/* * net/tipc/node.c: TIPC node management routines * * Copyright (c) 2000-2006, 2012 Ericsson AB * Copyright (c) 2005-2006, 2010-2011, 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 "node.h"#include "name_distr.h" #define NODE_HTABLE_SIZE 512 static void node_lost_contact(struct tipc_node *n_ptr);static void node_established_contact(struct tipc_node *n_ptr); static DEFINE_SPINLOCK(node_create_lock); static struct hlist_head node_htable[NODE_HTABLE_SIZE];LIST_HEAD(tipc_node_list);static u32 tipc_num_nodes; static atomic_t tipc_num_links = ATOMIC_INIT(0); /* * A trivial power-of-two bitmask technique is used for speed, since this * operation is done for every incoming TIPC packet. The number of hash table * entries has been chosen so that no hash chain exceeds 8 nodes and will * usually be much smaller (typically only a single node). */static unsigned int tipc_hashfn(u32 addr){ return addr & (NODE_HTABLE_SIZE - 1);} /* * tipc_node_find - locate specified node object, if it exists */struct tipc_node *tipc_node_find(u32 addr){ struct tipc_node *node; if (unlikely(!in_own_cluster_exact(addr))) return NULL; hlist_for_each_entry(node, &node_htable[tipc_hashfn(addr)], hash) { if (node->addr == addr) return node; } return NULL;} /** * tipc_node_create - create neighboring node * * Currently, this routine is called by neighbor discovery code, which holds * net_lock for reading only. We must take node_create_lock to ensure a node * isn't created twice if two different bearers discover the node at the same * time. (It would be preferable to switch to holding net_lock in write mode, * but this is a non-trivial change.) */struct tipc_node *tipc_node_create(u32 addr){ struct tipc_node *n_ptr, *temp_node; spin_lock_bh(&node_create_lock); n_ptr = tipc_node_find(addr); if (n_ptr) { spin_unlock_bh(&node_create_lock); return n_ptr; } n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC); if (!n_ptr) { spin_unlock_bh(&node_create_lock); pr_warn("Node creation failed, no memory\n"); return NULL; } n_ptr->addr = addr; spin_lock_init(&n_ptr->lock); INIT_HLIST_NODE(&n_ptr->hash); INIT_LIST_HEAD(&n_ptr->list); INIT_LIST_HEAD(&n_ptr->nsub); hlist_add_head(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]); list_for_each_entry(temp_node, &tipc_node_list, list) { if (n_ptr->addr < temp_node->addr) break; } list_add_tail(&n_ptr->list, &temp_node->list); n_ptr->block_setup = WAIT_PEER_DOWN; n_ptr->signature = INVALID_NODE_SIG; tipc_num_nodes++; spin_unlock_bh(&node_create_lock); return n_ptr;} void tipc_node_delete(struct tipc_node *n_ptr){ list_del(&n_ptr->list); hlist_del(&n_ptr->hash); kfree(n_ptr); tipc_num_nodes--;} /** * tipc_node_link_up - handle addition of link * * Link becomes active (alone or shared) or standby, depending on its priority. */void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr){ struct tipc_link **active = &n_ptr->active_links[0]; n_ptr->working_links++; pr_info("Established link <%s> on network plane %c\n", l_ptr->name, l_ptr->b_ptr->net_plane); if (!active[0]) { active[0] = active[1] = l_ptr; node_established_contact(n_ptr); return; } if (l_ptr->priority < active[0]->priority) { pr_info("New link <%s> becomes standby\n", l_ptr->name); return; } tipc_link_dup_send_queue(active[0], l_ptr); if (l_ptr->priority == active[0]->priority) { active[0] = l_ptr; return; } pr_info("Old link <%s> becomes standby\n", active[0]->name); if (active[1] != active[0]) pr_info("Old link <%s> becomes standby\n", active[1]->name); active[0] = active[1] = l_ptr;} /** * node_select_active_links - select active link */static void node_select_active_links(struct tipc_node *n_ptr){ struct tipc_link **active = &n_ptr->active_links[0]; u32 i; u32 highest_prio = 0; active[0] = active[1] = NULL; for (i = 0; i < MAX_BEARERS; i++) { struct