (addrlen != sizeof(*addr))
+                goto out;
+        rc = -EAFNOSUPPORT;
+        if (addr->sllc_family != AF_LLC)
+                goto out;
+        /* bind connection to sap if user hasn't done it. */
+        if (sock_flag(sk, SOCK_ZAPPED)) {
+                /* bind to sap with null dev, exclusive */
+                rc = llc_ui_autobind(sock, addr);
+                if (rc)
+                        goto out;
+                llc->daddr.lsap = addr->sllc_sap;
+                memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
+        }
+        dev = llc->dev;
+        if (sk->sk_type != SOCK_STREAM)
+                goto out;
+        rc = -EALREADY;
+        if (sock->state == SS_CONNECTING)
+                goto out;
+        sock->state = SS_CONNECTING;
+        sk->sk_state   = TCP_SYN_SENT;
+        llc->link   = llc_ui_next_link_no(llc->sap->laddr.lsap);
+        rc = llc_establish_connection(sk, dev->dev_addr,
+                                      addr->sllc_mac, addr->sllc_sap);
+        if (rc) {
+                dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__);
+                sock->state  = SS_UNCONNECTED;
+                sk->sk_state = TCP_CLOSE;
+                goto out;
+        }
+        rc = llc_ui_wait_for_conn(sk, sk->sk_rcvtimeo);
+        if (rc)
+                dprintk("%s: llc_ui_wait_for_conn failed=%d\n", __FUNCTION__, rc);
+out:
+        release_sock(sk);
+        return rc;
+}
+
+/**
+ *      llc_ui_listen - allow a normal socket to accept incoming connections
+ *      @sock: Socket to allow incoming connections on.
+ *      @backlog: Number of connections to queue.
+ *
+ *      Allow a normal socket to accept incoming connections.
+ *      Returns 0 upon success, negative otherwise.
+ */
+static int llc_ui_listen(struct socket *sock, int backlog)
+{
+        struct sock *sk = sock->sk;
+        int rc = -EINVAL;
+
+        lock_sock(sk);
+        if (sock->state != SS_UNCONNECTED)
+                goto out;
+        rc = -EOPNOTSUPP;
+        if (sk->sk_type != SOCK_STREAM)
+                goto out;
+        rc = -EAGAIN;
+        if (sock_flag(sk, SOCK_ZAPPED))
+                goto out;
+        rc = 0;
+        if (!(unsigned)backlog) /* BSDism */
+                backlog = 1;
+        sk->sk_max_ack_backlog = backlog;
+        if (sk->sk_state != TCP_LISTEN) {
+                sk->sk_ack_backlog = 0;
+                sk->sk_state       = TCP_LISTEN;
+        }
+        sk->sk_socket->flags |= __SO_ACCEPTCON;
+out:
+        release_sock(sk);
+        return rc;
+}
+
+static int llc_ui_wait_for_disc(struct sock *sk, int timeout)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int rc;
+
+        add_wait_queue_exclusive(sk->sk_sleep, &wait);
+        for (;;) {
+                __set_current_state(TASK_INTERRUPTIBLE);
+                rc = 0;
+                if (sk->sk_state != TCP_CLOSE) {
+                        release_sock(sk);
+                        timeout = schedule_timeout(timeout);
+                        lock_sock(sk);
+                } else
+                        break;
+                rc = -ERESTARTSYS;
+                if (signal_pending(current))
+                        break;
+                rc = -EAGAIN;
+                if (!timeout)
+                        break;
+        }
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(sk->sk_sleep, &wait);
+        return rc;
+}
+
+static int llc_ui_wait_for_conn(struct sock *sk, int timeout)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int rc;
+
+        add_wait_queue_exclusive(sk->sk_sleep, &wait);
+        for (;;) {
+                __set_current_state(TASK_INTERRUPTIBLE);
+                rc = -EAGAIN;
+                if (sk->sk_state == TCP_CLOSE)
+                        break;
+                rc = 0;
+                if (sk->sk_state != TCP_ESTABLISHED) {
+                        release_sock(sk);
+                        timeout = schedule_timeout(timeout);
+                        lock_sock(sk);
+                } else
+                        break;
+                rc = -ERESTARTSYS;
+                if (signal_pending(current))
+                        break;
+                rc = -EAGAIN;
+                if (!timeout)
+                        break;
+        }
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(sk->sk_sleep, &wait);
+        return rc;
+}
+
+static int llc_ui_wait_for_data(struct sock *sk, int timeout)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int rc = 0;
+
+        add_wait_queue_exclusive(sk->sk_sleep, &wait);
+        for (;;) {
+                __set_current_state(TASK_INTERRUPTIBLE);
+                if (sk->sk_shutdown & RCV_SHUTDOWN)
+                        break;
+                /*
+                 * Well, if we have backlog, try to process it now.
