- 根目录:
- net
- tipc
- port.c
/*
* net/tipc/port.c: TIPC port code
*
* Copyright (c) 1992-2007, Ericsson AB
* Copyright (c) 2004-2008, 2010-2013, 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 "port.h"
#include "name_table.h"
/* Connection management: */
#define PROBING_INTERVAL 3600000 /* [ms] => 1 h */
#define CONFIRMED 0
#define PROBING 1
#define MAX_REJECT_SIZE 1024
DEFINE_SPINLOCK(tipc_port_list_lock);
static LIST_HEAD(ports);
static void port_handle_node_down(unsigned long ref);
static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
static void port_timeout(unsigned long ref);
static u32 port_peernode(struct tipc_port *p_ptr)
{
return msg_destnode(&p_ptr->phdr);
}
static u32 port_peerport(struct tipc_port *p_ptr)
{
return msg_destport(&p_ptr->phdr);
}
/**
* tipc_port_peer_msg - verify message was sent by connected port's peer
*
* Handles cases where the node's network address has changed from
* the default of <0.0.0> to its configured setting.
*/
int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
{
u32 peernode;
u32 orignode;
if (msg_origport(msg) != port_peerport(p_ptr))
return 0;
orignode = msg_orignode(msg);
peernode = port_peernode(p_ptr);
return (orignode == peernode) ||
(!orignode && (peernode == tipc_own_addr)) ||
(!peernode && (orignode == tipc_own_addr));
}
/**
* tipc_multicast - send a multicast message to local and remote destinations
*/
int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
struct iovec const *msg_sect, unsigned int len)
{
struct tipc_msg *hdr;
struct sk_buff *buf;
struct sk_buff *ibuf = NULL;
struct tipc_port_list dports = {0, NULL, };
struct tipc_port *oport = tipc_port_deref(ref);
int ext_targets;
int res;
if (unlikely(!oport))
return -EINVAL;
/* Create multicast message */
hdr = &oport->phdr;
msg_set_type(hdr, TIPC_MCAST_MSG);
msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
msg_set_destport(hdr, 0);
msg_set_destnode(hdr, 0);
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 = tipc_msg_build(hdr, msg_sect, len, MAX_MSG_SIZE, &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);
kfree_skb(buf);
return -ENOMEM;
}
}
res = tipc_bclink_send_msg(buf);
if ((res < 0) && (dports.count != 0))
kfree_skb(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 tipc_port_list *dp)
{
struct tipc_msg *msg;
struct tipc_port_list dports = {0, NULL, };
struct tipc_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) {
msg_set_destnode(msg, tipc_own_addr);
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) {
pr_warn("Unable to deliver multicast message(s)\n");
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:
kfree_skb(buf);
tipc_port_list_free(dp);
}
/**
* tipc_createport - create a generic TIPC port
*
* Returns pointer to (locked) TIPC port, or NULL if unable to create it
*/
struct tipc_port *tipc_createport(struct sock *sk,
u32 (*dispatcher)(struct tipc_port *,
struct sk_buff *),
void (*wakeup)(struct tipc_port *),
const u32 importance)
{
struct tipc_port *p_ptr;
struct tipc_msg *msg;
u32 ref;
p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
if (!p_ptr) {
pr_warn("Port creation failed, no memory\n");
return NULL;
}
ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
if (!ref) {
pr_warn("Port creation failed, ref. table exhausted\n");
kfree(p_ptr);
return NULL;
}
p_ptr->sk = sk;
p_ptr->max_pkt = MAX_PKT_DEFAULT;
p_ptr->ref = ref;
INIT_LIST_HEAD(&p_ptr->wait_list);
INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
p_ptr->dispatcher = dispatcher;
p_ptr->wakeup = wakeup;
k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
INIT_LIST_HEAD(&p_ptr->publications);
INIT_LIST_HEAD(&p_ptr->port_list);
/*
* Must hold port list lock while initializing message header template
* to ensure a change to node's own network address doesn't result
* in template containing out-dated network address information
*/
spin_lock_bh(&tipc_port_list_lock);
msg = &p_ptr->phdr;
tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
msg_set_origport(msg, ref);
list_add_tail(&p_ptr->port_list, &ports);
spin_unlock_bh(&tipc_port_list_lock);
return p_ptr;
}
int tipc_deleteport(struct tipc_port *p_ptr)
{
struct sk_buff *buf = NULL;
tipc_withdraw(p_ptr, 0, NULL);
spin_lock_bh(p_ptr->lock);
tipc_ref_discard(p_ptr->ref);
spin_unlock_bh(p_ptr->lock);
k_cancel_timer(&p_ptr->timer);
if (p_ptr->connected) {
buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
tipc_nodesub_unsubscribe(&p_ptr->subscription);
}
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);
tipc_net_route_msg(buf);
return 0;
}
static int port_unreliable(struct tipc_port *p_ptr)
{
return msg_src_droppable(&p_ptr->phdr);
}
int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
{
struct tipc_port *p_ptr;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
*isunreliable = port_unreliable(p_ptr);
tipc_port_unlock(p_ptr);
return 0;
}
int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
{
struct tipc_port *p_ptr;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
tipc_port_unlock(p_ptr);
return 0;
}
static int port_unreturnable(struct tipc_port *p_ptr)
{
return msg_dest_droppable(&p_ptr->phdr);
}
int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
{
struct tipc_port *p_ptr;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
*isunrejectable = port_unreturnable(p_ptr);
tipc_port_unlock(p_ptr);
return 0;
}
int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
{
struct tipc_port *p_ptr;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
tipc_port_unlock(p_ptr);
return 0;
}
/*
* port_build_proto_msg(): create connection protocol message for port
*
* On entry the port must be locked and connected.
