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android-kvm / linux / 53e87e3cdc155f20c3417b689df8d2ac88d79576 / . / net / tipc / node.c
blob: 9947b7dfe1d2d075e010d381e2fb249b9bdf90c1 [file] [log] [blame]
/*
* net/tipc/node.c: TIPC node management routines
*
* Copyright (c) 2000-2006, 2012-2016, Ericsson AB
* Copyright (c) 2005-2006, 2010-2014, 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 "link.h"
#include "node.h"
#include "name_distr.h"
#include "socket.h"
#include "bcast.h"
#include "monitor.h"
#include "discover.h"
#include "netlink.h"
#include "trace.h"
#include "crypto.h"
#define INVALID_NODE_SIG 0x10000
#define NODE_CLEANUP_AFTER 300000
/* Flags used to take different actions according to flag type
* TIPC_NOTIFY_NODE_DOWN: notify node is down
* TIPC_NOTIFY_NODE_UP: notify node is up
* TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
*/
enum {
TIPC_NOTIFY_NODE_DOWN = (1 << 3),
TIPC_NOTIFY_NODE_UP = (1 << 4),
TIPC_NOTIFY_LINK_UP = (1 << 6),
TIPC_NOTIFY_LINK_DOWN = (1 << 7)
};
struct tipc_link_entry {
struct tipc_link *link;
spinlock_t lock; /* per link */
u32 mtu;
struct sk_buff_head inputq;
struct tipc_media_addr maddr;
};
struct tipc_bclink_entry {
struct tipc_link *link;
struct sk_buff_head inputq1;
struct sk_buff_head arrvq;
struct sk_buff_head inputq2;
struct sk_buff_head namedq;
u16 named_rcv_nxt;
bool named_open;
};
/**
* struct tipc_node - TIPC node structure
* @addr: network address of node
* @kref: reference counter to node object
* @lock: rwlock governing access to structure
* @net: the applicable net namespace
* @hash: links to adjacent nodes in unsorted hash chain
* @inputq: pointer to input queue containing messages for msg event
* @namedq: pointer to name table input queue with name table messages
* @active_links: bearer ids of active links, used as index into links[] array
* @links: array containing references to all links to node
* @bc_entry: broadcast link entry
* @action_flags: bit mask of different types of node actions
* @state: connectivity state vs peer node
* @preliminary: a preliminary node or not
* @failover_sent: failover sent or not
* @sync_point: sequence number where synch/failover is finished
* @list: links to adjacent nodes in sorted list of cluster's nodes
* @working_links: number of working links to node (both active and standby)
* @link_cnt: number of links to node
* @capabilities: bitmap, indicating peer node's functional capabilities
* @signature: node instance identifier
* @link_id: local and remote bearer ids of changing link, if any
* @peer_id: 128-bit ID of peer
* @peer_id_string: ID string of peer
* @publ_list: list of publications
* @conn_sks: list of connections (FIXME)
* @timer: node's keepalive timer
* @keepalive_intv: keepalive interval in milliseconds
* @rcu: rcu struct for tipc_node
* @delete_at: indicates the time for deleting a down node
* @peer_net: peer's net namespace
* @peer_hash_mix: hash for this peer (FIXME)
* @crypto_rx: RX crypto handler
*/
struct tipc_node {
u32 addr;
struct kref kref;
rwlock_t lock;
struct net *net;
struct hlist_node hash;
int active_links[2];
struct tipc_link_entry links[MAX_BEARERS];
struct tipc_bclink_entry bc_entry;
int action_flags;
struct list_head list;
int state;
bool preliminary;
bool failover_sent;
u16 sync_point;
int link_cnt;
u16 working_links;
u16 capabilities;
u32 signature;
u32 link_id;
u8 peer_id[16];
char peer_id_string[NODE_ID_STR_LEN];
struct list_head publ_list;
struct list_head conn_sks;
unsigned long keepalive_intv;
struct timer_list timer;
struct rcu_head rcu;
unsigned long delete_at;
struct net *peer_net;
u32 peer_hash_mix;
#ifdef CONFIG_TIPC_CRYPTO
struct tipc_crypto *crypto_rx;
#endif
};
/* Node FSM states and events:
*/
enum {
SELF_DOWN_PEER_DOWN = 0xdd,
SELF_UP_PEER_UP = 0xaa,
SELF_DOWN_PEER_LEAVING = 0xd1,
SELF_UP_PEER_COMING = 0xac,
SELF_COMING_PEER_UP = 0xca,
SELF_LEAVING_PEER_DOWN = 0x1d,
NODE_FAILINGOVER = 0xf0,
NODE_SYNCHING = 0xcc
};
enum {
SELF_ESTABL_CONTACT_EVT = 0xece,
SELF_LOST_CONTACT_EVT = 0x1ce,
PEER_ESTABL_CONTACT_EVT = 0x9ece,
PEER_LOST_CONTACT_EVT = 0x91ce,
NODE_FAILOVER_BEGIN_EVT = 0xfbe,
NODE_FAILOVER_END_EVT = 0xfee,
NODE_SYNCH_BEGIN_EVT = 0xcbe,
NODE_SYNCH_END_EVT = 0xcee
};
static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
struct sk_buff_head *xmitq,
struct tipc_media_addr **maddr);
static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
bool delete);
static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
static void tipc_node_delete(struct tipc_node *node);
static void tipc_node_timeout(struct timer_list *t);
static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
static bool node_is_up(struct tipc_node *n);
static void tipc_node_delete_from_list(struct tipc_node *node);
struct tipc_sock_conn {
u32 port;
u32 peer_port;
u32 peer_node;
struct list_head list;
};
static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
{
int bearer_id = n->active_links[sel & 1];
if (unlikely(bearer_id == INVALID_BEARER_ID))
return NULL;
return n->links[bearer_id].link;
}
int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected)
{
struct tipc_node *n;
int bearer_id;
unsigned int mtu = MAX_MSG_SIZE;
n = tipc_node_find(net, addr);
if (unlikely(!n))
return mtu;
/* Allow MAX_MSG_SIZE when building connection oriented message
* if they are in the same core network
*/
if (n->peer_net && connected) {
tipc_node_put(n);
return mtu;
}
bearer_id = n->active_links[sel & 1];
if (likely(bearer_id != INVALID_BEARER_ID))
mtu = n->links[bearer_id].mtu;
tipc_node_put(n);
return mtu;
}
bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
{
u8 *own_id = tipc_own_id(net);
struct tipc_node *n;
if (!own_id)
return true;
if (addr == tipc_own_addr(net)) {
memcpy(id, own_id, TIPC_NODEID_LEN);
return true;
}
n = tipc_node_find(net, addr);
if (!n)
return false;
memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
tipc_node_put(n);
return true;
}
u16 tipc_node_get_capabilities(struct net *net, u32 addr)
{
struct tipc_node *n;
u16 caps;
n = tipc_node_find(net, addr);
if (unlikely(!n))
return TIPC_NODE_CAPABILITIES;
caps = n->capabilities;
tipc_node_put(n);
return caps;
}
u32 tipc_node_get_addr(struct tipc_node *node)
{
return (node) ? node->addr : 0;
}
char *tipc_node_get_id_str(struct tipc_node *node)
{
return node->peer_id_string;
}
#ifdef CONFIG_TIPC_CRYPTO
/**
* tipc_node_crypto_rx - Retrieve crypto RX handle from node
* @__n: target tipc_node
* Note: node ref counter must be held first!