+                 */
+                if (sk->sk_backlog.tail) {
+                        release_sock(sk);
+                        lock_sock(sk);
+                }
+                rc = 0;
+                if (skb_queue_empty(&sk->sk_receive_queue)) {
+                        release_sock(sk);
+                        timeout = schedule_timeout(timeout);
+                        lock_sock(sk);
+                } else
+                        break;
+                rc = -ERESTARTSYS;
+                if (signal_pending(current))
+                        break;
+                rc = -EAGAIN;
+                if (!timeout)
+                        break;
+        }
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(sk->sk_sleep, &wait);
+        return rc;
+}
+
+static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        struct llc_sock *llc = llc_sk(sk);
+        int rc;
+
+        add_wait_queue_exclusive(sk->sk_sleep, &wait);
+        for (;;) {
+                dprintk("%s: looping...\n", __FUNCTION__);
+                __set_current_state(TASK_INTERRUPTIBLE);
+                rc = -ENOTCONN;
+                if (sk->sk_shutdown & RCV_SHUTDOWN)
+                        break;
+                rc = 0;
+                if (llc_data_accept_state(llc->state) || llc->p_flag) {
+                        release_sock(sk);
+                        timeout = schedule_timeout(timeout);
+                        lock_sock(sk);
+                } else
+                        break;
+                rc = -ERESTARTSYS;
+                if (signal_pending(current))
+                        break;
+                rc = -EAGAIN;
+                if (!timeout)
+                        break;
+        }
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(sk->sk_sleep, &wait);
+        return rc;
+}
+
+/**
+ *      llc_ui_accept - accept a new incoming connection.
+ *      @sock: Socket which connections arrive on.
+ *      @newsock: Socket to move incoming connection to.
+ *      @flags: User specified operational flags.
+ *
+ *      Accept a new incoming connection.
+ *      Returns 0 upon success, negative otherwise.
+ */
+static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+        struct sock *sk = sock->sk, *newsk;
+        struct llc_sock *llc, *newllc;
+        struct sk_buff *skb;
+        int rc = -EOPNOTSUPP;
+
+        dprintk("%s: accepting on %02X\n", __FUNCTION__,
+                llc_sk(sk)->laddr.lsap);
+        lock_sock(sk);
+        if (sk->sk_type != SOCK_STREAM)
+                goto out;
+        rc = -EINVAL;
+        if (sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN)
+                goto out;
+        /* wait for a connection to arrive. */
+        rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo);
+        if (rc)
+                goto out;
+        dprintk("%s: got a new connection on %02X\n", __FUNCTION__,
+                llc_sk(sk)->laddr.lsap);
+        skb = skb_dequeue(&sk->sk_receive_queue);
+        rc = -EINVAL;
+        if (!skb->sk)
+                goto frees;
+        rc = 0;
+        newsk = skb->sk;
+        /* attach connection to a new socket. */
+        llc_ui_sk_init(newsock, newsk);
+        sock_reset_flag(newsk, SOCK_ZAPPED);
+        newsk->sk_state         = TCP_ESTABLISHED;
+        newsock->state          = SS_CONNECTED;
+        llc                     = llc_sk(sk);
+        newllc                  = llc_sk(newsk);
+        memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
+        newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
+
+        /* put original socket back into a clean listen state. */
+        sk->sk_state = TCP_LISTEN;
+        sk->sk_ack_backlog--;
+        skb->sk = NULL;
+        dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
+                llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
+frees:
+        kfree_skb(skb);
+out:
+        release_sock(sk);
+        return rc;
+}
+
+/**
+ *      llc_ui_recvmsg - copy received data to the socket user.
+ *      @sock: Socket to copy data from.
