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port.c

/*
 * net/tipc/port.c: TIPC port code
 *
 * Copyright (c) 1992-2007, Ericsson AB
 * Copyright (c) 2004-2007, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "config.h"
#include "dbg.h"
#include "port.h"
#include "addr.h"
#include "link.h"
#include "node.h"
#include "name_table.h"
#include "user_reg.h"
#include "msg.h"
#include "bcast.h"

/* Connection management: */
#define PROBING_INTERVAL 3600000    /* [ms] => 1 h */
#define CONFIRMED 0
#define PROBING 1

#define MAX_REJECT_SIZE 1024

static struct sk_buff *msg_queue_head = NULL;
static struct sk_buff *msg_queue_tail = NULL;

DEFINE_SPINLOCK(tipc_port_list_lock);
static DEFINE_SPINLOCK(queue_lock);

static LIST_HEAD(ports);
static void port_handle_node_down(unsigned long ref);
static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
static void port_timeout(unsigned long ref);


static u32 port_peernode(struct port *p_ptr)
{
      return msg_destnode(&p_ptr->publ.phdr);
}

static u32 port_peerport(struct port *p_ptr)
{
      return msg_destport(&p_ptr->publ.phdr);
}

static u32 port_out_seqno(struct port *p_ptr)
{
      return msg_transp_seqno(&p_ptr->publ.phdr);
}

static void port_incr_out_seqno(struct port *p_ptr)
{
      struct tipc_msg *m = &p_ptr->publ.phdr;

      if (likely(!msg_routed(m)))
            return;
      msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
}

/**
 * tipc_multicast - send a multicast message to local and remote destinations
 */

int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, u32 domain,
               u32 num_sect, struct iovec const *msg_sect)
{
      struct tipc_msg *hdr;
      struct sk_buff *buf;
      struct sk_buff *ibuf = NULL;
      struct port_list dports = {0, NULL, };
      struct port *oport = tipc_port_deref(ref);
      int ext_targets;
      int res;

      if (unlikely(!oport))
            return -EINVAL;

      /* Create multicast message */

      hdr = &oport->publ.phdr;
      msg_set_type(hdr, TIPC_MCAST_MSG);
      msg_set_nametype(hdr, seq->type);
      msg_set_namelower(hdr, seq->lower);
      msg_set_nameupper(hdr, seq->upper);
      msg_set_hdr_sz(hdr, MCAST_H_SIZE);
      res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
                  !oport->user_port, &buf);
      if (unlikely(!buf))
            return res;

      /* Figure out where to send multicast message */

      ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
                                    TIPC_NODE_SCOPE, &dports);

      /* Send message to destinations (duplicate it only if necessary) */

      if (ext_targets) {
            if (dports.count != 0) {
                  ibuf = skb_copy(buf, GFP_ATOMIC);
                  if (ibuf == NULL) {
                        tipc_port_list_free(&dports);
                        buf_discard(buf);
                        return -ENOMEM;
                  }
            }
            res = tipc_bclink_send_msg(buf);
            if ((res < 0) && (dports.count != 0)) {
                  buf_discard(ibuf);
            }
      } else {
            ibuf = buf;
      }

      if (res >= 0) {
            if (ibuf)
                  tipc_port_recv_mcast(ibuf, &dports);
      } else {
            tipc_port_list_free(&dports);
      }
      return res;
}

/**
 * tipc_port_recv_mcast - deliver multicast message to all destination ports
 *
 * If there is no port list, perform a lookup to create one
 */

void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
{
      struct tipc_msg* msg;
      struct port_list dports = {0, NULL, };
      struct port_list *item = dp;
      int cnt = 0;

      msg = buf_msg(buf);

      /* Create destination port list, if one wasn't supplied */

      if (dp == NULL) {
            tipc_nametbl_mc_translate(msg_nametype(msg),
                             msg_namelower(msg),
                             msg_nameupper(msg),
                             TIPC_CLUSTER_SCOPE,
                             &dports);
            item = dp = &dports;
      }

      /* Deliver a copy of message to each destination port */

      if (dp->count != 0) {
            if (dp->count == 1) {
                  msg_set_destport(msg, dp->ports[0]);
                  tipc_port_recv_msg(buf);
                  tipc_port_list_free(dp);
                  return;
            }
            for (; cnt < dp->count; cnt++) {
                  int index = cnt % PLSIZE;
                  struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);

                  if (b == NULL) {
                        warn("Unable to deliver multicast message(s)\n");
                        msg_dbg(msg, "LOST:");
                        goto exit;
                  }
                  if ((index == 0) && (cnt != 0)) {
                        item = item->next;
                  }
                  msg_set_destport(buf_msg(b),item->ports[index]);
                  tipc_port_recv_msg(b);
            }
      }
exit:
      buf_discard(buf);
      tipc_port_list_free(dp);
}

/**
 * tipc_createport_raw - create a native TIPC port
 *
 * Returns local port reference
 */

u32 tipc_createport_raw(void *usr_handle,
                  u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
                  void (*wakeup)(struct tipc_port *),
                  const u32 importance)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      u32 ref;

      p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
      if (!p_ptr) {
            warn("Port creation failed, no memory\n");
            return 0;
      }
      ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
      if (!ref) {
            warn("Port creation failed, reference table exhausted\n");
            kfree(p_ptr);
            return 0;
      }