*/
struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
{
return (__n) ? __n->crypto_rx : NULL;
}
struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos)
{
return container_of(pos, struct tipc_node, list)->crypto_rx;
}
struct tipc_crypto *tipc_node_crypto_rx_by_addr(struct net *net, u32 addr)
{
struct tipc_node *n;
n = tipc_node_find(net, addr);
return (n) ? n->crypto_rx : NULL;
}
#endif
static void tipc_node_free(struct rcu_head *rp)
{
struct tipc_node *n = container_of(rp, struct tipc_node, rcu);
#ifdef CONFIG_TIPC_CRYPTO
tipc_crypto_stop(&n->crypto_rx);
#endif
kfree(n);
}
static void tipc_node_kref_release(struct kref *kref)
{
struct tipc_node *n = container_of(kref, struct tipc_node, kref);
kfree(n->bc_entry.link);
call_rcu(&n->rcu, tipc_node_free);
}
void tipc_node_put(struct tipc_node *node)
{
kref_put(&node->kref, tipc_node_kref_release);
}
void tipc_node_get(struct tipc_node *node)
{
kref_get(&node->kref);
}
/*
* tipc_node_find - locate specified node object, if it exists
*/
static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_node *node;
unsigned int thash = tipc_hashfn(addr);
rcu_read_lock();
hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
if (node->addr != addr || node->preliminary)
continue;
if (!kref_get_unless_zero(&node->kref))
node = NULL;
break;
}
rcu_read_unlock();
return node;
}
/* tipc_node_find_by_id - locate specified node object by its 128-bit id
* Note: this function is called only when a discovery request failed
* to find the node by its 32-bit id, and is not time critical
*/
static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_node *n;
bool found = false;
rcu_read_lock();
list_for_each_entry_rcu(n, &tn->node_list, list) {
read_lock_bh(&n->lock);
if (!memcmp(id, n->peer_id, 16) &&
kref_get_unless_zero(&n->kref))
found = true;
read_unlock_bh(&n->lock);
if (found)
break;
}
rcu_read_unlock();
return found ? n : NULL;
}
static void tipc_node_read_lock(struct tipc_node *n)
__acquires(n->lock)
{
read_lock_bh(&n->lock);
}
static void tipc_node_read_unlock(struct tipc_node *n)
__releases(n->lock)
{
read_unlock_bh(&n->lock);
}
static void tipc_node_write_lock(struct tipc_node *n)
__acquires(n->lock)
{
write_lock_bh(&n->lock);
}
static void tipc_node_write_unlock_fast(struct tipc_node *n)
__releases(n->lock)
{
write_unlock_bh(&n->lock);
}
static void tipc_node_write_unlock(struct tipc_node *n)
__releases(n->lock)
{
struct tipc_socket_addr sk;
struct net *net = n->net;
u32 flags = n->action_flags;
struct list_head *publ_list;
struct tipc_uaddr ua;
u32 bearer_id;
if (likely(!flags)) {
write_unlock_bh(&n->lock);
return;
}
tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_NODE_SCOPE,
TIPC_LINK_STATE, n->addr, n->addr);
sk.ref = n->link_id;
sk.node = n->addr;
bearer_id = n->link_id & 0xffff;
publ_list = &n->publ_list;
n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
write_unlock_bh(&n->lock);
if (flags & TIPC_NOTIFY_NODE_DOWN)
tipc_publ_notify(net, publ_list, sk.node, n->capabilities);
if (flags & TIPC_NOTIFY_NODE_UP)
tipc_named_node_up(net, sk.node, n->capabilities);
if (flags & TIPC_NOTIFY_LINK_UP) {
tipc_mon_peer_up(net, sk.node, bearer_id);
tipc_nametbl_publish(net, &ua, &sk, sk.ref);
}
if (flags & TIPC_NOTIFY_LINK_DOWN) {
tipc_mon_peer_down(net, sk.node, bearer_id);
tipc_nametbl_withdraw(net, &ua, &sk, sk.ref);
}
}
static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
{
int net_id = tipc_netid(n->net);
struct tipc_net *tn_peer;
struct net *tmp;
u32 hash_chk;
if (n->peer_net)
return;
for_each_net_rcu(tmp) {
tn_peer = tipc_net(tmp);
if (!tn_peer)
continue;
/* Integrity checking whether node exists in namespace or not */
if (tn_peer->net_id != net_id)
continue;
if (memcmp(n->peer_id, tn_peer->node_id, NODE_ID_LEN))
continue;
hash_chk = tipc_net_hash_mixes(tmp, tn_peer->random);
if (hash_mixes ^ hash_chk)
continue;
n->peer_net = tmp;
n->peer_hash_mix = hash_mixes;
break;
}
}
struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
u16 capabilities, u32 hash_mixes,
bool preliminary)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_node *n, *temp_node;
struct tipc_link *l;
unsigned long intv;
int bearer_id;
int i;
spin_lock_bh(&tn->node_list_lock);
n = tipc_node_find(net, addr) ?:
tipc_node_find_by_id(net, peer_id);
if (n) {
if (!n->preliminary)
goto update;
if (preliminary)
goto exit;
/* A preliminary node becomes "real" now, refresh its data */
tipc_node_write_lock(n);
n->preliminary = false;
n->addr = addr;
hlist_del_rcu(&n->hash);
hlist_add_head_rcu(&n->hash,
&tn->node_htable[tipc_hashfn(addr)]);
list_del_rcu(&n->list);
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
if (n->addr < temp_node->addr)
break;
}
list_add_tail_rcu(&n->list, &temp_node->list);
tipc_node_write_unlock_fast(n);
update:
if (n->peer_hash_mix ^ hash_mixes)
tipc_node_assign_peer_net(n, hash_mixes);
if (n->capabilities == capabilities)
goto exit;
/* Same node may come back with new capabilities */
tipc_node_write_lock(n);
n->capabilities = capabilities;
for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
l = n->links[bearer_id].link;
if (l)
tipc_link_update_caps(l, capabilities);
}
tipc_node_write_unlock_fast(n);
/* Calculate cluster capabilities */
tn->capabilities = TIPC_NODE_CAPABILITIES;
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
tn->capabilities &= temp_node->capabilities;
}
tipc_bcast_toggle_rcast(net,
(tn->capabilities & TIPC_BCAST_RCAST));
goto exit;
}
n = kzalloc(sizeof(*n), GFP_ATOMIC);
if (!n) {
pr_warn("Node creation failed, no memory\n");
goto exit;
}
tipc_nodeid2string(n->peer_id_string, peer_id);
#ifdef CONFIG_TIPC_CRYPTO
if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
kfree(n);
n = NULL;
goto exit;
}
#endif
n->addr = addr;
n->preliminary = preliminary;
memcpy(&n->peer_id, peer_id, 16);
n->net = net;
n->peer_net = NULL;
n->peer_hash_mix = 0;
/* Assign kernel local namespace if exists */
tipc_node_assign_peer_net(n, hash_mixes);
n->capabilities = capabilities;
kref_init(&n->kref);
rwlock_init(&n->lock);
INIT_HLIST_NODE(&n->hash);
INIT_LIST_HEAD(&n->list);
INIT_LIST_HEAD(&n->publ_list);
INIT_LIST_HEAD(&n->conn_sks);
skb_queue_head_init(&n->bc_entry.namedq);
skb_queue_head_init(&n->bc_entry.inputq1);
__skb_queue_head_init(&n->bc_entry.arrvq);
skb_queue_head_init(&n->bc_entry.inputq2);
for (i = 0; i < MAX_BEARERS; i++)
spin_lock_init(&n->links[i].lock);
n->state = SELF_DOWN_PEER_LEAVING;
n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
n->signature = INVALID_NODE_SIG;
n->active_links[0] = INVALID_BEARER_ID;
n->active_links[1] = INVALID_BEARER_ID;
n->bc_entry.link = NULL;
tipc_node_get(n);
timer_setup(&n->timer, tipc_node_timeout, 0);
/* Start a slow timer anyway, crypto needs it */
n->keepalive_intv = 10000;
intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
if (!mod_timer(&n->timer, intv))
tipc_node_get(n);
hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
if (n->addr < temp_node->addr)
break;
}
list_add_tail_rcu(&n->list, &temp_node->list);
/* Calculate cluster capabilities */
tn->capabilities = TIPC_NODE_CAPABILITIES;
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
tn->capabilities &= temp_node->capabilities;
}
tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
trace_tipc_node_create(n, true, " ");
exit:
spin_unlock_bh(&tn->node_list_lock);
return n;
}
static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
{
unsigned long tol = tipc_link_tolerance(l);
unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
/* Link with lowest tolerance determines timer interval */
if (intv < n->keepalive_intv)
n->keepalive_intv = intv;
/* Ensure link's abort limit corresponds to current tolerance */
tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
}
static void tipc_node_delete_from_list(struct tipc_node *node)
{
#ifdef CONFIG_TIPC_CRYPTO
