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port.c
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port.c
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/*
* net/tipc/port.c: TIPC port code
*
* Copyright (c) 1992-2006, Ericsson AB
* Copyright (c) 2004-2005, 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 "port.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 = kmalloc(sizeof(*p_ptr), GFP_ATOMIC);
if (!p_ptr) {
warn("Port creation failed, no memory\n");
return 0;
}
memset(p_ptr, 0, sizeof(*p_ptr));
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.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;
p_ptr->publ.usr_handle = usr_handle;
INIT_LIST_HEAD(&p_ptr->wait_list);
INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
p_ptr->congested_link = NULL;
p_ptr->max_pkt = MAX_PKT_DEFAULT;
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));
memcpy(rbuf->data + 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 || !p_ptr->publ.connected)
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) {