+ *      @msg: Various user space related information.
+ *      @size: Size of user buffer.
+ *      @flags: User specified flags.
+ *
+ *      Copy received data to the socket user.
+ *      Returns non-negative upon success, negative otherwise.
+ */
+static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
+                          struct msghdr *msg, size_t size, int flags)
+{
+        struct sock *sk = sock->sk;
+        struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
+        struct sk_buff *skb;
+        size_t copied = 0;
+        int rc = -ENOMEM, timeout;
+        int noblock = flags & MSG_DONTWAIT;
+
+        dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__,
+                llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
+        lock_sock(sk);
+        timeout = sock_rcvtimeo(sk, noblock);
+        rc = llc_ui_wait_for_data(sk, timeout);
+        if (rc) {
+                dprintk("%s: llc_ui_wait_for_data failed recv "
+                        "in %02X from %02X\n", __FUNCTION__,
+                        llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
+                goto out;
+        }
+        skb = skb_dequeue(&sk->sk_receive_queue);
+        if (!skb) /* shutdown */
+                goto out;
+        copied = skb->len;
+        if (copied > size)
+                copied = size;
+        rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+        if (rc)
+                goto dgram_free;
+        if (skb->len > copied) {
+                skb_pull(skb, copied);
+                skb_queue_head(&sk->sk_receive_queue, skb);
+        }
+        if (uaddr)
+                memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
+        msg->msg_namelen = sizeof(*uaddr);
+        if (!skb->list) {
+dgram_free:
+                kfree_skb(skb);
+        }
+out:
+        release_sock(sk);
+        return rc ? : copied;
+}
+
+/**
+ *      llc_ui_sendmsg - Transmit data provided by the socket user.
+ *      @sock: Socket to transmit data from.
+ *      @msg: Various user related information.
+ *      @len: Length of data to transmit.
+ *
+ *      Transmit data provided by the socket user.
+ *      Returns non-negative upon success, negative otherwise.
+ */
+static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
+                          struct msghdr *msg, size_t len)
+{
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
+        int flags = msg->msg_flags;
+        int noblock = flags & MSG_DONTWAIT;
+        struct net_device *dev;
+        struct sk_buff *skb;
+        size_t size = 0;
+        int rc = -EINVAL, copied = 0, hdrlen;
+
+        dprintk("%s: sending from %02X to %02X\n", __FUNCTION__,
+                llc->laddr.lsap, llc->daddr.lsap);
+        lock_sock(sk);
+        if (addr) {
+                if (msg->msg_namelen < sizeof(*addr))
+                        goto release;
+        } else {
+                if (llc_ui_addr_null(&llc->addr))
+                        goto release;
+                addr = &llc->addr;
+        }
+        /* must bind connection to sap if user hasn't done it. */
+        if (sock_flag(sk, SOCK_ZAPPED)) {
+                /* bind to sap with null dev, exclusive. */
+                rc = llc_ui_autobind(sock, addr);
+                if (rc)
+                        goto release;
+        }
+        dev = llc->dev;
+        hdrlen = dev->hard_header_len + llc_ui_header_len(sk, addr);
+        size = hdrlen + len;
+        if (size > dev->mtu)
+                size = dev->mtu;
+        copied = size - hdrlen;
+        release_sock(sk);
+        skb = sock_alloc_send_skb(sk, size, noblock, &rc);
+        lock_sock(sk);
+        if (!skb)
+                goto release;
+        skb->sk       = sk;
+        skb->dev      = dev;
+        skb->protocol = llc_proto_type(addr->sllc_arphrd);
+        skb_reserve(skb, hdrlen); 
+        rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
+        if (rc)
+                goto out;
+        if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
+                llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
+                                          addr->sllc_sap);
+                goto out;
+        }
+        if (addr->sllc_test) {
+                llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
+                                            addr->sllc_sap);
+                goto out;
+        }
+        if (addr->sllc_xid) {
+                llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
+                                           addr->sllc_sap);
+                goto out;
+        }
+        rc = -ENOPROTOOPT;
+        if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
+                goto out;
+        rc = llc_ui_send_data(sk, skb, noblock);
+        if (rc)
+                dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc);
+out:
+        if (rc)
+                kfree_skb(skb);
+release:
+        if (rc)
+                dprintk("%s: failed sending from %02X to %02X: %d\n",
+                        __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc);
+        release_sock(sk);
+        return rc ? : copied;
+}
+
+/**
+ *      llc_ui_getname - return the address info of a socket
+ *      @sock: Socket to get address of.