tipc_crypto_key_flush(node->crypto_rx);
#endif
list_del_rcu(&node->list);
hlist_del_rcu(&node->hash);
tipc_node_put(node);
}
static void tipc_node_delete(struct tipc_node *node)
{
trace_tipc_node_delete(node, true, " ");
tipc_node_delete_from_list(node);
del_timer_sync(&node->timer);
tipc_node_put(node);
}
void tipc_node_stop(struct net *net)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_node *node, *t_node;
spin_lock_bh(&tn->node_list_lock);
list_for_each_entry_safe(node, t_node, &tn->node_list, list)
tipc_node_delete(node);
spin_unlock_bh(&tn->node_list_lock);
}
void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
{
struct tipc_node *n;
if (in_own_node(net, addr))
return;
n = tipc_node_find(net, addr);
if (!n) {
pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
return;
}
tipc_node_write_lock(n);
list_add_tail(subscr, &n->publ_list);
tipc_node_write_unlock_fast(n);
tipc_node_put(n);
}
void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
{
struct tipc_node *n;
if (in_own_node(net, addr))
return;
n = tipc_node_find(net, addr);
if (!n) {
pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
return;
}
tipc_node_write_lock(n);
list_del_init(subscr);
tipc_node_write_unlock_fast(n);
tipc_node_put(n);
}
int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
{
struct tipc_node *node;
struct tipc_sock_conn *conn;
int err = 0;
if (in_own_node(net, dnode))
return 0;
node = tipc_node_find(net, dnode);
if (!node) {
pr_warn("Connecting sock to node 0x%x failed\n", dnode);
return -EHOSTUNREACH;
}
conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
if (!conn) {
err = -EHOSTUNREACH;
goto exit;
}
conn->peer_node = dnode;
conn->port = port;
conn->peer_port = peer_port;
tipc_node_write_lock(node);
list_add_tail(&conn->list, &node->conn_sks);
tipc_node_write_unlock(node);
exit:
tipc_node_put(node);
return err;
}
void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
{
struct tipc_node *node;
struct tipc_sock_conn *conn, *safe;
if (in_own_node(net, dnode))
return;
node = tipc_node_find(net, dnode);
if (!node)
return;
tipc_node_write_lock(node);
list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
if (port != conn->port)
continue;
list_del(&conn->list);
kfree(conn);
}
tipc_node_write_unlock(node);
tipc_node_put(node);
}
static void tipc_node_clear_links(struct tipc_node *node)
{
int i;
for (i = 0; i < MAX_BEARERS; i++) {
struct tipc_link_entry *le = &node->links[i];
if (le->link) {
kfree(le->link);
le->link = NULL;
node->link_cnt--;
}
}
}
/* tipc_node_cleanup - delete nodes that does not
* have active links for NODE_CLEANUP_AFTER time
*/
static bool tipc_node_cleanup(struct tipc_node *peer)
{
struct tipc_node *temp_node;
struct tipc_net *tn = tipc_net(peer->net);
bool deleted = false;
/* If lock held by tipc_node_stop() the node will be deleted anyway */
if (!spin_trylock_bh(&tn->node_list_lock))
return false;
tipc_node_write_lock(peer);
if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
tipc_node_clear_links(peer);
tipc_node_delete_from_list(peer);
deleted = true;
}
tipc_node_write_unlock(peer);
if (!deleted) {
spin_unlock_bh(&tn->node_list_lock);
return deleted;
}
/* Calculate cluster capabilities */
tn->capabilities = TIPC_NODE_CAPABILITIES;
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
tn->capabilities &= temp_node->capabilities;
}
tipc_bcast_toggle_rcast(peer->net,
(tn->capabilities & TIPC_BCAST_RCAST));
spin_unlock_bh(&tn->node_list_lock);
return deleted;
}
/* tipc_node_timeout - handle expiration of node timer
*/
static void tipc_node_timeout(struct timer_list *t)
{
struct tipc_node *n = from_timer(n, t, timer);
struct tipc_link_entry *le;
struct sk_buff_head xmitq;
int remains = n->link_cnt;
int bearer_id;
int rc = 0;
trace_tipc_node_timeout(n, false, " ");
if (!node_is_up(n) && tipc_node_cleanup(n)) {
/*Removing the reference of Timer*/
tipc_node_put(n);
return;
}
#ifdef CONFIG_TIPC_CRYPTO
/* Take any crypto key related actions first */
tipc_crypto_timeout(n->crypto_rx);
#endif
__skb_queue_head_init(&xmitq);
/* Initial node interval to value larger (10 seconds), then it will be
* recalculated with link lowest tolerance
*/
tipc_node_read_lock(n);
n->keepalive_intv = 10000;
tipc_node_read_unlock(n);
for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
tipc_node_read_lock(n);
le = &n->links[bearer_id];
if (le->link) {
spin_lock_bh(&le->lock);
/* Link tolerance may change asynchronously: */
tipc_node_calculate_timer(n, le->link);
rc = tipc_link_timeout(le->link, &xmitq);
spin_unlock_bh(&le->lock);
remains--;
}
tipc_node_read_unlock(n);
tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
if (rc & TIPC_LINK_DOWN_EVT)
tipc_node_link_down(n, bearer_id, false);
}
mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
}
/**
* __tipc_node_link_up - handle addition of link
* @n: target tipc_node
* @bearer_id: id of the bearer
* @xmitq: queue for messages to be xmited on
* Node lock must be held by caller
* Link becomes active (alone or shared) or standby, depending on its priority.
*/
static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
struct sk_buff_head *xmitq)
{
int *slot0 = &n->active_links[0];
int *slot1 = &n->active_links[1];
struct tipc_link *ol = node_active_link(n, 0);
struct tipc_link *nl = n->links[bearer_id].link;
if (!nl || tipc_link_is_up(nl))
return;
tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
if (!tipc_link_is_up(nl))
return;
n->working_links++;
n->action_flags |= TIPC_NOTIFY_LINK_UP;
n->link_id = tipc_link_id(nl);
/* Leave room for tunnel header when returning 'mtu' to users: */
n->links[bearer_id].mtu = tipc_link_mss(nl);
tipc_bearer_add_dest(n->net, bearer_id, n->addr);
tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
pr_debug("Established link <%s> on network plane %c\n",
tipc_link_name(nl), tipc_link_plane(nl));
trace_tipc_node_link_up(n, true, " ");
/* Ensure that a STATE message goes first */
tipc_link_build_state_msg(nl, xmitq);
/* First link? => give it both slots */
if (!ol) {
*slot0 = bearer_id;
*slot1 = bearer_id;
tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
n->action_flags |= TIPC_NOTIFY_NODE_UP;
tipc_link_set_active(nl, true);
tipc_bcast_add_peer(n->net, nl, xmitq);
return;
}
/* Second link => redistribute slots */
if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
*slot0 = bearer_id;
*slot1 = bearer_id;
tipc_link_set_active(nl, true);
tipc_link_set_active(ol, false);
} else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
tipc_link_set_active(nl, true);
*slot1 = bearer_id;
} else {
pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
}
/* Prepare synchronization with first link */
tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
}
/**
* tipc_node_link_up - handle addition of link
* @n: target tipc_node
* @bearer_id: id of the bearer
* @xmitq: queue for messages to be xmited on
*
* Link becomes active (alone or shared) or standby, depending on its priority.
*/
static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
struct sk_buff_head *xmitq)
{
struct tipc_media_addr *maddr;
tipc_node_write_lock(n);
__tipc_node_link_up(n, bearer_id, xmitq);
maddr = &n->links[bearer_id].maddr;
tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
tipc_node_write_unlock(n);
}
/**
* tipc_node_link_failover() - start failover in case "half-failover"
*
* This function is only called in a very special situation where link
* failover can be already started on peer node but not on this node.
* This can happen when e.g.::
*
* 1. Both links <1A-2A>, <1B-2B> down
* 2. Link endpoint 2A up, but 1A still down (e.g. due to network
* disturbance, wrong session, etc.)
* 3. Link <1B-2B> up
* 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
* 5. Node 2 starts failover onto link <1B-2B>
*
* ==> Node 1 does never start link/node failover!