tipc_link *l_ptr = n_ptr->links[i]; if (!l_ptr || !tipc_link_is_up(l_ptr) || (l_ptr->priority < highest_prio)) continue; if (l_ptr->priority > highest_prio) { highest_prio = l_ptr->priority; active[0] = active[1] = l_ptr; } else { active[1] = l_ptr; } }} /** * tipc_node_link_down - handle loss of link */void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr){ struct tipc_link **active; n_ptr->working_links--; if (!tipc_link_is_active(l_ptr)) { pr_info("Lost standby link <%s> on network plane %c\n", l_ptr->name, l_ptr->b_ptr->net_plane); return; } pr_info("Lost link <%s> on network plane %c\n", l_ptr->name, l_ptr->b_ptr->net_plane); active = &n_ptr->active_links[0]; if (active[0] == l_ptr) active[0] = active[1]; if (active[1] == l_ptr) active[1] = active[0]; if (active[0] == l_ptr) node_select_active_links(n_ptr); if (tipc_node_is_up(n_ptr)) tipc_link_failover_send_queue(l_ptr); else node_lost_contact(n_ptr);} int tipc_node_active_links(struct tipc_node *n_ptr){ return n_ptr->active_links[0] != NULL;} int tipc_node_is_up(struct tipc_node *n_ptr){ return tipc_node_active_links(n_ptr);} void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr){ n_ptr->links[l_ptr->b_ptr->identity] = l_ptr; atomic_inc(&tipc_num_links); n_ptr->link_cnt++;} void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr){ n_ptr->links[l_ptr->b_ptr->identity] = NULL; atomic_dec(&tipc_num_links); n_ptr->link_cnt--;} static void node_established_contact(struct tipc_node *n_ptr){ tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr); n_ptr->bclink.oos_state = 0; n_ptr->bclink.acked = tipc_bclink_get_last_sent(); tipc_bclink_add_node(n_ptr->addr);} static void node_name_purge_complete(unsigned long node_addr){ struct tipc_node *n_ptr; read_lock_bh(&tipc_net_lock); n_ptr = tipc_node_find(node_addr); if (n_ptr) { tipc_node_lock(n_ptr); n_ptr->block_setup &= ~WAIT_NAMES_GONE; tipc_node_unlock(n_ptr); } read_unlock_bh(&tipc_net_lock);} static void node_lost_contact(struct tipc_node *n_ptr){ char addr_string[16]; u32 i; pr_info("Lost contact with %s\n", tipc_addr_string_fill(addr_string, n_ptr->addr)); /* Flush broadcast link info associated with lost node */ if (n_ptr->bclink.recv_permitted) { kfree_skb_list(n_ptr->bclink.deferred_head); n_ptr->bclink.deferred_size = 0; if (n_ptr->bclink.reasm_head) { kfree_skb(n_ptr->bclink.reasm_head); n_ptr->bclink.reasm_head = NULL; n_ptr->bclink.reasm_tail = NULL; } tipc_bclink_remove_node(n_ptr->addr); tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ); n_ptr->bclink.recv_permitted = false; } /* Abort link changeover */ for (i = 0; i < MAX_BEARERS; i++) { struct tipc_link *l_ptr = n_ptr->links[i]; if (!l_ptr) continue; l_ptr->reset_checkpoint = l_ptr->next_in_no; l_ptr->exp_msg_count = 0; tipc_link_reset_fragments(l_ptr); } /* Notify subscribers */ tipc_nodesub_notify(n_ptr); /* Prevent re-contact with node until cleanup is done */ n_ptr->block_setup = WAIT_PEER_DOWN | WAIT_NAMES_GONE; tipc_k_signal((Handler)node_name_purge_complete, n_ptr->addr);} struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space){ u32 domain; struct sk_buff *buf; struct tipc_node *n_ptr; struct tipc_node_info node_info; u32 payload_size; if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR)) return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area)); if (!tipc_addr_domain_valid(domain)) return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE " (network address)"); read_lock_bh(&tipc_net_lock); if (!tipc_num_nodes) { read_unlock_bh(&tipc_net_lock); return tipc_cfg_reply_none(); } /* For now, get space for all other nodes */ payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes; if (payload_size > 32768u) { read_unlock_bh(&tipc_net_lock); return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED " (too many nodes)"); } buf = tipc_cfg_reply_alloc(payload_size); if (!buf) { read_unlock_bh(&tipc_net_lock); return NULL; } /* Add TLVs for all nodes in scope */ list_for_each_entry(n_ptr, &tipc_node_list, list) { if (!tipc_in_scope(domain, n_ptr->addr)) continue; node_info.addr = htonl(n_ptr->addr); node_info.up = htonl(tipc_node_is_up(n_ptr)); tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO, &node_info, sizeof(node_info)); } read_unlock_bh(&tipc_net_lock); return buf;} struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space){ u32 domain; struct sk_buff *buf; struct tipc_node *n_ptr; struct tipc_link_info link_info; u32 payload_size; if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR)) return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area)); if (!tipc_addr_domain_valid(domain)) return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE " (network address)"); if (!tipc_own_addr) return tipc_cfg_reply_none(); read_lock_bh(&tipc_net_lock); /* Get space for all unicast links + broadcast link */ payload_size = TLV_SPACE(sizeof(link_info)) * (atomic_read(&tipc_num_links) + 1); if (payload_size > 32768u) { read_unlock_bh(&tipc_net_lock); return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED " (too many links)"); } buf = tipc_cfg_reply_alloc(payload_size); if (!buf) { read_unlock_bh(&tipc_net_lock); return NULL; } /* Add TLV for broadcast link */ link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr)); link_info.up = htonl(1); strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME); tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info)); /* Add TLVs for any other links in scope */ list_for_each_entry(n_ptr, &tipc_node_list, list) { u32 i; if (!tipc_in_scope(domain, n_ptr->addr)) continue; tipc_node_lock(n_ptr); for (i = 0; i < MAX_BEARERS; i++) { if (!n_ptr->links[i]) continue; link_info.dest = htonl(n_ptr->addr); link_info.up = htonl(tipc_link_is_up(n_ptr->links[i])); strcpy(link_info.str, n_ptr->links[i]->name); tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info)); } tipc_node_unlock(n_ptr); } read_unlock_bh(&tipc_net_lock); return buf;}
/*
* net/tipc/node.c: TIPC node management routines
*
* Copyright (c) 2000-2006, 2012 Ericsson AB
* Copyright (c) 2005-2006, 2010-2011, 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 "node.h"
#include "name_distr.h"
#define NODE_HTABLE_SIZE 512
static void node_lost_contact(struct tipc_node *n_ptr);
static void node_established_contact(struct tipc_node *n_ptr);
static DEFINE_SPINLOCK(node_create_lock);
static struct hlist_head node_htable[NODE_HTABLE_SIZE];
LIST_HEAD(tipc_node_list);
static u32 tipc_num_nodes;
static atomic_t tipc_num_links = ATOMIC_INIT(0);
/*
* A trivial power-of-two bitmask technique is used for speed, since this
* operation is done for every incoming TIPC packet. The number of hash table
* entries has been chosen so that no hash chain exceeds 8 nodes and will
* usually be much smaller (typically only a single node).
*/
static unsigned int tipc_hashfn(u32 addr)
{
return addr & (NODE_HTABLE_SIZE - 1);
}
/*
* tipc_node_find - locate specified node object, if it exists
*/
struct tipc_node *tipc_node_find(u32 addr)
{
struct tipc_node *node;
if (unlikely(!in_own_cluster_exact(addr)))
return NULL;
hlist_for_each_entry(node, &node_htable[tipc_hashfn(addr)], hash) {
if (node->addr == addr)
return node;
}
return NULL;
}
/**
* tipc_node_create - create neighboring node
*
* Currently, this routine is called by neighbor discovery code, which holds
* net_lock for reading only. We must take node_create_lock to ensure a node
* isn't created twice if two different bearers discover the node at the same
* time. (It would be preferable to switch to holding net_lock in write mode,
* but this is a non-trivial change.)