      tipc_port_lock(ref);
      p_ptr->publ.usr_handle = usr_handle;
      p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
      p_ptr->publ.ref = ref;
      msg = &p_ptr->publ.phdr;
      msg_init(msg, DATA_LOW, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE, 0);
      msg_set_orignode(msg, tipc_own_addr);
      msg_set_prevnode(msg, tipc_own_addr);
      msg_set_origport(msg, ref);
      msg_set_importance(msg,importance);
      p_ptr->last_in_seqno = 41;
      p_ptr->sent = 1;
      INIT_LIST_HEAD(&p_ptr->wait_list);
      INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
      p_ptr->congested_link = NULL;
      p_ptr->dispatcher = dispatcher;
      p_ptr->wakeup = wakeup;
      p_ptr->user_port = NULL;
      k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
      spin_lock_bh(&tipc_port_list_lock);
      INIT_LIST_HEAD(&p_ptr->publications);
      INIT_LIST_HEAD(&p_ptr->port_list);
      list_add_tail(&p_ptr->port_list, &ports);
      spin_unlock_bh(&tipc_port_list_lock);
      tipc_port_unlock(p_ptr);
      return ref;
}

int tipc_deleteport(u32 ref)
{
      struct port *p_ptr;
      struct sk_buff *buf = NULL;

      tipc_withdraw(ref, 0, NULL);
      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;

      tipc_ref_discard(ref);
      tipc_port_unlock(p_ptr);

      k_cancel_timer(&p_ptr->timer);
      if (p_ptr->publ.connected) {
            buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
            tipc_nodesub_unsubscribe(&p_ptr->subscription);
      }
      if (p_ptr->user_port) {
            tipc_reg_remove_port(p_ptr->user_port);
            kfree(p_ptr->user_port);
      }

      spin_lock_bh(&tipc_port_list_lock);
      list_del(&p_ptr->port_list);
      list_del(&p_ptr->wait_list);
      spin_unlock_bh(&tipc_port_list_lock);
      k_term_timer(&p_ptr->timer);
      kfree(p_ptr);
      dbg("Deleted port %u\n", ref);
      tipc_net_route_msg(buf);
      return TIPC_OK;
}

/**
 * tipc_get_port() - return port associated with 'ref'
 *
 * Note: Port is not locked.
 */

struct tipc_port *tipc_get_port(const u32 ref)
{
      return (struct tipc_port *)tipc_ref_deref(ref);
}

/**
 * tipc_get_handle - return user handle associated to port 'ref'
 */

void *tipc_get_handle(const u32 ref)
{
      struct port *p_ptr;
      void * handle;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return NULL;
      handle = p_ptr->publ.usr_handle;
      tipc_port_unlock(p_ptr);
      return handle;
}

static int port_unreliable(struct port *p_ptr)
{
      return msg_src_droppable(&p_ptr->publ.phdr);
}

int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
{
      struct port *p_ptr;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      *isunreliable = port_unreliable(p_ptr);
      spin_unlock_bh(p_ptr->publ.lock);
      return TIPC_OK;
}

int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
{
      struct port *p_ptr;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
      tipc_port_unlock(p_ptr);
      return TIPC_OK;
}

static int port_unreturnable(struct port *p_ptr)
{
      return msg_dest_droppable(&p_ptr->publ.phdr);
}

int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
{
      struct port *p_ptr;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      *isunrejectable = port_unreturnable(p_ptr);
      spin_unlock_bh(p_ptr->publ.lock);
      return TIPC_OK;
}

int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
{
      struct port *p_ptr;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
      tipc_port_unlock(p_ptr);
      return TIPC_OK;
}

/*
 * port_build_proto_msg(): build a port level protocol
 * or a connection abortion message. Called with
 * tipc_port lock on.
 */
static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
                                  u32 origport, u32 orignode,
                                  u32 usr, u32 type, u32 err,
                                  u32 seqno, u32 ack)
{
      struct sk_buff *buf;
      struct tipc_msg *msg;

      buf = buf_acquire(LONG_H_SIZE);
      if (buf) {
            msg = buf_msg(buf);
            msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
            msg_set_destport(msg, destport);
            msg_set_origport(msg, origport);
            msg_set_destnode(msg, destnode);
            msg_set_orignode(msg, orignode);
            msg_set_transp_seqno(msg, seqno);
            msg_set_msgcnt(msg, ack);
            msg_dbg(msg, "PORT>SEND>:");
      }
      return buf;
}

int tipc_set_msg_option(struct tipc_port *tp_ptr, const char *opt, const u32 sz)
{
      msg_expand(&tp_ptr->phdr, msg_destnode(&tp_ptr->phdr));
      msg_set_options(&tp_ptr->phdr, opt, sz);
      return TIPC_OK;
}

int tipc_reject_msg(struct sk_buff *buf, u32 err)
{
      struct tipc_msg *msg = buf_msg(buf);
      struct sk_buff *rbuf;
      struct tipc_msg *rmsg;
      int hdr_sz;
      u32 imp = msg_importance(msg);
      u32 data_sz = msg_data_sz(msg);

      if (data_sz > MAX_REJECT_SIZE)
            data_sz = MAX_REJECT_SIZE;
      if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
            imp++;
      msg_dbg(msg, "port->rej: ");

      /* discard rejected message if it shouldn't be returned to sender */
      if (msg_errcode(msg) || msg_dest_droppable(msg)) {
            buf_discard(buf);
            return data_sz;
      }

      /* construct rejected message */
      if (msg_mcast(msg))
            hdr_sz = MCAST_H_SIZE;
      else
            hdr_sz = LONG_H_SIZE;
      rbuf = buf_acquire(data_sz + hdr_sz);
      if (rbuf == NULL) {
            buf_discard(buf);
            return data_sz;
      }
      rmsg = buf_msg(rbuf);
      msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
      msg_set_destport(rmsg, msg_origport(msg));
      msg_set_prevnode(rmsg, tipc_own_addr);
      msg_set_origport(rmsg, msg_destport(msg));
      if (msg_short(msg))
            msg_set_orignode(rmsg, tipc_own_addr);
      else
            msg_set_orignode(rmsg, msg_destnode(msg));
      msg_set_size(rmsg, data_sz + hdr_sz);
      msg_set_nametype(rmsg, msg_nametype(msg));
      msg_set_nameinst(rmsg, msg_nameinst(msg));
      skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);