*
* @n: tipc node structure
* @l: link peer endpoint failingover (- can be NULL)
* @tnl: tunnel link
* @xmitq: queue for messages to be xmited on tnl link later
*/
static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
struct tipc_link *tnl,
struct sk_buff_head *xmitq)
{
/* Avoid to be "self-failover" that can never end */
if (!tipc_link_is_up(tnl))
return;
/* Don't rush, failure link may be in the process of resetting */
if (l && !tipc_link_is_reset(l))
return;
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
tipc_link_failover_prepare(l, tnl, xmitq);
if (l)
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
}
/**
* __tipc_node_link_down - handle loss of link
* @n: target tipc_node
* @bearer_id: id of the bearer
* @xmitq: queue for messages to be xmited on
* @maddr: output media address of the bearer
*/
static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
struct sk_buff_head *xmitq,
struct tipc_media_addr **maddr)
{
struct tipc_link_entry *le = &n->links[*bearer_id];
int *slot0 = &n->active_links[0];
int *slot1 = &n->active_links[1];
int i, highest = 0, prio;
struct tipc_link *l, *_l, *tnl;
l = n->links[*bearer_id].link;
if (!l || tipc_link_is_reset(l))
return;
n->working_links--;
n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
n->link_id = tipc_link_id(l);
tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
pr_debug("Lost link <%s> on network plane %c\n",
tipc_link_name(l), tipc_link_plane(l));
/* Select new active link if any available */
*slot0 = INVALID_BEARER_ID;
*slot1 = INVALID_BEARER_ID;
for (i = 0; i < MAX_BEARERS; i++) {
_l = n->links[i].link;
if (!_l || !tipc_link_is_up(_l))
continue;
if (_l == l)
continue;
prio = tipc_link_prio(_l);
if (prio < highest)
continue;
if (prio > highest) {
highest = prio;
*slot0 = i;
*slot1 = i;
continue;
}
*slot1 = i;
}
if (!node_is_up(n)) {
if (tipc_link_peer_is_down(l))
tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
tipc_link_fsm_evt(l, LINK_RESET_EVT);
tipc_link_reset(l);
tipc_link_build_reset_msg(l, xmitq);
*maddr = &n->links[*bearer_id].maddr;
node_lost_contact(n, &le->inputq);
tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
return;
}
tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
/* There is still a working link => initiate failover */
*bearer_id = n->active_links[0];
tnl = n->links[*bearer_id].link;
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
tipc_link_reset(l);
tipc_link_fsm_evt(l, LINK_RESET_EVT);
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
*maddr = &n->links[*bearer_id].maddr;
}
static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
{
struct tipc_link_entry *le = &n->links[bearer_id];
struct tipc_media_addr *maddr = NULL;
struct tipc_link *l = le->link;
int old_bearer_id = bearer_id;
struct sk_buff_head xmitq;
if (!l)
return;
__skb_queue_head_init(&xmitq);
tipc_node_write_lock(n);
if (!tipc_link_is_establishing(l)) {
__tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
} else {
/* Defuse pending tipc_node_link_up() */
tipc_link_reset(l);
tipc_link_fsm_evt(l, LINK_RESET_EVT);
}
if (delete) {
kfree(l);
le->link = NULL;
n->link_cnt--;
}
trace_tipc_node_link_down(n, true, "node link down or deleted!");
tipc_node_write_unlock(n);
if (delete)
tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
if (!skb_queue_empty(&xmitq))
tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
tipc_sk_rcv(n->net, &le->inputq);
}
static bool node_is_up(struct tipc_node *n)
{
return n->active_links[0] != INVALID_BEARER_ID;
}
bool tipc_node_is_up(struct net *net, u32 addr)
{
struct tipc_node *n;
bool retval = false;
if (in_own_node(net, addr))
return true;
n = tipc_node_find(net, addr);
if (!n)
return false;
retval = node_is_up(n);
tipc_node_put(n);
return retval;
}
static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
{
struct tipc_node *n;
addr ^= tipc_net(net)->random;
while ((n = tipc_node_find(net, addr))) {
tipc_node_put(n);
addr++;
}
return addr;
}
/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
* Returns suggested address if any, otherwise 0
*/
u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_node *n;
bool preliminary;
u32 sugg_addr;
/* Suggest new address if some other peer is using this one */
n = tipc_node_find(net, addr);
if (n) {
if (!memcmp(n->peer_id, id, NODE_ID_LEN))
addr = 0;
tipc_node_put(n);
if (!addr)
return 0;
return tipc_node_suggest_addr(net, addr);
}
/* Suggest previously used address if peer is known */
n = tipc_node_find_by_id(net, id);
if (n) {
sugg_addr = n->addr;
preliminary = n->preliminary;
tipc_node_put(n);
if (!preliminary)
return sugg_addr;
}
/* Even this node may be in conflict */
if (tn->trial_addr == addr)
return tipc_node_suggest_addr(net, addr);
return 0;
}
void tipc_node_check_dest(struct net *net, u32 addr,
u8 *peer_id, struct tipc_bearer *b,
u16 capabilities, u32 signature, u32 hash_mixes,
struct tipc_media_addr *maddr,
bool *respond, bool *dupl_addr)
{
struct tipc_node *n;
struct tipc_link *l, *snd_l;
struct tipc_link_entry *le;
bool addr_match = false;
bool sign_match = false;
bool link_up = false;
bool accept_addr = false;
bool reset = true;
char *if_name;
unsigned long intv;
u16 session;
*dupl_addr = false;
*respond = false;
n = tipc_node_create(net, addr, peer_id, capabilities, hash_mixes,
false);
if (!n)
return;
tipc_node_write_lock(n);
if (unlikely(!n->bc_entry.link)) {
snd_l = tipc_bc_sndlink(net);
if (!tipc_link_bc_create(net, tipc_own_addr(net),
addr, peer_id, U16_MAX,
tipc_link_min_win(snd_l),
tipc_link_max_win(snd_l),
n->capabilities,
&n->bc_entry.inputq1,
&n->bc_entry.namedq, snd_l,
&n->bc_entry.link)) {
pr_warn("Broadcast rcv link creation failed, no mem\n");
tipc_node_write_unlock_fast(n);
tipc_node_put(n);
return;
}
}
le = &n->links[b->identity];
/* Prepare to validate requesting node's signature and media address */
l = le->link;
link_up = l && tipc_link_is_up(l);
addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
sign_match = (signature == n->signature);
/* These three flags give us eight permutations: */
if (sign_match && addr_match && link_up) {
/* All is fine. Do nothing. */
reset = false;
/* Peer node is not a container/local namespace */
if (!n->peer_hash_mix)
n->peer_hash_mix = hash_mixes;
} else if (sign_match && addr_match && !link_up) {
/* Respond. The link will come up in due time */
*respond = true;
} else if (sign_match && !addr_match && link_up) {
/* Peer has changed i/f address without rebooting.
* If so, the link will reset soon, and the next
* discovery will be accepted. So we can ignore it.
* It may also be a cloned or malicious peer having
* chosen the same node address and signature as an
* existing one.
* Ignore requests until the link goes down, if ever.
*/
*dupl_addr = true;
} else if (sign_match && !addr_match && !link_up) {
/* Peer link has changed i/f address without rebooting.
* It may also be a cloned or malicious peer; we can't
* distinguish between the two.
* The signature is correct, so we must accept.
*/
accept_addr = true;
*respond = true;
} else if (!sign_match && addr_match && link_up) {
/* Peer node rebooted. Two possibilities:
* - Delayed re-discovery; this link endpoint has already
* reset and re-established contact with the peer, before
* receiving a discovery message from that node.
* (The peer happened to receive one from this node first).
* - The peer came back so fast that our side has not
* discovered it yet. Probing from this side will soon
* reset the link, since there can be no working link
* endpoint at the peer end, and the link will re-establish.
* Accept the signature, since it comes from a known peer.
*/
n->signature = signature;
} else if (!sign_match && addr_match && !link_up) {
/* The peer node has rebooted.
* Accept signature, since it is a known peer.
*/
n->signature = signature;
*respond = true;
} else if (!sign_match && !addr_match && link_up) {
/* Peer rebooted with new address, or a new/duplicate peer.
* Ignore until the link goes down, if ever.
*/
*dupl_addr = true;
} else if (!sign_match && !addr_match && !link_up) {
/* Peer rebooted with new address, or it is a new peer.
* Accept signature and address.