*/
struct tipc_node *tipc_node_create(u32 addr)
{
struct tipc_node *n_ptr, *temp_node;
spin_lock_bh(&node_create_lock);
n_ptr = tipc_node_find(addr);
if (n_ptr) {
spin_unlock_bh(&node_create_lock);
return n_ptr;
}
n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
if (!n_ptr) {
spin_unlock_bh(&node_create_lock);
pr_warn("Node creation failed, no memory\n");
return NULL;
}
n_ptr->addr = addr;
spin_lock_init(&n_ptr->lock);
INIT_HLIST_NODE(&n_ptr->hash);
INIT_LIST_HEAD(&n_ptr->list);
INIT_LIST_HEAD(&n_ptr->nsub);
hlist_add_head(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
list_for_each_entry(temp_node, &tipc_node_list, list) {
if (n_ptr->addr < temp_node->addr)
break;
}
list_add_tail(&n_ptr->list, &temp_node->list);
n_ptr->block_setup = WAIT_PEER_DOWN;
n_ptr->signature = INVALID_NODE_SIG;
tipc_num_nodes++;
spin_unlock_bh(&node_create_lock);
return n_ptr;
}
void tipc_node_delete(struct tipc_node *n_ptr)
{
list_del(&n_ptr->list);
hlist_del(&n_ptr->hash);
kfree(n_ptr);
tipc_num_nodes--;
}
/**
* tipc_node_link_up - handle addition of link
*
* Link becomes active (alone or shared) or standby, depending on its priority.
*/
void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
{
struct tipc_link **active = &n_ptr->active_links[0];
n_ptr->working_links++;
pr_info("Established link <%s> on network plane %c\n",
l_ptr->name, l_ptr->b_ptr->net_plane);
if (!active[0]) {
active[0] = active[1] = l_ptr;
node_established_contact(n_ptr);
return;
}
if (l_ptr->priority < active[0]->priority) {
pr_info("New link <%s> becomes standby\n", l_ptr->name);
return;
}
tipc_link_dup_send_queue(active[0], l_ptr);
if (l_ptr->priority == active[0]->priority) {
active[0] = l_ptr;
return;
}
pr_info("Old link <%s> becomes standby\n", active[0]->name);
if (active[1] != active[0])
pr_info("Old link <%s> becomes standby\n", active[1]->name);
active[0] = active[1] = l_ptr;
}
/**
* node_select_active_links - select active link
*/
static void node_select_active_links(struct tipc_node *n_ptr)
{
struct tipc_link **active = &n_ptr->active_links[0];
u32 i;
u32 highest_prio = 0;
active[0] = active[1] = NULL;
for (i = 0; i < MAX_BEARERS; i++) {
struct tipc_link *l_ptr = n_ptr->links[i];
if (!l_ptr || !tipc_link_is_up(l_ptr) ||
(l_ptr->priority < highest_prio))
continue;
if (l_ptr->priority > highest_prio) {
highest_prio = l_ptr->priority;
active[0] = active[1] = l_ptr;
} else {
active[1] = l_ptr;
}
}
}
/**
* tipc_node_link_down - handle loss of link
*/
void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
{
struct tipc_link **active;
n_ptr->working_links--;
if (!tipc_link_is_active(l_ptr)) {
pr_info("Lost standby link <%s> on network plane %c\n",
l_ptr->name, l_ptr->b_ptr->net_plane);
return;
}
pr_info("Lost link <%s> on network plane %c\n",
l_ptr->name, l_ptr->b_ptr->net_plane);
active = &n_ptr->active_links[0];
if (active[0] == l_ptr)
active[0] = active[1];
if (active[1] == l_ptr)
active[1] = active[0];
if (active[0] == l_ptr)
node_select_active_links(n_ptr);
if (tipc_node_is_up(n_ptr))
tipc_link_failover_send_queue(l_ptr);
else
node_lost_contact(n_ptr);
}
int tipc_node_active_links(struct tipc_node *n_ptr)
{
return n_ptr->active_links[0] != NULL;
}
int tipc_node_is_up(struct tipc_node *n_ptr)
{
return tipc_node_active_links(n_ptr);
}
void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
{
n_ptr->links[l_ptr->b_ptr->identity] = l_ptr;
atomic_inc(&tipc_num_links);
n_ptr->link_cnt++;
}
void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
{
n_ptr->links[l_ptr->b_ptr->identity] = NULL;
atomic_dec(&tipc_num_links);
n_ptr->link_cnt--;
}
static void node_established_contact(struct tipc_node *n_ptr)
{
tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
n_ptr->bclink.oos_state = 0;
n_ptr->bclink.acked = tipc_bclink_get_last_sent();
tipc_bclink_add_node(n_ptr->addr);
}
static void node_name_purge_complete(unsigned long node_addr)
{
struct tipc_node *n_ptr;
read_lock_bh(&tipc_net_lock);