*/
static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
u32 type, u32 ack)
{
struct sk_buff *buf;
struct tipc_msg *msg;
buf = tipc_buf_acquire(INT_H_SIZE);
if (buf) {
msg = buf_msg(buf);
tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
port_peernode(p_ptr));
msg_set_destport(msg, port_peerport(p_ptr));
msg_set_origport(msg, p_ptr->ref);
msg_set_msgcnt(msg, ack);
}
return buf;
}
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;
u32 data_sz = msg_data_sz(msg);
u32 src_node;
u32 rmsg_sz;
/* discard rejected message if it shouldn't be returned to sender */
if (WARN(!msg_isdata(msg),
"attempt to reject message with user=%u", msg_user(msg))) {
dump_stack();
goto exit;
}
if (msg_errcode(msg) || msg_dest_droppable(msg))
goto exit;
/*
* construct returned message by copying rejected message header and
* data (or subset), then updating header fields that need adjusting
*/
hdr_sz = msg_hdr_sz(msg);
rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
rbuf = tipc_buf_acquire(rmsg_sz);
if (rbuf == NULL)
goto exit;
rmsg = buf_msg(rbuf);
skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
if (msg_connected(rmsg)) {
imp = msg_importance(rmsg);
if (imp < TIPC_CRITICAL_IMPORTANCE)
msg_set_importance(rmsg, ++imp);
}
msg_set_non_seq(rmsg, 0);
msg_set_size(rmsg, rmsg_sz);
msg_set_errcode(rmsg, err);
msg_set_prevnode(rmsg, tipc_own_addr);
msg_swap_words(rmsg, 4, 5);
if (!msg_short(rmsg))
msg_swap_words(rmsg, 6, 7);
/* send self-abort message when rejecting on a connected port */
if (msg_connected(msg)) {
struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
if (p_ptr) {
struct sk_buff *abuf = NULL;
if (p_ptr->connected)
abuf = port_build_self_abort_msg(p_ptr, err);
tipc_port_unlock(p_ptr);
tipc_net_route_msg(abuf);
}
}
/* send returned message & dispose of rejected message */
src_node = msg_prevnode(msg);
if (in_own_node(src_node))
tipc_port_recv_msg(rbuf);
else
tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
exit:
kfree_skb(buf);
return data_sz;
}
int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
struct iovec const *msg_sect, unsigned int len,
int err)
{
struct sk_buff *buf;
int res;
res = tipc_msg_build(hdr, msg_sect, len, MAX_MSG_SIZE, &buf);
if (!buf)
return res;
return tipc_reject_msg(buf, err);
}
static void port_timeout(unsigned long ref)
{
struct tipc_port *p_ptr = tipc_port_lock(ref);
struct sk_buff *buf = NULL;
if (!p_ptr)
return;
if (!p_ptr->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(p_ptr, CONN_PROBE, 0);
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 tipc_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 tipc_port *p_ptr, u32 err)
{
struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
if (buf) {
struct tipc_msg *msg = buf_msg(buf);
msg_swap_words(msg, 4, 5);
msg_swap_words(msg, 6, 7);
}
return buf;
}
static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
{
struct sk_buff *buf;
struct tipc_msg *msg;
u32 imp;
if (!p_ptr->connected)
return NULL;
buf = tipc_buf_acquire(BASIC_H_SIZE);
if (buf) {
msg = buf_msg(buf);
memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
msg_set_hdr_sz(msg, BASIC_H_SIZE);
msg_set_size(msg, BASIC_H_SIZE);
imp = msg_importance(msg);
if (imp < TIPC_CRITICAL_IMPORTANCE)
msg_set_importance(msg, ++imp);
msg_set_errcode(msg, err);
}
return buf;
}
void tipc_port_recv_proto_msg(struct sk_buff *buf)
{
struct tipc_msg *msg = buf_msg(buf);
struct tipc_port *p_ptr;
struct sk_buff *r_buf = NULL;
u32 destport = msg_destport(msg);
int wakeable;
/* Validate connection */
p_ptr = tipc_port_lock(destport);