      /* send self-abort message when rejecting on a connected port */
      if (msg_connected(msg)) {
            struct sk_buff *abuf = NULL;
            struct port *p_ptr = tipc_port_lock(msg_destport(msg));

            if (p_ptr) {
                  if (p_ptr->publ.connected)
                        abuf = port_build_self_abort_msg(p_ptr, err);
                  tipc_port_unlock(p_ptr);
            }
            tipc_net_route_msg(abuf);
      }

      /* send rejected message */
      buf_discard(buf);
      tipc_net_route_msg(rbuf);
      return data_sz;
}

int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
                        struct iovec const *msg_sect, u32 num_sect,
                        int err)
{
      struct sk_buff *buf;
      int res;

      res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
                  !p_ptr->user_port, &buf);
      if (!buf)
            return res;

      return tipc_reject_msg(buf, err);
}

static void port_timeout(unsigned long ref)
{
      struct port *p_ptr = tipc_port_lock(ref);
      struct sk_buff *buf = NULL;

      if (!p_ptr)
            return;

      if (!p_ptr->publ.connected) {
            tipc_port_unlock(p_ptr);
            return;
      }

      /* Last probe answered ? */
      if (p_ptr->probing_state == PROBING) {
            buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
      } else {
            buf = port_build_proto_msg(port_peerport(p_ptr),
                                 port_peernode(p_ptr),
                                 p_ptr->publ.ref,
                                 tipc_own_addr,
                                 CONN_MANAGER,
                                 CONN_PROBE,
                                 TIPC_OK,
                                 port_out_seqno(p_ptr),
                                 0);
            port_incr_out_seqno(p_ptr);
            p_ptr->probing_state = PROBING;
            k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
      }
      tipc_port_unlock(p_ptr);
      tipc_net_route_msg(buf);
}


static void port_handle_node_down(unsigned long ref)
{
      struct port *p_ptr = tipc_port_lock(ref);
      struct sk_buff* buf = NULL;

      if (!p_ptr)
            return;
      buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
      tipc_port_unlock(p_ptr);
      tipc_net_route_msg(buf);
}


static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
{
      u32 imp = msg_importance(&p_ptr->publ.phdr);

      if (!p_ptr->publ.connected)
            return NULL;
      if (imp < TIPC_CRITICAL_IMPORTANCE)
            imp++;
      return port_build_proto_msg(p_ptr->publ.ref,
                            tipc_own_addr,
                            port_peerport(p_ptr),
                            port_peernode(p_ptr),
                            imp,
                            TIPC_CONN_MSG,
                            err,
                            p_ptr->last_in_seqno + 1,
                            0);
}


static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
{
      u32 imp = msg_importance(&p_ptr->publ.phdr);

      if (!p_ptr->publ.connected)
            return NULL;
      if (imp < TIPC_CRITICAL_IMPORTANCE)
            imp++;
      return port_build_proto_msg(port_peerport(p_ptr),
                            port_peernode(p_ptr),
                            p_ptr->publ.ref,
                            tipc_own_addr,
                            imp,
                            TIPC_CONN_MSG,
                            err,
                            port_out_seqno(p_ptr),
                            0);
}

void tipc_port_recv_proto_msg(struct sk_buff *buf)
{
      struct tipc_msg *msg = buf_msg(buf);
      struct port *p_ptr = tipc_port_lock(msg_destport(msg));
      u32 err = TIPC_OK;
      struct sk_buff *r_buf = NULL;
      struct sk_buff *abort_buf = NULL;

      msg_dbg(msg, "PORT<RECV<:");

      if (!p_ptr) {
            err = TIPC_ERR_NO_PORT;
      } else if (p_ptr->publ.connected) {
            if (port_peernode(p_ptr) != msg_orignode(msg))
                  err = TIPC_ERR_NO_PORT;
            if (port_peerport(p_ptr) != msg_origport(msg))
                  err = TIPC_ERR_NO_PORT;
            if (!err && msg_routed(msg)) {
                  u32 seqno = msg_transp_seqno(msg);
                  u32 myno =  ++p_ptr->last_in_seqno;
                  if (seqno != myno) {
                        err = TIPC_ERR_NO_PORT;
                        abort_buf = port_build_self_abort_msg(p_ptr, err);
                  }
            }
            if (msg_type(msg) == CONN_ACK) {
                  int wakeup = tipc_port_congested(p_ptr) &&
                             p_ptr->publ.congested &&
                             p_ptr->wakeup;
                  p_ptr->acked += msg_msgcnt(msg);
                  if (tipc_port_congested(p_ptr))
                        goto exit;
                  p_ptr->publ.congested = 0;
                  if (!wakeup)
                        goto exit;
                  p_ptr->wakeup(&p_ptr->publ);
                  goto exit;
            }
      } else if (p_ptr->publ.published) {
            err = TIPC_ERR_NO_PORT;
      }
      if (err) {
            r_buf = port_build_proto_msg(msg_origport(msg),
                                   msg_orignode(msg),
                                   msg_destport(msg),
                                   tipc_own_addr,
                                   DATA_HIGH,
                                   TIPC_CONN_MSG,
                                   err,
                                   0,
                                   0);
            goto exit;
      }