n_ptr = tipc_node_find(node_addr);
if (n_ptr) {
tipc_node_lock(n_ptr);
n_ptr->block_setup &= ~WAIT_NAMES_GONE;
tipc_node_unlock(n_ptr);
}
read_unlock_bh(&tipc_net_lock);
}
static void node_lost_contact(struct tipc_node *n_ptr)
{
char addr_string[16];
u32 i;
pr_info("Lost contact with %s\n",
tipc_addr_string_fill(addr_string, n_ptr->addr));
/* Flush broadcast link info associated with lost node */
if (n_ptr->bclink.recv_permitted) {
kfree_skb_list(n_ptr->bclink.deferred_head);
n_ptr->bclink.deferred_size = 0;
if (n_ptr->bclink.reasm_head) {
kfree_skb(n_ptr->bclink.reasm_head);
n_ptr->bclink.reasm_head = NULL;
n_ptr->bclink.reasm_tail = NULL;
}
tipc_bclink_remove_node(n_ptr->addr);
tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
n_ptr->bclink.recv_permitted = false;
}
/* Abort link changeover */
for (i = 0; i < MAX_BEARERS; i++) {
struct tipc_link *l_ptr = n_ptr->links[i];
if (!l_ptr)
continue;
l_ptr->reset_checkpoint = l_ptr->next_in_no;
l_ptr->exp_msg_count = 0;
tipc_link_reset_fragments(l_ptr);
}
/* Notify subscribers */
tipc_nodesub_notify(n_ptr);
/* Prevent re-contact with node until cleanup is done */
n_ptr->block_setup = WAIT_PEER_DOWN | WAIT_NAMES_GONE;
tipc_k_signal((Handler)node_name_purge_complete, n_ptr->addr);
}
struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
{
u32 domain;
struct sk_buff *buf;
struct tipc_node *n_ptr;
struct tipc_node_info node_info;
u32 payload_size;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (!tipc_addr_domain_valid(domain))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (network address)");
read_lock_bh(&tipc_net_lock);
if (!tipc_num_nodes) {
read_unlock_bh(&tipc_net_lock);
return tipc_cfg_reply_none();
}
/* For now, get space for all other nodes */
payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes;
if (payload_size > 32768u) {
read_unlock_bh(&tipc_net_lock);
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (too many nodes)");
}
buf = tipc_cfg_reply_alloc(payload_size);
if (!buf) {
read_unlock_bh(&tipc_net_lock);
return NULL;
}
/* Add TLVs for all nodes in scope */
list_for_each_entry(n_ptr, &tipc_node_list, list) {
if (!tipc_in_scope(domain, n_ptr->addr))
continue;
node_info.addr = htonl(n_ptr->addr);
node_info.up = htonl(tipc_node_is_up(n_ptr));
tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
&node_info, sizeof(node_info));
}
read_unlock_bh(&tipc_net_lock);
return buf;
}
struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
{
u32 domain;
struct sk_buff *buf;
struct tipc_node *n_ptr;
struct tipc_link_info link_info;
u32 payload_size;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (!tipc_addr_domain_valid(domain))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (network address)");
if (!tipc_own_addr)
return tipc_cfg_reply_none();
read_lock_bh(&tipc_net_lock);
/* Get space for all unicast links + broadcast link */
payload_size = TLV_SPACE(sizeof(link_info)) *
(atomic_read(&tipc_num_links) + 1);
if (payload_size > 32768u) {
read_unlock_bh(&tipc_net_lock);
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (too many links)");
}
buf = tipc_cfg_reply_alloc(payload_size);
if (!buf) {
read_unlock_bh(&tipc_net_lock);
return NULL;
}
/* Add TLV for broadcast link */
link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr));
link_info.up = htonl(1);
strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME);
tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
/* Add TLVs for any other links in scope */
list_for_each_entry(n_ptr, &tipc_node_list, list) {
u32 i;
if (!tipc_in_scope(domain, n_ptr->addr))
continue;
tipc_node_lock(n_ptr);
for (i = 0; i < MAX_BEARERS; i++) {
if (!n_ptr->links[i])
continue;
link_info.dest = htonl(n_ptr->addr);
link_info.up = htonl(tipc_link_is_up(n_ptr->links[i]));
strcpy(link_info.str, n_ptr->links[i]->name);
tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
&link_info, sizeof(link_info));
}
tipc_node_unlock(n_ptr);
}
read_unlock_bh(&tipc_net_lock);
return buf;
}