+ *      @uaddr: Address structure to return information.
+ *      @uaddrlen: Length of address structure.
+ *      @peer: Does user want local or remote address information.
+ *
+ *      Return the address information of a socket.
+ */
+static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
+                          int *uaddrlen, int peer)
+{
+        struct sockaddr_llc sllc;
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        int rc = 0;
+
+        lock_sock(sk);
+        if (sock_flag(sk, SOCK_ZAPPED))
+                goto out;
+        *uaddrlen = sizeof(sllc);
+        memset(uaddr, 0, *uaddrlen);
+        if (peer) {
+                rc = -ENOTCONN;
+                if (sk->sk_state != TCP_ESTABLISHED)
+                        goto out;
+                if(llc->dev)
+                        sllc.sllc_arphrd = llc->dev->type;
+                sllc.sllc_sap = llc->daddr.lsap;
+                memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
+        } else {
+                rc = -EINVAL;
+                if (!llc->sap)
+                        goto out;
+                sllc.sllc_sap = llc->sap->laddr.lsap;
+
+                if (llc->dev) {
+                        sllc.sllc_arphrd = llc->dev->type;
+                        memcpy(&sllc.sllc_mac, &llc->dev->dev_addr,
+                               IFHWADDRLEN);
+                }
+        }
+        rc = 0;
+        sllc.sllc_family = AF_LLC;
+        memcpy(uaddr, &sllc, sizeof(sllc));
+out:
+        release_sock(sk);
+        return rc;
+}
+
+/**
+ *      llc_ui_ioctl - io controls for PF_LLC
+ *      @sock: Socket to get/set info
+ *      @cmd: command
+ *      @arg: optional argument for cmd
+ *
+ *      get/set info on llc sockets
+ */
+static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
+                        unsigned long arg)
+{
+        return dev_ioctl(cmd, (void __user *)arg);
+}
+
+/**
+ *      llc_ui_setsockopt - set various connection specific parameters.
+ *      @sock: Socket to set options on.
+ *      @level: Socket level user is requesting operations on.
+ *      @optname: Operation name.
+ *      @optval User provided operation data.
+ *      @optlen: Length of optval.
+ *
+ *      Set various connection specific parameters.
+ */
+static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
+                             char __user *optval, int optlen)
+{
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        int rc = -EINVAL, opt;
+
+        lock_sock(sk);
+        if (level != SOL_LLC || optlen != sizeof(int))
+                goto out;
+        rc = get_user(opt, (int __user *)optval);
+        if (rc)
+                goto out;
+        rc = -EINVAL;
+        switch (optname) {
+        case LLC_OPT_RETRY:
+                if (opt > LLC_OPT_MAX_RETRY)
+                        goto out;
+                llc->n2 = opt;
+                break;
+        case LLC_OPT_SIZE:
+                if (opt > LLC_OPT_MAX_SIZE)
+                        goto out;
+                llc->n1 = opt;
+                break;
+        case LLC_OPT_ACK_TMR_EXP:
+                if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
+                        goto out;
+                llc->ack_timer.expire = opt;
+                break;
+        case LLC_OPT_P_TMR_EXP:
+                if (opt > LLC_OPT_MAX_P_TMR_EXP)
+                        goto out;
+                llc->pf_cycle_timer.expire = opt;
+                break;
+        case LLC_OPT_REJ_TMR_EXP:
+                if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
+                        goto out;
+                llc->rej_sent_timer.expire = opt;
+                break;
+        case LLC_OPT_BUSY_TMR_EXP:
+                if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
+                        goto out;
+                llc->busy_state_timer.expire = opt;
+                break;
+        case LLC_OPT_TX_WIN:
+                if (opt > LLC_OPT_MAX_WIN)
+                        goto out;
+                llc->k = opt;
+                break;
+        case LLC_OPT_RX_WIN:
+                if (opt > LLC_OPT_MAX_WIN)
+                        goto out;
+                llc->rw = opt;
+                break;
+        default:
+                rc = -ENOPROTOOPT;
+                goto out;
+        }
+        rc = 0;
+out:
+        release_sock(sk);
+        return rc;
+}
+
+/**
+ *      llc_ui_getsockopt - get connection specific socket info
+ *      @sock: Socket to get information from.