*/
n->signature = signature;
accept_addr = true;
*respond = true;
}
if (!accept_addr)
goto exit;
/* Now create new link if not already existing */
if (!l) {
if (n->link_cnt == 2)
goto exit;
if_name = strchr(b->name, ':') + 1;
get_random_bytes(&session, sizeof(u16));
if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
b->net_plane, b->mtu, b->priority,
b->min_win, b->max_win, session,
tipc_own_addr(net), addr, peer_id,
n->capabilities,
tipc_bc_sndlink(n->net), n->bc_entry.link,
&le->inputq,
&n->bc_entry.namedq, &l)) {
*respond = false;
goto exit;
}
trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
tipc_link_reset(l);
tipc_link_fsm_evt(l, LINK_RESET_EVT);
if (n->state == NODE_FAILINGOVER)
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
le->link = l;
n->link_cnt++;
tipc_node_calculate_timer(n, l);
if (n->link_cnt == 1) {
intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
if (!mod_timer(&n->timer, intv))
tipc_node_get(n);
}
}
memcpy(&le->maddr, maddr, sizeof(*maddr));
exit:
tipc_node_write_unlock(n);
if (reset && l && !tipc_link_is_reset(l))
tipc_node_link_down(n, b->identity, false);
tipc_node_put(n);
}
void tipc_node_delete_links(struct net *net, int bearer_id)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_node *n;
rcu_read_lock();
list_for_each_entry_rcu(n, &tn->node_list, list) {
tipc_node_link_down(n, bearer_id, true);
}
rcu_read_unlock();
}
static void tipc_node_reset_links(struct tipc_node *n)
{
int i;
pr_warn("Resetting all links to %x\n", n->addr);
trace_tipc_node_reset_links(n, true, " ");
for (i = 0; i < MAX_BEARERS; i++) {
tipc_node_link_down(n, i, false);
}
}
/* tipc_node_fsm_evt - node finite state machine
* Determines when contact is allowed with peer node
*/
static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
{
int state = n->state;
switch (state) {
case SELF_DOWN_PEER_DOWN:
switch (evt) {
case SELF_ESTABL_CONTACT_EVT:
state = SELF_UP_PEER_COMING;
break;
case PEER_ESTABL_CONTACT_EVT:
state = SELF_COMING_PEER_UP;
break;
case SELF_LOST_CONTACT_EVT:
case PEER_LOST_CONTACT_EVT:
break;
case NODE_SYNCH_END_EVT:
case NODE_SYNCH_BEGIN_EVT:
case NODE_FAILOVER_BEGIN_EVT:
case NODE_FAILOVER_END_EVT:
default:
goto illegal_evt;
}
break;
case SELF_UP_PEER_UP:
switch (evt) {
case SELF_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_LEAVING;
break;
case PEER_LOST_CONTACT_EVT:
state = SELF_LEAVING_PEER_DOWN;
break;
case NODE_SYNCH_BEGIN_EVT:
state = NODE_SYNCHING;
break;
case NODE_FAILOVER_BEGIN_EVT:
state = NODE_FAILINGOVER;
break;
case SELF_ESTABL_CONTACT_EVT:
case PEER_ESTABL_CONTACT_EVT:
case NODE_SYNCH_END_EVT:
case NODE_FAILOVER_END_EVT:
break;
default:
goto illegal_evt;
}
break;
case SELF_DOWN_PEER_LEAVING:
switch (evt) {
case PEER_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_DOWN;
break;
case SELF_ESTABL_CONTACT_EVT:
case PEER_ESTABL_CONTACT_EVT:
case SELF_LOST_CONTACT_EVT:
break;
case NODE_SYNCH_END_EVT:
case NODE_SYNCH_BEGIN_EVT:
case NODE_FAILOVER_BEGIN_EVT:
case NODE_FAILOVER_END_EVT:
default:
goto illegal_evt;
}
break;
case SELF_UP_PEER_COMING:
switch (evt) {
case PEER_ESTABL_CONTACT_EVT:
state = SELF_UP_PEER_UP;
break;
case SELF_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_DOWN;
break;
case SELF_ESTABL_CONTACT_EVT:
case PEER_LOST_CONTACT_EVT:
case NODE_SYNCH_END_EVT:
case NODE_FAILOVER_BEGIN_EVT:
break;
case NODE_SYNCH_BEGIN_EVT:
case NODE_FAILOVER_END_EVT:
default:
goto illegal_evt;
}
break;
case SELF_COMING_PEER_UP:
switch (evt) {
case SELF_ESTABL_CONTACT_EVT:
state = SELF_UP_PEER_UP;
break;
case PEER_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_DOWN;
break;
case SELF_LOST_CONTACT_EVT:
case PEER_ESTABL_CONTACT_EVT:
break;
case NODE_SYNCH_END_EVT:
case NODE_SYNCH_BEGIN_EVT:
case NODE_FAILOVER_BEGIN_EVT:
case NODE_FAILOVER_END_EVT:
default:
goto illegal_evt;
}
break;
case SELF_LEAVING_PEER_DOWN:
switch (evt) {
case SELF_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_DOWN;
break;
case SELF_ESTABL_CONTACT_EVT:
case PEER_ESTABL_CONTACT_EVT:
case PEER_LOST_CONTACT_EVT:
break;
case NODE_SYNCH_END_EVT:
case NODE_SYNCH_BEGIN_EVT:
case NODE_FAILOVER_BEGIN_EVT:
case NODE_FAILOVER_END_EVT:
default:
goto illegal_evt;
}
break;
case NODE_FAILINGOVER:
switch (evt) {
case SELF_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_LEAVING;
break;
case PEER_LOST_CONTACT_EVT:
state = SELF_LEAVING_PEER_DOWN;
break;
case NODE_FAILOVER_END_EVT:
state = SELF_UP_PEER_UP;
break;
case NODE_FAILOVER_BEGIN_EVT:
case SELF_ESTABL_CONTACT_EVT:
case PEER_ESTABL_CONTACT_EVT:
break;
case NODE_SYNCH_BEGIN_EVT:
case NODE_SYNCH_END_EVT:
default:
goto illegal_evt;
}
break;
case NODE_SYNCHING:
switch (evt) {
case SELF_LOST_CONTACT_EVT:
state = SELF_DOWN_PEER_LEAVING;
break;
case PEER_LOST_CONTACT_EVT:
state = SELF_LEAVING_PEER_DOWN;
break;
case NODE_SYNCH_END_EVT:
state = SELF_UP_PEER_UP;
break;
case NODE_FAILOVER_BEGIN_EVT:
state = NODE_FAILINGOVER;
break;
case NODE_SYNCH_BEGIN_EVT:
case SELF_ESTABL_CONTACT_EVT:
case PEER_ESTABL_CONTACT_EVT:
break;
case NODE_FAILOVER_END_EVT:
default:
goto illegal_evt;
}
break;
default:
pr_err("Unknown node fsm state %x\n", state);
break;
}
trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
n->state = state;
return;
illegal_evt:
pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
}
static void node_lost_contact(struct tipc_node *n,
struct sk_buff_head *inputq)
{
struct tipc_sock_conn *conn, *safe;
struct tipc_link *l;
struct list_head *conns = &n->conn_sks;
struct sk_buff *skb;
uint i;
pr_debug("Lost contact with %x\n", n->addr);
n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
trace_tipc_node_lost_contact(n, true, " ");
/* Clean up broadcast state */
tipc_bcast_remove_peer(n->net, n->bc_entry.link);
skb_queue_purge(&n->bc_entry.namedq);
/* Abort any ongoing link failover */
for (i = 0; i < MAX_BEARERS; i++) {
l = n->links[i].link;
if (l)
tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
}
/* Notify publications from this node */
n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
n->peer_net = NULL;
n->peer_hash_mix = 0;
/* Notify sockets connected to node */
list_for_each_entry_safe(conn, safe, conns, list) {
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
SHORT_H_SIZE, 0, tipc_own_addr(n->net),
conn->peer_node, conn->port,
conn->peer_port, TIPC_ERR_NO_NODE);
if (likely(skb))
skb_queue_tail(inputq, skb);
list_del(&conn->list);
kfree(conn);
}
}
/**
* tipc_node_get_linkname - get the name of a link
*
* @net: the applicable net namespace
* @bearer_id: id of the bearer
* @addr: peer node address
* @linkname: link name output buffer
* @len: size of @linkname output buffer
*
* Return: 0 on success
*/
int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