      /* All is fine */
      if (msg_type(msg) == CONN_PROBE) {
            r_buf = port_build_proto_msg(msg_origport(msg),
                                   msg_orignode(msg),
                                   msg_destport(msg),
                                   tipc_own_addr,
                                   CONN_MANAGER,
                                   CONN_PROBE_REPLY,
                                   TIPC_OK,
                                   port_out_seqno(p_ptr),
                                   0);
      }
      p_ptr->probing_state = CONFIRMED;
      port_incr_out_seqno(p_ptr);
exit:
      if (p_ptr)
            tipc_port_unlock(p_ptr);
      tipc_net_route_msg(r_buf);
      tipc_net_route_msg(abort_buf);
      buf_discard(buf);
}

static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
{
      struct publication *publ;

      if (full_id)
            tipc_printf(buf, "<%u.%u.%u:%u>:",
                      tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
                      tipc_node(tipc_own_addr), p_ptr->publ.ref);
      else
            tipc_printf(buf, "%-10u:", p_ptr->publ.ref);

      if (p_ptr->publ.connected) {
            u32 dport = port_peerport(p_ptr);
            u32 destnode = port_peernode(p_ptr);

            tipc_printf(buf, " connected to <%u.%u.%u:%u>",
                      tipc_zone(destnode), tipc_cluster(destnode),
                      tipc_node(destnode), dport);
            if (p_ptr->publ.conn_type != 0)
                  tipc_printf(buf, " via {%u,%u}",
                            p_ptr->publ.conn_type,
                            p_ptr->publ.conn_instance);
      }
      else if (p_ptr->publ.published) {
            tipc_printf(buf, " bound to");
            list_for_each_entry(publ, &p_ptr->publications, pport_list) {
                  if (publ->lower == publ->upper)
                        tipc_printf(buf, " {%u,%u}", publ->type,
                                  publ->lower);
                  else
                        tipc_printf(buf, " {%u,%u,%u}", publ->type,
                                  publ->lower, publ->upper);
            }
      }
      tipc_printf(buf, "\n");
}

#define MAX_PORT_QUERY 32768

struct sk_buff *tipc_port_get_ports(void)
{
      struct sk_buff *buf;
      struct tlv_desc *rep_tlv;
      struct print_buf pb;
      struct port *p_ptr;
      int str_len;

      buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
      if (!buf)
            return NULL;
      rep_tlv = (struct tlv_desc *)buf->data;

      tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
      spin_lock_bh(&tipc_port_list_lock);
      list_for_each_entry(p_ptr, &ports, port_list) {
            spin_lock_bh(p_ptr->publ.lock);
            port_print(p_ptr, &pb, 0);
            spin_unlock_bh(p_ptr->publ.lock);
      }
      spin_unlock_bh(&tipc_port_list_lock);
      str_len = tipc_printbuf_validate(&pb);

      skb_put(buf, TLV_SPACE(str_len));
      TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);

      return buf;
}

#if 0

#define MAX_PORT_STATS 2000

struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
{
      u32 ref;
      struct port *p_ptr;
      struct sk_buff *buf;
      struct tlv_desc *rep_tlv;
      struct print_buf pb;
      int str_len;

      if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
            return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);

      ref = *(u32 *)TLV_DATA(req_tlv_area);
      ref = ntohl(ref);

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return cfg_reply_error_string("port not found");

      buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
      if (!buf) {
            tipc_port_unlock(p_ptr);
            return NULL;
      }
      rep_tlv = (struct tlv_desc *)buf->data;

      tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
      port_print(p_ptr, &pb, 1);
      /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
      tipc_port_unlock(p_ptr);
      str_len = tipc_printbuf_validate(&pb);

      skb_put(buf, TLV_SPACE(str_len));
      TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);

      return buf;
}

#endif

void tipc_port_reinit(void)
{
      struct port *p_ptr;
      struct tipc_msg *msg;

      spin_lock_bh(&tipc_port_list_lock);
      list_for_each_entry(p_ptr, &ports, port_list) {
            msg = &p_ptr->publ.phdr;
            if (msg_orignode(msg) == tipc_own_addr)
                  break;
            msg_set_orignode(msg, tipc_own_addr);
      }
      spin_unlock_bh(&tipc_port_list_lock);
}


/*
 *  port_dispatcher_sigh(): Signal handler for messages destinated
 *                          to the tipc_port interface.
 */

static void port_dispatcher_sigh(void *dummy)
{
      struct sk_buff *buf;

      spin_lock_bh(&queue_lock);
      buf = msg_queue_head;
      msg_queue_head = NULL;
      spin_unlock_bh(&queue_lock);

      while (buf) {
            struct port *p_ptr;
            struct user_port *up_ptr;
            struct tipc_portid orig;
            struct tipc_name_seq dseq;
            void *usr_handle;
            int connected;
            int published;
            u32 message_type;

            struct sk_buff *next = buf->next;
            struct tipc_msg *msg = buf_msg(buf);
            u32 dref = msg_destport(msg);

            message_type = msg_type(msg);
            if (message_type > TIPC_DIRECT_MSG)
                  goto reject;      /* Unsupported message type */

            p_ptr = tipc_port_lock(dref);
            if (!p_ptr)
                  goto reject;      /* Port deleted while msg in queue */

            orig.ref = msg_origport(msg);
            orig.node = msg_orignode(msg);
            up_ptr = p_ptr->user_port;
            usr_handle = up_ptr->usr_handle;
            connected = p_ptr->publ.connected;
            published = p_ptr->publ.published;

            if (unlikely(msg_errcode(msg)))
                  goto err;

            switch (message_type) {

            case TIPC_CONN_MSG:{
                        tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
                        u32 peer_port = port_peerport(p_ptr);
                        u32 peer_node = port_peernode(p_ptr);

                        spin_unlock_bh(p_ptr->publ.lock);
                        if (unlikely(!connected)) {
                              if (unlikely(published))
                                    goto reject;
                              tipc_connect2port(dref,&orig);
                        }
                        if (unlikely(msg_origport(msg) != peer_port))
                              goto reject;
                        if (unlikely(msg_orignode(msg) != peer_node))
                              goto reject;
                        if (unlikely(!cb))
                              goto reject;
                        if (unlikely(++p_ptr->publ.conn_unacked >=
                                   TIPC_FLOW_CONTROL_WIN))
                              tipc_acknowledge(dref,
                                           p_ptr->publ.conn_unacked);
                        skb_pull(buf, msg_hdr_sz(msg));
                        cb(usr_handle, dref, &buf, msg_data(msg),
                           msg_data_sz(msg));
                        break;
                  }
            case TIPC_DIRECT_MSG:{
                        tipc_msg_event cb = up_ptr->msg_cb;