if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) {
r_buf = tipc_buf_acquire(BASIC_H_SIZE);
if (r_buf) {
msg = buf_msg(r_buf);
tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
BASIC_H_SIZE, msg_orignode(msg));
msg_set_errcode(msg, TIPC_ERR_NO_PORT);
msg_set_origport(msg, destport);
msg_set_destport(msg, msg_origport(msg));
}
if (p_ptr)
tipc_port_unlock(p_ptr);
goto exit;
}
/* Process protocol message sent by peer */
switch (msg_type(msg)) {
case CONN_ACK:
wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
p_ptr->wakeup;
p_ptr->acked += msg_msgcnt(msg);
if (!tipc_port_congested(p_ptr)) {
p_ptr->congested = 0;
if (wakeable)
p_ptr->wakeup(p_ptr);
}
break;
case CONN_PROBE:
r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
break;
default:
/* CONN_PROBE_REPLY or unrecognized - no action required */
break;
}
p_ptr->probing_state = CONFIRMED;
tipc_port_unlock(p_ptr);
exit:
tipc_net_route_msg(r_buf);
kfree_skb(buf);
}
static int port_print(struct tipc_port *p_ptr, char *buf, int len, int full_id)
{
struct publication *publ;
int ret;
if (full_id)
ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
tipc_zone(tipc_own_addr),
tipc_cluster(tipc_own_addr),
tipc_node(tipc_own_addr), p_ptr->ref);
else
ret = tipc_snprintf(buf, len, "%-10u:", p_ptr->ref);
if (p_ptr->connected) {
u32 dport = port_peerport(p_ptr);
u32 destnode = port_peernode(p_ptr);
ret += tipc_snprintf(buf + ret, len - ret,
" connected to <%u.%u.%u:%u>",
tipc_zone(destnode),
tipc_cluster(destnode),
tipc_node(destnode), dport);
if (p_ptr->conn_type != 0)
ret += tipc_snprintf(buf + ret, len - ret,
" via {%u,%u}", p_ptr->conn_type,
p_ptr->conn_instance);
} else if (p_ptr->published) {
ret += tipc_snprintf(buf + ret, len - ret, " bound to");
list_for_each_entry(publ, &p_ptr->publications, pport_list) {
if (publ->lower == publ->upper)
ret += tipc_snprintf(buf + ret, len - ret,
" {%u,%u}", publ->type,
publ->lower);
else
ret += tipc_snprintf(buf + ret, len - ret,
" {%u,%u,%u}", publ->type,
publ->lower, publ->upper);
}
}
ret += tipc_snprintf(buf + ret, len - ret, "\n");
return ret;
}
struct sk_buff *tipc_port_get_ports(void)
{
struct sk_buff *buf;
struct tlv_desc *rep_tlv;
char *pb;
int pb_len;
struct tipc_port *p_ptr;
int str_len = 0;
buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
if (!buf)
return NULL;
rep_tlv = (struct tlv_desc *)buf->data;
pb = TLV_DATA(rep_tlv);
pb_len = ULTRA_STRING_MAX_LEN;
spin_lock_bh(&tipc_port_list_lock);
list_for_each_entry(p_ptr, &ports, port_list) {
spin_lock_bh(p_ptr->lock);
str_len += port_print(p_ptr, pb, pb_len, 0);
spin_unlock_bh(p_ptr->lock);
}
spin_unlock_bh(&tipc_port_list_lock);
str_len += 1; /* for "\0" */
skb_put(buf, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
return buf;
}
void tipc_port_reinit(void)
{
struct tipc_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->phdr;
msg_set_prevnode(msg, tipc_own_addr);
msg_set_orignode(msg, tipc_own_addr);
}
spin_unlock_bh(&tipc_port_list_lock);
}
void tipc_acknowledge(u32 ref, u32 ack)
{
struct tipc_port *p_ptr;
struct sk_buff *buf = NULL;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return;
if (p_ptr->connected) {
p_ptr->conn_unacked -= ack;
buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
}
tipc_port_unlock(p_ptr);
tipc_net_route_msg(buf);
}
int tipc_portimportance(u32 ref, unsigned int *importance)
{
struct tipc_port *p_ptr;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
*importance = (unsigned int)msg_importance(&p_ptr->phdr);
tipc_port_unlock(p_ptr);
return 0;
}