char *linkname, size_t len)
{
struct tipc_link *link;
int err = -EINVAL;
struct tipc_node *node = tipc_node_find(net, addr);
if (!node)
return err;
if (bearer_id >= MAX_BEARERS)
goto exit;
tipc_node_read_lock(node);
link = node->links[bearer_id].link;
if (link) {
strncpy(linkname, tipc_link_name(link), len);
err = 0;
}
tipc_node_read_unlock(node);
exit:
tipc_node_put(node);
return err;
}
/* Caller should hold node lock for the passed node */
static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
{
void *hdr;
struct nlattr *attrs;
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
NLM_F_MULTI, TIPC_NL_NODE_GET);
if (!hdr)
return -EMSGSIZE;
attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
if (!attrs)
goto msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
goto attr_msg_full;
if (node_is_up(node))
if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
goto attr_msg_full;
nla_nest_end(msg->skb, attrs);
genlmsg_end(msg->skb, hdr);
return 0;
attr_msg_full:
nla_nest_cancel(msg->skb, attrs);
msg_full:
genlmsg_cancel(msg->skb, hdr);
return -EMSGSIZE;
}
static void tipc_lxc_xmit(struct net *peer_net, struct sk_buff_head *list)
{
struct tipc_msg *hdr = buf_msg(skb_peek(list));
struct sk_buff_head inputq;
switch (msg_user(hdr)) {
case TIPC_LOW_IMPORTANCE:
case TIPC_MEDIUM_IMPORTANCE:
case TIPC_HIGH_IMPORTANCE:
case TIPC_CRITICAL_IMPORTANCE:
if (msg_connected(hdr) || msg_named(hdr) ||
msg_direct(hdr)) {
tipc_loopback_trace(peer_net, list);
spin_lock_init(&list->lock);
tipc_sk_rcv(peer_net, list);
return;
}
if (msg_mcast(hdr)) {
tipc_loopback_trace(peer_net, list);
skb_queue_head_init(&inputq);
tipc_sk_mcast_rcv(peer_net, list, &inputq);
__skb_queue_purge(list);
skb_queue_purge(&inputq);
return;
}
return;
case MSG_FRAGMENTER:
if (tipc_msg_assemble(list)) {
tipc_loopback_trace(peer_net, list);
skb_queue_head_init(&inputq);
tipc_sk_mcast_rcv(peer_net, list, &inputq);
__skb_queue_purge(list);
skb_queue_purge(&inputq);
}
return;
case GROUP_PROTOCOL:
case CONN_MANAGER:
tipc_loopback_trace(peer_net, list);
spin_lock_init(&list->lock);
tipc_sk_rcv(peer_net, list);
return;
case LINK_PROTOCOL:
case NAME_DISTRIBUTOR:
case TUNNEL_PROTOCOL:
case BCAST_PROTOCOL:
return;
default:
return;
}
}
/**
* tipc_node_xmit() - general link level function for message sending
* @net: the applicable net namespace
* @list: chain of buffers containing message
* @dnode: address of destination node
* @selector: a number used for deterministic link selection
* Consumes the buffer chain.
* Return: 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
*/
int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
u32 dnode, int selector)
{
struct tipc_link_entry *le = NULL;
struct tipc_node *n;
struct sk_buff_head xmitq;
bool node_up = false;
int bearer_id;
int rc;
if (in_own_node(net, dnode)) {
tipc_loopback_trace(net, list);
spin_lock_init(&list->lock);
tipc_sk_rcv(net, list);
return 0;
}
n = tipc_node_find(net, dnode);
if (unlikely(!n)) {
__skb_queue_purge(list);
return -EHOSTUNREACH;
}
tipc_node_read_lock(n);
node_up = node_is_up(n);
if (node_up && n->peer_net && check_net(n->peer_net)) {
/* xmit inner linux container */
tipc_lxc_xmit(n->peer_net, list);
if (likely(skb_queue_empty(list))) {
tipc_node_read_unlock(n);
tipc_node_put(n);
return 0;
}
}
bearer_id = n->active_links[selector & 1];
if (unlikely(bearer_id == INVALID_BEARER_ID)) {
tipc_node_read_unlock(n);
tipc_node_put(n);
__skb_queue_purge(list);
return -EHOSTUNREACH;
}
__skb_queue_head_init(&xmitq);
le = &n->links[bearer_id];
spin_lock_bh(&le->lock);
rc = tipc_link_xmit(le->link, list, &xmitq);
spin_unlock_bh(&le->lock);
tipc_node_read_unlock(n);
if (unlikely(rc == -ENOBUFS))
tipc_node_link_down(n, bearer_id, false);
else
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
tipc_node_put(n);
return rc;
}
/* tipc_node_xmit_skb(): send single buffer to destination
* Buffers sent via this function are generally TIPC_SYSTEM_IMPORTANCE
* messages, which will not be rejected
* The only exception is datagram messages rerouted after secondary
* lookup, which are rare and safe to dispose of anyway.
*/
int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
u32 selector)
{
struct sk_buff_head head;
__skb_queue_head_init(&head);
__skb_queue_tail(&head, skb);
tipc_node_xmit(net, &head, dnode, selector);
return 0;
}
/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
* Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
*/
int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
{
struct sk_buff *skb;
u32 selector, dnode;
while ((skb = __skb_dequeue(xmitq))) {
selector = msg_origport(buf_msg(skb));
dnode = msg_destnode(buf_msg(skb));
tipc_node_xmit_skb(net, skb, dnode, selector);
}
return 0;
}
void tipc_node_broadcast(struct net *net, struct sk_buff *skb, int rc_dests)
{
struct sk_buff_head xmitq;
struct sk_buff *txskb;
struct tipc_node *n;
u16 dummy;
u32 dst;
/* Use broadcast if all nodes support it */
if (!rc_dests && tipc_bcast_get_mode(net) != BCLINK_MODE_RCAST) {
__skb_queue_head_init(&xmitq);
__skb_queue_tail(&xmitq, skb);
tipc_bcast_xmit(net, &xmitq, &dummy);
return;
}
/* Otherwise use legacy replicast method */
rcu_read_lock();
list_for_each_entry_rcu(n, tipc_nodes(net), list) {
dst = n->addr;
if (in_own_node(net, dst))
continue;
if (!node_is_up(n))
continue;
txskb = pskb_copy(skb, GFP_ATOMIC);
if (!txskb)
break;
msg_set_destnode(buf_msg(txskb), dst);
tipc_node_xmit_skb(net, txskb, dst, 0);
}
rcu_read_unlock();
kfree_skb(skb);
}
static void tipc_node_mcast_rcv(struct tipc_node *n)
{
struct tipc_bclink_entry *be = &n->bc_entry;
/* 'arrvq' is under inputq2's lock protection */
spin_lock_bh(&be->inputq2.lock);
spin_lock_bh(&be->inputq1.lock);
skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
spin_unlock_bh(&be->inputq1.lock);
spin_unlock_bh(&be->inputq2.lock);
tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
}
static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
int bearer_id, struct sk_buff_head *xmitq)
{
struct tipc_link *ucl;
int rc;
rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq);
if (rc & TIPC_LINK_DOWN_EVT) {
tipc_node_reset_links(n);
return;
}
if (!(rc & TIPC_LINK_SND_STATE))
return;
/* If probe message, a STATE response will be sent anyway */
if (msg_probe(hdr))
return;
/* Produce a STATE message carrying broadcast NACK */
tipc_node_read_lock(n);
ucl = n->links[bearer_id].link;
if (ucl)
tipc_link_build_state_msg(ucl, xmitq);
tipc_node_read_unlock(n);
}
/**
* tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
* @net: the applicable net namespace
* @skb: TIPC packet
* @bearer_id: id of bearer message arrived on
*
* Invoked with no locks held.