                        spin_unlock_bh(p_ptr->publ.lock);
                        if (unlikely(connected))
                              goto reject;
                        if (unlikely(!cb))
                              goto reject;
                        skb_pull(buf, msg_hdr_sz(msg));
                        cb(usr_handle, dref, &buf, msg_data(msg),
                           msg_data_sz(msg), msg_importance(msg),
                           &orig);
                        break;
                  }
            case TIPC_MCAST_MSG:
            case TIPC_NAMED_MSG:{
                        tipc_named_msg_event cb = up_ptr->named_msg_cb;

                        spin_unlock_bh(p_ptr->publ.lock);
                        if (unlikely(connected))
                              goto reject;
                        if (unlikely(!cb))
                              goto reject;
                        if (unlikely(!published))
                              goto reject;
                        dseq.type =  msg_nametype(msg);
                        dseq.lower = msg_nameinst(msg);
                        dseq.upper = (message_type == TIPC_NAMED_MSG)
                              ? dseq.lower : msg_nameupper(msg);
                        skb_pull(buf, msg_hdr_sz(msg));
                        cb(usr_handle, dref, &buf, msg_data(msg),
                           msg_data_sz(msg), msg_importance(msg),
                           &orig, &dseq);
                        break;
                  }
            }
            if (buf)
                  buf_discard(buf);
            buf = next;
            continue;
err:
            switch (message_type) {

            case TIPC_CONN_MSG:{
                        tipc_conn_shutdown_event cb =
                              up_ptr->conn_err_cb;
                        u32 peer_port = port_peerport(p_ptr);
                        u32 peer_node = port_peernode(p_ptr);

                        spin_unlock_bh(p_ptr->publ.lock);
                        if (!connected || !cb)
                              break;
                        if (msg_origport(msg) != peer_port)
                              break;
                        if (msg_orignode(msg) != peer_node)
                              break;
                        tipc_disconnect(dref);
                        skb_pull(buf, msg_hdr_sz(msg));
                        cb(usr_handle, dref, &buf, msg_data(msg),
                           msg_data_sz(msg), msg_errcode(msg));
                        break;
                  }
            case TIPC_DIRECT_MSG:{
                        tipc_msg_err_event cb = up_ptr->err_cb;

                        spin_unlock_bh(p_ptr->publ.lock);
                        if (connected || !cb)
                              break;
                        skb_pull(buf, msg_hdr_sz(msg));
                        cb(usr_handle, dref, &buf, msg_data(msg),
                           msg_data_sz(msg), msg_errcode(msg), &orig);
                        break;
                  }
            case TIPC_MCAST_MSG:
            case TIPC_NAMED_MSG:{
                        tipc_named_msg_err_event cb =
                              up_ptr->named_err_cb;

                        spin_unlock_bh(p_ptr->publ.lock);
                        if (connected || !cb)
                              break;
                        dseq.type =  msg_nametype(msg);
                        dseq.lower = msg_nameinst(msg);
                        dseq.upper = (message_type == TIPC_NAMED_MSG)
                              ? dseq.lower : msg_nameupper(msg);
                        skb_pull(buf, msg_hdr_sz(msg));
                        cb(usr_handle, dref, &buf, msg_data(msg),
                           msg_data_sz(msg), msg_errcode(msg), &dseq);
                        break;
                  }
            }
            if (buf)
                  buf_discard(buf);
            buf = next;
            continue;
reject:
            tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
            buf = next;
      }
}

/*
 *  port_dispatcher(): Dispatcher for messages destinated
 *  to the tipc_port interface. Called with port locked.
 */

static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
{
      buf->next = NULL;
      spin_lock_bh(&queue_lock);
      if (msg_queue_head) {
            msg_queue_tail->next = buf;
            msg_queue_tail = buf;
      } else {
            msg_queue_tail = msg_queue_head = buf;
            tipc_k_signal((Handler)port_dispatcher_sigh, 0);
      }
      spin_unlock_bh(&queue_lock);
      return TIPC_OK;
}

/*
 * Wake up port after congestion: Called with port locked,
 *
 */

static void port_wakeup_sh(unsigned long ref)
{
      struct port *p_ptr;
      struct user_port *up_ptr;
      tipc_continue_event cb = NULL;
      void *uh = NULL;

      p_ptr = tipc_port_lock(ref);
      if (p_ptr) {
            up_ptr = p_ptr->user_port;
            if (up_ptr) {
                  cb = up_ptr->continue_event_cb;
                  uh = up_ptr->usr_handle;
            }
            tipc_port_unlock(p_ptr);
      }
      if (cb)
            cb(uh, ref);
}


static void port_wakeup(struct tipc_port *p_ptr)
{
      tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
}

void tipc_acknowledge(u32 ref, u32 ack)
{
      struct port *p_ptr;
      struct sk_buff *buf = NULL;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return;
      if (p_ptr->publ.connected) {
            p_ptr->publ.conn_unacked -= ack;
            buf = port_build_proto_msg(port_peerport(p_ptr),
                                 port_peernode(p_ptr),
                                 ref,
                                 tipc_own_addr,
                                 CONN_MANAGER,
                                 CONN_ACK,
                                 TIPC_OK,
                                 port_out_seqno(p_ptr),
                                 ack);
      }
      tipc_port_unlock(p_ptr);
      tipc_net_route_msg(buf);
}