+ *      @level: Socket level user is requesting operations on.
+ *      @optname: Operation name.
+ *      @optval: Variable to return operation data in.
+ *      @optlen: Length of optval.
+ *
+ *      Get connection specific socket information.
+ */
+static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
+                             char __user *optval, int __user *optlen)
+{
+        struct sock *sk = sock->sk;
+        struct llc_sock *llc = llc_sk(sk);
+        int val = 0, len = 0, rc = -EINVAL;
+
+        lock_sock(sk);
+        if (level != SOL_LLC)
+                goto out;
+        rc = get_user(len, optlen);
+        if (rc)
+                goto out;
+        rc = -EINVAL;
+        if (len != sizeof(int))
+                goto out;
+        switch (optname) {
+        case LLC_OPT_RETRY:
+                val = llc->n2;                          break;
+        case LLC_OPT_SIZE:
+                val = llc->n1;                          break;
+        case LLC_OPT_ACK_TMR_EXP:
+                val = llc->ack_timer.expire;            break;
+        case LLC_OPT_P_TMR_EXP:
+                val = llc->pf_cycle_timer.expire;       break;
+        case LLC_OPT_REJ_TMR_EXP:
+                val = llc->rej_sent_timer.expire;       break;
+        case LLC_OPT_BUSY_TMR_EXP:
+                val = llc->busy_state_timer.expire;     break;
+        case LLC_OPT_TX_WIN:
+                val = llc->k;                           break;
+        case LLC_OPT_RX_WIN:
+                val = llc->rw;                          break;
+        default:
+                rc = -ENOPROTOOPT;
+                goto out;
+        }
+        rc = 0;
+        if (put_user(len, optlen) || copy_to_user(optval, &val, len))
+                rc = -EFAULT;
+out:
+        release_sock(sk);
+        return rc;
+}
+
+static struct net_proto_family llc_ui_family_ops = {
+        .family = PF_LLC,
+        .create = llc_ui_create,
+        .owner  = THIS_MODULE,
+};
+
+static struct proto_ops llc_ui_ops = {
+        .family      = PF_LLC,
+        .owner       = THIS_MODULE,
+        .release     = llc_ui_release,
+        .bind        = llc_ui_bind,
+        .connect     = llc_ui_connect,
+        .socketpair  = sock_no_socketpair,
+        .accept      = llc_ui_accept,
+        .getname     = llc_ui_getname,
+        .poll        = datagram_poll,
+        .ioctl       = llc_ui_ioctl,
+        .listen      = llc_ui_listen,
+        .shutdown    = llc_ui_shutdown,
+        .setsockopt  = llc_ui_setsockopt,
+        .getsockopt  = llc_ui_getsockopt,
+        .sendmsg     = llc_ui_sendmsg,
+        .recvmsg     = llc_ui_recvmsg,
+        .mmap        = sock_no_mmap,
+        .sendpage    = sock_no_sendpage,
+};
+
+extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
+extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
+
+static int __init llc2_init(void)
+{
+        int rc = proto_register(&llc_proto, 0);
+
+        if (rc != 0)
+                goto out;
+
+        llc_build_offset_table();
+        llc_station_init();
+        llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
+        rc = llc_proc_init();
+        if (rc != 0)
+                goto out_unregister_llc_proto;
+        sock_register(&llc_ui_family_ops);
+        llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
+        llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
+out:
+        return rc;
+out_unregister_llc_proto:
+        proto_unregister(&llc_proto);
+        goto out;
+}
+
+static void __exit llc2_exit(void)
+{
+        llc_station_exit();
+        llc_remove_pack(LLC_DEST_SAP);
+        llc_remove_pack(LLC_DEST_CONN);
+        sock_unregister(PF_LLC);
+        llc_proc_exit();
+        proto_unregister(&llc_proto);
+}
+
+module_init(llc2_init);
+module_exit(llc2_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
+MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
+MODULE_ALIAS_NETPROTO(PF_LLC);