int tipc_set_portimportance(u32 ref, unsigned int imp)
{
struct tipc_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->phdr, (u32)imp);
tipc_port_unlock(p_ptr);
return 0;
}
int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
struct tipc_name_seq const *seq)
{
struct publication *publ;
u32 key;
if (p_ptr->connected)
return -EINVAL;
key = p_ptr->ref + p_ptr->pub_count + 1;
if (key == p_ptr->ref)
return -EADDRINUSE;
publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
scope, p_ptr->ref, key);
if (publ) {
list_add(&publ->pport_list, &p_ptr->publications);
p_ptr->pub_count++;
p_ptr->published = 1;
return 0;
}
return -EINVAL;
}
int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
struct tipc_name_seq const *seq)
{
struct publication *publ;
struct publication *tpubl;
int res = -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 = 0;
} 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 = 0;
break;
}
}
if (list_empty(&p_ptr->publications))
p_ptr->published = 0;
return res;
}
int tipc_connect(u32 ref, struct tipc_portid const *peer)
{
struct tipc_port *p_ptr;
int res;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
res = __tipc_connect(ref, p_ptr, peer);
tipc_port_unlock(p_ptr);
return res;
}
/*
* __tipc_connect - connect to a remote peer
*
* Port must be locked.
*/
int __tipc_connect(u32 ref, struct tipc_port *p_ptr,
struct tipc_portid const *peer)
{
struct tipc_msg *msg;
int res = -EINVAL;
if (p_ptr->published || p_ptr->connected)
goto exit;
if (!peer->ref)
goto exit;
msg = &p_ptr->phdr;
msg_set_destnode(msg, peer->node);
msg_set_destport(msg, peer->ref);
msg_set_type(msg, TIPC_CONN_MSG);
msg_set_lookup_scope(msg, 0);
msg_set_hdr_sz(msg, SHORT_H_SIZE);
p_ptr->probing_interval = PROBING_INTERVAL;
p_ptr->probing_state = CONFIRMED;
p_ptr->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 = 0;
exit:
p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
return res;
}
/*
* __tipc_disconnect - disconnect port from peer
*
* Port must be locked.
*/
int __tipc_disconnect(struct tipc_port *tp_ptr)
{
if (tp_ptr->connected) {
tp_ptr->connected = 0;
/* let timer expire on it's own to avoid deadlock! */
tipc_nodesub_unsubscribe(&tp_ptr->subscription);
return 0;
}
return -ENOTCONN;
}
/*
* tipc_disconnect(): Disconnect port form peer.
* This is a node local operation.
*/
int tipc_disconnect(u32 ref)
{
struct tipc_port *p_ptr;
int res;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
res = __tipc_disconnect(p_ptr);
tipc_port_unlock(p_ptr);
return res;
}
/*
* tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
*/
int tipc_shutdown(u32 ref)
{
struct tipc_port *p_ptr;
struct sk_buff *buf = NULL;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
tipc_port_unlock(p_ptr);
tipc_net_route_msg(buf);
return tipc_disconnect(ref);
}
/**
* tipc_port_recv_msg - receive message from lower layer and deliver to port user
*/
int tipc_port_recv_msg(struct sk_buff *buf)
{
struct tipc_port *p_ptr;
struct tipc_msg *msg = buf_msg(buf);
u32 destport = msg_destport(msg);
u32 dsz = msg_data_sz(msg);
u32 err;
/* forward unresolved named message */
if (unlikely(!destport)) {
tipc_net_route_msg(buf);
return dsz;
}
/* validate destination & pass to port, otherwise reject message */
p_ptr = tipc_port_lock(destport);
if (likely(p_ptr)) {
err = p_ptr->dispatcher(p_ptr, buf);
tipc_port_unlock(p_ptr);
if (likely(!err))
return dsz;
} else {
err = TIPC_ERR_NO_PORT;
}
return tipc_reject_msg(buf, err);
}
/*
* tipc_port_recv_sections(): Concatenate and deliver sectioned
* message for this node.