/*
 * tipc_createport(): user level call. Will add port to
 *                    registry if non-zero user_ref.
 */

int tipc_createport(u32 user_ref,
                void *usr_handle,
                unsigned int importance,
                tipc_msg_err_event error_cb,
                tipc_named_msg_err_event named_error_cb,
                tipc_conn_shutdown_event conn_error_cb,
                tipc_msg_event msg_cb,
                tipc_named_msg_event named_msg_cb,
                tipc_conn_msg_event conn_msg_cb,
                tipc_continue_event continue_event_cb,/* May be zero */
                u32 *portref)
{
      struct user_port *up_ptr;
      struct port *p_ptr;
      u32 ref;

      up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
      if (!up_ptr) {
            warn("Port creation failed, no memory\n");
            return -ENOMEM;
      }
      ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
      p_ptr = tipc_port_lock(ref);
      if (!p_ptr) {
            kfree(up_ptr);
            return -ENOMEM;
      }

      p_ptr->user_port = up_ptr;
      up_ptr->user_ref = user_ref;
      up_ptr->usr_handle = usr_handle;
      up_ptr->ref = p_ptr->publ.ref;
      up_ptr->err_cb = error_cb;
      up_ptr->named_err_cb = named_error_cb;
      up_ptr->conn_err_cb = conn_error_cb;
      up_ptr->msg_cb = msg_cb;
      up_ptr->named_msg_cb = named_msg_cb;
      up_ptr->conn_msg_cb = conn_msg_cb;
      up_ptr->continue_event_cb = continue_event_cb;
      INIT_LIST_HEAD(&up_ptr->uport_list);
      tipc_reg_add_port(up_ptr);
      *portref = p_ptr->publ.ref;
      dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
      tipc_port_unlock(p_ptr);
      return TIPC_OK;
}

int tipc_ownidentity(u32 ref, struct tipc_portid *id)
{
      id->ref = ref;
      id->node = tipc_own_addr;
      return TIPC_OK;
}

int tipc_portimportance(u32 ref, unsigned int *importance)
{
      struct port *p_ptr;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
      spin_unlock_bh(p_ptr->publ.lock);
      return TIPC_OK;
}

int tipc_set_portimportance(u32 ref, unsigned int imp)
{
      struct port *p_ptr;

      if (imp > TIPC_CRITICAL_IMPORTANCE)
            return -EINVAL;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
      spin_unlock_bh(p_ptr->publ.lock);
      return TIPC_OK;
}


int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
{
      struct port *p_ptr;
      struct publication *publ;
      u32 key;
      int res = -EINVAL;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;

      dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
          "lower = %u, upper = %u\n",
          ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
      if (p_ptr->publ.connected)
            goto exit;
      if (seq->lower > seq->upper)
            goto exit;
      if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
            goto exit;
      key = ref + p_ptr->pub_count + 1;
      if (key == ref) {
            res = -EADDRINUSE;
            goto exit;
      }
      publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
                            scope, p_ptr->publ.ref, key);
      if (publ) {
            list_add(&publ->pport_list, &p_ptr->publications);
            p_ptr->pub_count++;
            p_ptr->publ.published = 1;
            res = TIPC_OK;
      }
exit:
      tipc_port_unlock(p_ptr);
      return res;
}

int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
{
      struct port *p_ptr;
      struct publication *publ;
      struct publication *tpubl;
      int res = -EINVAL;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      if (!seq) {
            list_for_each_entry_safe(publ, tpubl,
                               &p_ptr->publications, pport_list) {
                  tipc_nametbl_withdraw(publ->type, publ->lower,
                                    publ->ref, publ->key);
            }
            res = TIPC_OK;
      } else {
            list_for_each_entry_safe(publ, tpubl,
                               &p_ptr->publications, pport_list) {
                  if (publ->scope != scope)
                        continue;
                  if (publ->type != seq->type)
                        continue;
                  if (publ->lower != seq->lower)
                        continue;
                  if (publ->upper != seq->upper)
                        break;
                  tipc_nametbl_withdraw(publ->type, publ->lower,
                                    publ->ref, publ->key);
                  res = TIPC_OK;
                  break;
            }
      }
      if (list_empty(&p_ptr->publications))
            p_ptr->publ.published = 0;
      tipc_port_unlock(p_ptr);
      return res;
}

int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      int res = -EINVAL;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      if (p_ptr->publ.published || p_ptr->publ.connected)
            goto exit;
      if (!peer->ref)
            goto exit;

      msg = &p_ptr->publ.phdr;
      msg_set_destnode(msg, peer->node);
      msg_set_destport(msg, peer->ref);
      msg_set_orignode(msg, tipc_own_addr);
      msg_set_origport(msg, p_ptr->publ.ref);
      msg_set_transp_seqno(msg, 42);
      msg_set_type(msg, TIPC_CONN_MSG);
      if (!may_route(peer->node))
            msg_set_hdr_sz(msg, SHORT_H_SIZE);
      else
            msg_set_hdr_sz(msg, LONG_H_SIZE);

      p_ptr->probing_interval = PROBING_INTERVAL;
      p_ptr->probing_state = CONFIRMED;
      p_ptr->publ.connected = 1;
      k_start_timer(&p_ptr->timer, p_ptr->probing_interval);

      tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
                    (void *)(unsigned long)ref,
                    (net_ev_handler)port_handle_node_down);
      res = TIPC_OK;
exit:
      tipc_port_unlock(p_ptr);
      p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
      return res;
}

/*
 * tipc_disconnect(): Disconnect port form peer.
 *                    This is a node local operation.
 */

int tipc_disconnect(u32 ref)
{
      struct port *p_ptr;
      int res = -ENOTCONN;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      if (p_ptr->publ.connected) {
            p_ptr->publ.connected = 0;
            /* let timer expire on it's own to avoid deadlock! */
            tipc_nodesub_unsubscribe(&p_ptr->subscription);
            res = TIPC_OK;
      }
      tipc_port_unlock(p_ptr);
      return res;
}