*/
static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
{
int rc;
struct sk_buff_head xmitq;
struct tipc_bclink_entry *be;
struct tipc_link_entry *le;
struct tipc_msg *hdr = buf_msg(skb);
int usr = msg_user(hdr);
u32 dnode = msg_destnode(hdr);
struct tipc_node *n;
__skb_queue_head_init(&xmitq);
/* If NACK for other node, let rcv link for that node peek into it */
if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
n = tipc_node_find(net, dnode);
else
n = tipc_node_find(net, msg_prevnode(hdr));
if (!n) {
kfree_skb(skb);
return;
}
be = &n->bc_entry;
le = &n->links[bearer_id];
rc = tipc_bcast_rcv(net, be->link, skb);
/* Broadcast ACKs are sent on a unicast link */
if (rc & TIPC_LINK_SND_STATE) {
tipc_node_read_lock(n);
tipc_link_build_state_msg(le->link, &xmitq);
tipc_node_read_unlock(n);
}
if (!skb_queue_empty(&xmitq))
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
if (!skb_queue_empty(&be->inputq1))
tipc_node_mcast_rcv(n);
/* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
if (!skb_queue_empty(&n->bc_entry.namedq))
tipc_named_rcv(net, &n->bc_entry.namedq,
&n->bc_entry.named_rcv_nxt,
&n->bc_entry.named_open);
/* If reassembly or retransmission failure => reset all links to peer */
if (rc & TIPC_LINK_DOWN_EVT)
tipc_node_reset_links(n);
tipc_node_put(n);
}
/**
* tipc_node_check_state - check and if necessary update node state
* @n: target tipc_node
* @skb: TIPC packet
* @bearer_id: identity of bearer delivering the packet
* @xmitq: queue for messages to be xmited on
* Return: true if state and msg are ok, otherwise false
*/
static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
int bearer_id, struct sk_buff_head *xmitq)
{
struct tipc_msg *hdr = buf_msg(skb);
int usr = msg_user(hdr);
int mtyp = msg_type(hdr);
u16 oseqno = msg_seqno(hdr);
u16 exp_pkts = msg_msgcnt(hdr);
u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
int state = n->state;
struct tipc_link *l, *tnl, *pl = NULL;
struct tipc_media_addr *maddr;
int pb_id;
if (trace_tipc_node_check_state_enabled()) {
trace_tipc_skb_dump(skb, false, "skb for node state check");
trace_tipc_node_check_state(n, true, " ");
}
l = n->links[bearer_id].link;
if (!l)
return false;
rcv_nxt = tipc_link_rcv_nxt(l);
if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
return true;
/* Find parallel link, if any */
for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
if ((pb_id != bearer_id) && n->links[pb_id].link) {
pl = n->links[pb_id].link;
break;
}
}
if (!tipc_link_validate_msg(l, hdr)) {
trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
return false;
}
/* Check and update node accesibility if applicable */
if (state == SELF_UP_PEER_COMING) {
if (!tipc_link_is_up(l))
return true;
if (!msg_peer_link_is_up(hdr))
return true;
tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
}
if (state == SELF_DOWN_PEER_LEAVING) {
if (msg_peer_node_is_up(hdr))
return false;
tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
return true;
}
if (state == SELF_LEAVING_PEER_DOWN)
return false;
/* Ignore duplicate packets */
if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
return true;
/* Initiate or update failover mode if applicable */
if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
syncpt = oseqno + exp_pkts - 1;
if (pl && !tipc_link_is_reset(pl)) {
__tipc_node_link_down(n, &pb_id, xmitq, &maddr);
trace_tipc_node_link_down(n, true,
"node link down <- failover!");
tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
tipc_link_inputq(l));
}
/* If parallel link was already down, and this happened before
* the tunnel link came up, node failover was never started.
* Ensure that a FAILOVER_MSG is sent to get peer out of
* NODE_FAILINGOVER state, also this node must accept
* TUNNEL_MSGs from peer.
*/
if (n->state != NODE_FAILINGOVER)
tipc_node_link_failover(n, pl, l, xmitq);
/* If pkts arrive out of order, use lowest calculated syncpt */
if (less(syncpt, n->sync_point))
n->sync_point = syncpt;
}
/* Open parallel link when tunnel link reaches synch point */
if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
if (!more(rcv_nxt, n->sync_point))
return true;
tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
if (pl)
tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
return true;
}
/* No syncing needed if only one link */
if (!pl || !tipc_link_is_up(pl))
return true;
/* Initiate synch mode if applicable */
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
if (n->capabilities & TIPC_TUNNEL_ENHANCED)
syncpt = msg_syncpt(hdr);
else
syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
if (!tipc_link_is_up(l))
__tipc_node_link_up(n, bearer_id, xmitq);
if (n->state == SELF_UP_PEER_UP) {
n->sync_point = syncpt;
tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
}
}
/* Open tunnel link when parallel link reaches synch point */
if (n->state == NODE_SYNCHING) {
if (tipc_link_is_synching(l)) {
tnl = l;
} else {
tnl = pl;
pl = l;
}
inputq_len = skb_queue_len(tipc_link_inputq(pl));
dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
if (more(dlv_nxt, n->sync_point)) {
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
return true;
}
if (l == pl)
return true;
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
return true;
if (usr == LINK_PROTOCOL)
return true;
return false;
}
return true;
}
/**
* tipc_rcv - process TIPC packets/messages arriving from off-node
* @net: the applicable net namespace
* @skb: TIPC packet
* @b: pointer to bearer message arrived on
*
* Invoked with no locks held. Bearer pointer must point to a valid bearer
* structure (i.e. cannot be NULL), but bearer can be inactive.
*/
void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
{
struct sk_buff_head xmitq;
struct tipc_link_entry *le;
struct tipc_msg *hdr;
struct tipc_node *n;
int bearer_id = b->identity;
u32 self = tipc_own_addr(net);
int usr, rc = 0;
u16 bc_ack;
#ifdef CONFIG_TIPC_CRYPTO
struct tipc_ehdr *ehdr;
/* Check if message must be decrypted first */
if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
goto rcv;
ehdr = (struct tipc_ehdr *)skb->data;
if (likely(ehdr->user != LINK_CONFIG)) {
n = tipc_node_find(net, ntohl(ehdr->addr));
if (unlikely(!n))
goto discard;
} else {
n = tipc_node_find_by_id(net, ehdr->id);
}
tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
if (!skb)
return;
rcv:
#endif
/* Ensure message is well-formed before touching the header */
if (unlikely(!tipc_msg_validate(&skb)))
goto discard;
__skb_queue_head_init(&xmitq);
hdr = buf_msg(skb);
usr = msg_user(hdr);
bc_ack = msg_bcast_ack(hdr);
/* Handle arrival of discovery or broadcast packet */
if (unlikely(msg_non_seq(hdr))) {
if (unlikely(usr == LINK_CONFIG))
return tipc_disc_rcv(net, skb, b);
else
return tipc_node_bc_rcv(net, skb, bearer_id);
}
/* Discard unicast link messages destined for another node */
if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
goto discard;
/* Locate neighboring node that sent packet */
n = tipc_node_find(net, msg_prevnode(hdr));
if (unlikely(!n))
goto discard;
le = &n->links[bearer_id];
/* Ensure broadcast reception is in synch with peer's send state */
if (unlikely(usr == LINK_PROTOCOL)) {
if (unlikely(skb_linearize(skb))) {
tipc_node_put(n);
goto discard;
}
hdr = buf_msg(skb);
tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
} else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
}
/* Receive packet directly if conditions permit */
tipc_node_read_lock(n);
if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
spin_lock_bh(&le->lock);
if (le->link) {
rc = tipc_link_rcv(le->link, skb, &xmitq);
skb = NULL;
}
spin_unlock_bh(&le->lock);
}
tipc_node_read_unlock(n);
/* Check/update node state before receiving */
if (unlikely(skb)) {
if (unlikely(skb_linearize(skb)))
goto out_node_put;
tipc_node_write_lock(n);
if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
if (le->link) {
rc = tipc_link_rcv(le->link, skb, &xmitq);
skb = NULL;
}
}
tipc_node_write_unlock(n);
}
if (unlikely(rc & TIPC_LINK_UP_EVT))
tipc_node_link_up(n, bearer_id, &xmitq);
if (unlikely(rc & TIPC_LINK_DOWN_EVT))
tipc_node_link_down(n, bearer_id, false);
if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
tipc_named_rcv(net, &n->bc_entry.namedq,
&n->bc_entry.named_rcv_nxt,
&n->bc_entry.named_open);
if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