*/
static int tipc_port_recv_sections(struct tipc_port *sender,
struct iovec const *msg_sect,
unsigned int len)
{
struct sk_buff *buf;
int res;
res = tipc_msg_build(&sender->phdr, msg_sect, len, MAX_MSG_SIZE, &buf);
if (likely(buf))
tipc_port_recv_msg(buf);
return res;
}
/**
* tipc_send - send message sections on connection
*/
int tipc_send(u32 ref, struct iovec const *msg_sect, unsigned int len)
{
struct tipc_port *p_ptr;
u32 destnode;
int res;
p_ptr = tipc_port_deref(ref);
if (!p_ptr || !p_ptr->connected)
return -EINVAL;
p_ptr->congested = 1;
if (!tipc_port_congested(p_ptr)) {
destnode = port_peernode(p_ptr);
if (likely(!in_own_node(destnode)))
res = tipc_link_send_sections_fast(p_ptr, msg_sect,
len, destnode);
else
res = tipc_port_recv_sections(p_ptr, msg_sect, len);
if (likely(res != -ELINKCONG)) {
p_ptr->congested = 0;
if (res > 0)
p_ptr->sent++;
return res;
}
}
if (port_unreliable(p_ptr)) {
p_ptr->congested = 0;
return len;
}
return -ELINKCONG;
}
/**
* tipc_send2name - send message sections to port name
*/
int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
struct iovec const *msg_sect, unsigned int len)
{
struct tipc_port *p_ptr;
struct tipc_msg *msg;
u32 destnode = domain;
u32 destport;
int res;
p_ptr = tipc_port_deref(ref);
if (!p_ptr || p_ptr->connected)
return -EINVAL;
msg = &p_ptr->phdr;
msg_set_type(msg, TIPC_NAMED_MSG);
msg_set_hdr_sz(msg, NAMED_H_SIZE);
msg_set_nametype(msg, name->type);
msg_set_nameinst(msg, name->instance);
msg_set_lookup_scope(msg, tipc_addr_scope(domain));
destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
msg_set_destnode(msg, destnode);
msg_set_destport(msg, destport);
if (likely(destport || destnode)) {
if (likely(in_own_node(destnode)))
res = tipc_port_recv_sections(p_ptr, msg_sect, len);
else if (tipc_own_addr)
res = tipc_link_send_sections_fast(p_ptr, msg_sect,
len, destnode);
else
res = tipc_port_reject_sections(p_ptr, msg, msg_sect,
len, TIPC_ERR_NO_NODE);
if (likely(res != -ELINKCONG)) {
if (res > 0)
p_ptr->sent++;
return res;
}
if (port_unreliable(p_ptr)) {
return len;
}
return -ELINKCONG;
}
return tipc_port_reject_sections(p_ptr, msg, msg_sect, len,
TIPC_ERR_NO_NAME);
}
/**
* tipc_send2port - send message sections to port identity
*/
int tipc_send2port(u32 ref, struct tipc_portid const *dest,
struct iovec const *msg_sect, unsigned int len)
{
struct tipc_port *p_ptr;
struct tipc_msg *msg;
int res;
p_ptr = tipc_port_deref(ref);
if (!p_ptr || p_ptr->connected)
return -EINVAL;
msg = &p_ptr->phdr;
msg_set_type(msg, TIPC_DIRECT_MSG);
msg_set_lookup_scope(msg, 0);
msg_set_destnode(msg, dest->node);
msg_set_destport(msg, dest->ref);
msg_set_hdr_sz(msg, BASIC_H_SIZE);
if (in_own_node(dest->node))
res = tipc_port_recv_sections(p_ptr, msg_sect, len);
else if (tipc_own_addr)
res = tipc_link_send_sections_fast(p_ptr, msg_sect, len,
dest->node);
else
res = tipc_port_reject_sections(p_ptr, msg, msg_sect, len,
TIPC_ERR_NO_NODE);
if (likely(res != -ELINKCONG)) {
if (res > 0)
p_ptr->sent++;
return res;
}
if (port_unreliable(p_ptr)) {
return len;
}
return -ELINKCONG;
}