/*
 * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
 */
int tipc_shutdown(u32 ref)
{
      struct port *p_ptr;
      struct sk_buff *buf = NULL;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;

      if (p_ptr->publ.connected) {
            u32 imp = msg_importance(&p_ptr->publ.phdr);
            if (imp < TIPC_CRITICAL_IMPORTANCE)
                  imp++;
            buf = port_build_proto_msg(port_peerport(p_ptr),
                                 port_peernode(p_ptr),
                                 ref,
                                 tipc_own_addr,
                                 imp,
                                 TIPC_CONN_MSG,
                                 TIPC_CONN_SHUTDOWN,
                                 port_out_seqno(p_ptr),
                                 0);
      }
      tipc_port_unlock(p_ptr);
      tipc_net_route_msg(buf);
      return tipc_disconnect(ref);
}

int tipc_isconnected(u32 ref, int *isconnected)
{
      struct port *p_ptr;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      *isconnected = p_ptr->publ.connected;
      tipc_port_unlock(p_ptr);
      return TIPC_OK;
}

int tipc_peer(u32 ref, struct tipc_portid *peer)
{
      struct port *p_ptr;
      int res;

      p_ptr = tipc_port_lock(ref);
      if (!p_ptr)
            return -EINVAL;
      if (p_ptr->publ.connected) {
            peer->ref = port_peerport(p_ptr);
            peer->node = port_peernode(p_ptr);
            res = TIPC_OK;
      } else
            res = -ENOTCONN;
      tipc_port_unlock(p_ptr);
      return res;
}

int tipc_ref_valid(u32 ref)
{
      /* Works irrespective of type */
      return !!tipc_ref_deref(ref);
}


/*
 *  tipc_port_recv_sections(): Concatenate and deliver sectioned
 *                        message for this node.
 */

int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
                   struct iovec const *msg_sect)
{
      struct sk_buff *buf;
      int res;

      res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
                  MAX_MSG_SIZE, !sender->user_port, &buf);
      if (likely(buf))
            tipc_port_recv_msg(buf);
      return res;
}

/**
 * tipc_send - send message sections on connection
 */

int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
{
      struct port *p_ptr;
      u32 destnode;
      int res;

      p_ptr = tipc_port_deref(ref);
      if (!p_ptr || !p_ptr->publ.connected)
            return -EINVAL;

      p_ptr->publ.congested = 1;
      if (!tipc_port_congested(p_ptr)) {
            destnode = port_peernode(p_ptr);
            if (likely(destnode != tipc_own_addr))
                  res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
                                             destnode);
            else
                  res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);

            if (likely(res != -ELINKCONG)) {
                  port_incr_out_seqno(p_ptr);
                  p_ptr->publ.congested = 0;
                  p_ptr->sent++;
                  return res;
            }
      }
      if (port_unreliable(p_ptr)) {
            p_ptr->publ.congested = 0;
            /* Just calculate msg length and return */
            return msg_calc_data_size(msg_sect, num_sect);
      }
      return -ELINKCONG;
}

/**
 * tipc_send_buf - send message buffer on connection
 */

int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      u32 destnode;
      u32 hsz;
      u32 sz;
      u32 res;

      p_ptr = tipc_port_deref(ref);
      if (!p_ptr || !p_ptr->publ.connected)
            return -EINVAL;

      msg = &p_ptr->publ.phdr;
      hsz = msg_hdr_sz(msg);
      sz = hsz + dsz;
      msg_set_size(msg, sz);
      if (skb_cow(buf, hsz))
            return -ENOMEM;

      skb_push(buf, hsz);
      skb_copy_to_linear_data(buf, msg, hsz);
      destnode = msg_destnode(msg);
      p_ptr->publ.congested = 1;
      if (!tipc_port_congested(p_ptr)) {
            if (likely(destnode != tipc_own_addr))
                  res = tipc_send_buf_fast(buf, destnode);
            else {
                  tipc_port_recv_msg(buf);
                  res = sz;
            }
            if (likely(res != -ELINKCONG)) {
                  port_incr_out_seqno(p_ptr);
                  p_ptr->sent++;
                  p_ptr->publ.congested = 0;
                  return res;
            }
      }
      if (port_unreliable(p_ptr)) {
            p_ptr->publ.congested = 0;
            return dsz;
      }
      return -ELINKCONG;
}

/**
 * tipc_forward2name - forward message sections to port name
 */

int tipc_forward2name(u32 ref,
                  struct tipc_name const *name,
                  u32 domain,
                  u32 num_sect,
                  struct iovec const *msg_sect,
                  struct tipc_portid const *orig,
                  unsigned int importance)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      u32 destnode = domain;
      u32 destport = 0;
      int res;

      p_ptr = tipc_port_deref(ref);
      if (!p_ptr || p_ptr->publ.connected)
            return -EINVAL;

      msg = &p_ptr->publ.phdr;
      msg_set_type(msg, TIPC_NAMED_MSG);
      msg_set_orignode(msg, orig->node);
      msg_set_origport(msg, orig->ref);
      msg_set_hdr_sz(msg, LONG_H_SIZE);
      msg_set_nametype(msg, name->type);
      msg_set_nameinst(msg, name->instance);
      msg_set_lookup_scope(msg, addr_scope(domain));
      if (importance <= TIPC_CRITICAL_IMPORTANCE)
            msg_set_importance(msg,importance);
      destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
      msg_set_destnode(msg, destnode);
      msg_set_destport(msg, destport);

      if (likely(destport || destnode)) {
            p_ptr->sent++;
            if (likely(destnode == tipc_own_addr))
                  return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
            res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
                                       destnode);
            if (likely(res != -ELINKCONG))
                  return res;
            if (port_unreliable(p_ptr)) {
                  /* Just calculate msg length and return */
                  return msg_calc_data_size(msg_sect, num_sect);
            }
            return -ELINKCONG;
      }
      return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
                               TIPC_ERR_NO_NAME);
}

/**
 * tipc_send2name - send message sections to port name
 */

int tipc_send2name(u32 ref,
               struct tipc_name const *name,
               unsigned int domain,
               unsigned int num_sect,
               struct iovec const *msg_sect)
{
      struct tipc_portid orig;

      orig.ref = ref;
      orig.node = tipc_own_addr;
      return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
                         TIPC_PORT_IMPORTANCE);
}

/**
 * tipc_forward_buf2name - forward message buffer to port name
 */

int tipc_forward_buf2name(u32 ref,
                    struct tipc_name const *name,
                    u32 domain,
                    struct sk_buff *buf,
                    unsigned int dsz,
                    struct tipc_portid const *orig,
                    unsigned int importance)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      u32 destnode = domain;
      u32 destport = 0;
      int res;

      p_ptr = (struct port *)tipc_ref_deref(ref);
      if (!p_ptr || p_ptr->publ.connected)
            return -EINVAL;

      msg = &p_ptr->publ.phdr;
      if (importance <= TIPC_CRITICAL_IMPORTANCE)
            msg_set_importance(msg, importance);
      msg_set_type(msg, TIPC_NAMED_MSG);
      msg_set_orignode(msg, orig->node);
      msg_set_origport(msg, orig->ref);
      msg_set_nametype(msg, name->type);
      msg_set_nameinst(msg, name->instance);
      msg_set_lookup_scope(msg, addr_scope(domain));
      msg_set_hdr_sz(msg, LONG_H_SIZE);
      msg_set_size(msg, LONG_H_SIZE + dsz);
      destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
      msg_set_destnode(msg, destnode);
      msg_set_destport(msg, destport);
      msg_dbg(msg, "forw2name ==> ");
      if (skb_cow(buf, LONG_H_SIZE))
            return -ENOMEM;
      skb_push(buf, LONG_H_SIZE);
      skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
      msg_dbg(buf_msg(buf),"PREP:");
      if (likely(destport || destnode)) {
            p_ptr->sent++;
            if (destnode == tipc_own_addr)
                  return tipc_port_recv_msg(buf);
            res = tipc_send_buf_fast(buf, destnode);
            if (likely(res != -ELINKCONG))
                  return res;
            if (port_unreliable(p_ptr))
                  return dsz;
            return -ELINKCONG;
      }
      return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
}

/**
 * tipc_send_buf2name - send message buffer to port name
 */

int tipc_send_buf2name(u32 ref,
                   struct tipc_name const *dest,
                   u32 domain,
                   struct sk_buff *buf,
                   unsigned int dsz)
{
      struct tipc_portid orig;

      orig.ref = ref;
      orig.node = tipc_own_addr;
      return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
                             TIPC_PORT_IMPORTANCE);
}

/**
 * tipc_forward2port - forward message sections to port identity
 */

int tipc_forward2port(u32 ref,
                  struct tipc_portid const *dest,
                  unsigned int num_sect,
                  struct iovec const *msg_sect,
                  struct tipc_portid const *orig,
                  unsigned int importance)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      int res;

      p_ptr = tipc_port_deref(ref);
      if (!p_ptr || p_ptr->publ.connected)
            return -EINVAL;

      msg = &p_ptr->publ.phdr;
      msg_set_type(msg, TIPC_DIRECT_MSG);
      msg_set_orignode(msg, orig->node);
      msg_set_origport(msg, orig->ref);
      msg_set_destnode(msg, dest->node);
      msg_set_destport(msg, dest->ref);
      msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
      if (importance <= TIPC_CRITICAL_IMPORTANCE)
            msg_set_importance(msg, importance);
      p_ptr->sent++;
      if (dest->node == tipc_own_addr)
            return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
      res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
      if (likely(res != -ELINKCONG))
            return res;
      if (port_unreliable(p_ptr)) {
            /* Just calculate msg length and return */
            return msg_calc_data_size(msg_sect, num_sect);
      }
      return -ELINKCONG;
}

/**
 * tipc_send2port - send message sections to port identity
 */

int tipc_send2port(u32 ref,
               struct tipc_portid const *dest,
               unsigned int num_sect,
               struct iovec const *msg_sect)
{
      struct tipc_portid orig;

      orig.ref = ref;
      orig.node = tipc_own_addr;
      return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
                         TIPC_PORT_IMPORTANCE);
}

/**
 * tipc_forward_buf2port - forward message buffer to port identity
 */
int tipc_forward_buf2port(u32 ref,
                    struct tipc_portid const *dest,
                    struct sk_buff *buf,
                    unsigned int dsz,
                    struct tipc_portid const *orig,
                    unsigned int importance)
{
      struct port *p_ptr;
      struct tipc_msg *msg;
      int res;

      p_ptr = (struct port *)tipc_ref_deref(ref);
      if (!p_ptr || p_ptr->publ.connected)
            return -EINVAL;

      msg = &p_ptr->publ.phdr;
      msg_set_type(msg, TIPC_DIRECT_MSG);
      msg_set_orignode(msg, orig->node);
      msg_set_origport(msg, orig->ref);
      msg_set_destnode(msg, dest->node);
      msg_set_destport(msg, dest->ref);
      msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
      if (importance <= TIPC_CRITICAL_IMPORTANCE)
            msg_set_importance(msg, importance);
      msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
      if (skb_cow(buf, DIR_MSG_H_SIZE))
            return -ENOMEM;

      skb_push(buf, DIR_MSG_H_SIZE);
      skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
      msg_dbg(msg, "buf2port: ");
      p_ptr->sent++;
      if (dest->node == tipc_own_addr)
            return tipc_port_recv_msg(buf);
      res = tipc_send_buf_fast(buf, dest->node);
      if (likely(res != -ELINKCONG))
            return res;
      if (port_unreliable(p_ptr))
            return dsz;
      return -ELINKCONG;
}

/**
 * tipc_send_buf2port - send message buffer to port identity
 */

int tipc_send_buf2port(u32 ref,
                   struct tipc_portid const *dest,
                   struct sk_buff *buf,
                   unsigned int dsz)
{
      struct tipc_portid orig;

      orig.ref = ref;
      orig.node = tipc_own_addr;
      return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
                             TIPC_PORT_IMPORTANCE);
}


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