tipc_node_mcast_rcv(n);
if (!skb_queue_empty(&le->inputq))
tipc_sk_rcv(net, &le->inputq);
if (!skb_queue_empty(&xmitq))
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
out_node_put:
tipc_node_put(n);
discard:
kfree_skb(skb);
}
void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
int prop)
{
struct tipc_net *tn = tipc_net(net);
int bearer_id = b->identity;
struct sk_buff_head xmitq;
struct tipc_link_entry *e;
struct tipc_node *n;
__skb_queue_head_init(&xmitq);
rcu_read_lock();
list_for_each_entry_rcu(n, &tn->node_list, list) {
tipc_node_write_lock(n);
e = &n->links[bearer_id];
if (e->link) {
if (prop == TIPC_NLA_PROP_TOL)
tipc_link_set_tolerance(e->link, b->tolerance,
&xmitq);
else if (prop == TIPC_NLA_PROP_MTU)
tipc_link_set_mtu(e->link, b->mtu);
/* Update MTU for node link entry */
e->mtu = tipc_link_mss(e->link);
}
tipc_node_write_unlock(n);
tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
}
rcu_read_unlock();
}
int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
struct tipc_node *peer, *temp_node;
u8 node_id[NODE_ID_LEN];
u64 *w0 = (u64 *)&node_id[0];
u64 *w1 = (u64 *)&node_id[8];
u32 addr;
int err;
/* We identify the peer by its net */
if (!info->attrs[TIPC_NLA_NET])
return -EINVAL;
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
info->attrs[TIPC_NLA_NET],
tipc_nl_net_policy, info->extack);
if (err)
return err;
/* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
* mutually exclusive cases
*/
if (attrs[TIPC_NLA_NET_ADDR]) {
addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
if (!addr)
return -EINVAL;
}
if (attrs[TIPC_NLA_NET_NODEID]) {
if (!attrs[TIPC_NLA_NET_NODEID_W1])
return -EINVAL;
*w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
*w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
addr = hash128to32(node_id);
}
if (in_own_node(net, addr))
return -ENOTSUPP;
spin_lock_bh(&tn->node_list_lock);
peer = tipc_node_find(net, addr);
if (!peer) {
spin_unlock_bh(&tn->node_list_lock);
return -ENXIO;
}
tipc_node_write_lock(peer);
if (peer->state != SELF_DOWN_PEER_DOWN &&
peer->state != SELF_DOWN_PEER_LEAVING) {
tipc_node_write_unlock(peer);
err = -EBUSY;
goto err_out;
}
tipc_node_clear_links(peer);
tipc_node_write_unlock(peer);
tipc_node_delete(peer);
/* Calculate cluster capabilities */
tn->capabilities = TIPC_NODE_CAPABILITIES;
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
tn->capabilities &= temp_node->capabilities;
}
tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
err = 0;
err_out:
tipc_node_put(peer);
spin_unlock_bh(&tn->node_list_lock);
return err;
}
int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int err;
struct net *net = sock_net(skb->sk);
struct tipc_net *tn = net_generic(net, tipc_net_id);
int done = cb->args[0];
int last_addr = cb->args[1];
struct tipc_node *node;
struct tipc_nl_msg msg;
if (done)
return 0;
msg.skb = skb;
msg.portid = NETLINK_CB(cb->skb).portid;
msg.seq = cb->nlh->nlmsg_seq;
rcu_read_lock();
if (last_addr) {
node = tipc_node_find(net, last_addr);
if (!node) {
rcu_read_unlock();
/* We never set seq or call nl_dump_check_consistent()
* this means that setting prev_seq here will cause the
* consistence check to fail in the netlink callback
* handler. Resulting in the NLMSG_DONE message having
* the NLM_F_DUMP_INTR flag set if the node state
* changed while we released the lock.
*/
cb->prev_seq = 1;
return -EPIPE;
}
tipc_node_put(node);
}
list_for_each_entry_rcu(node, &tn->node_list, list) {
if (node->preliminary)
continue;
if (last_addr) {
if (node->addr == last_addr)
last_addr = 0;
else
continue;
}
tipc_node_read_lock(node);
err = __tipc_nl_add_node(&msg, node);
if (err) {
last_addr = node->addr;
tipc_node_read_unlock(node);
goto out;
}
tipc_node_read_unlock(node);
}
done = 1;
out:
cb->args[0] = done;
cb->args[1] = last_addr;
rcu_read_unlock();
return skb->len;
}
/* tipc_node_find_by_name - locate owner node of link by link's name
* @net: the applicable net namespace
* @name: pointer to link name string
* @bearer_id: pointer to index in 'node->links' array where the link was found.
*
* Returns pointer to node owning the link, or 0 if no matching link is found.
*/
static struct tipc_node *tipc_node_find_by_name(struct net *net,
const char *link_name,
unsigned int *bearer_id)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *l;
struct tipc_node *n;
struct tipc_node *found_node = NULL;
int i;
*bearer_id = 0;
rcu_read_lock();
list_for_each_entry_rcu(n, &tn->node_list, list) {
tipc_node_read_lock(n);
for (i = 0; i < MAX_BEARERS; i++) {
l = n->links[i].link;
if (l && !strcmp(tipc_link_name(l), link_name)) {
*bearer_id = i;
found_node = n;
break;
}
}
tipc_node_read_unlock(n);
if (found_node)
break;
}
rcu_read_unlock();
return found_node;
}
int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
{
int err;
int res = 0;
int bearer_id;
char *name;
struct tipc_link *link;
struct tipc_node *node;
struct sk_buff_head xmitq;
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
struct net *net = sock_net(skb->sk);
__skb_queue_head_init(&xmitq);
if (!info->attrs[TIPC_NLA_LINK])
return -EINVAL;
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
info->attrs[TIPC_NLA_LINK],
tipc_nl_link_policy, info->extack);
if (err)
return err;
if (!attrs[TIPC_NLA_LINK_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
if (strcmp(name, tipc_bclink_name) == 0)
return tipc_nl_bc_link_set(net, attrs);
node = tipc_node_find_by_name(net, name, &bearer_id);
if (!node)
return -EINVAL;
tipc_node_read_lock(node);
link = node->links[bearer_id].link;
if (!link) {
res = -EINVAL;
goto out;
}
if (attrs[TIPC_NLA_LINK_PROP]) {
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
if (err) {
res = err;
goto out;
}
if (props[TIPC_NLA_PROP_TOL]) {
u32 tol;
tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
tipc_link_set_tolerance(link, tol, &xmitq);
}
if (props[TIPC_NLA_PROP_PRIO]) {
u32 prio;
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
tipc_link_set_prio(link, prio, &xmitq);
}
if (props[TIPC_NLA_PROP_WIN]) {
u32 max_win;
max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
tipc_link_set_queue_limits(link,
tipc_link_min_win(link),
max_win);
}
}
out:
tipc_node_read_unlock(node);
tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
NULL);
return res;
}
int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = genl_info_net(info);
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
struct tipc_nl_msg msg;
char *name;
int err;
msg.portid = info->snd_portid;
msg.seq = info->snd_seq;
if (!info->attrs[TIPC_NLA_LINK])
return -EINVAL;
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
info->attrs[TIPC_NLA_LINK],
tipc_nl_link_policy, info->extack);
if (err)
return err;
if (!attrs[TIPC_NLA_LINK_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg.skb)
return -ENOMEM;
if (strcmp(name, tipc_bclink_name) == 0) {
err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
if (err)
goto err_free;
} else {
int bearer_id;
struct tipc_node *node;
struct tipc_link *link;
node = tipc_node_find_by_name(net, name, &bearer_id);
if (!node) {
err = -EINVAL;
goto err_free;
}
tipc_node_read_lock(node);
link = node->links[bearer_id].link;
if (!link) {
tipc_node_read_unlock(node);
err = -EINVAL;
goto err_free;
}
err = __tipc_nl_add_link(net, &msg, link, 0);
tipc_node_read_unlock(node);
if (err)
goto err_free;
}
return genlmsg_reply(msg.skb, info);
err_free:
nlmsg_free(msg.skb);
return err;
}
int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *link_name;
unsigned int bearer_id;
struct tipc_link *link;
struct tipc_node *node;
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
struct net *net = sock_net(skb->sk);
struct tipc_net *tn = tipc_net(net);
struct tipc_link_entry *le;
if (!info->attrs[TIPC_NLA_LINK])
return -EINVAL;
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
info->attrs[TIPC_NLA_LINK],
tipc_nl_link_policy, info->extack);
if (err)
return err;
if (!attrs[TIPC_NLA_LINK_NAME])
return -EINVAL;
link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
err = -EINVAL;
if (!strcmp(link_name, tipc_bclink_name)) {
err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
if (err)
return err;
return 0;
} else if (strstr(link_name, tipc_bclink_name)) {
rcu_read_lock();
list_for_each_entry_rcu(node, &tn->node_list, list) {
tipc_node_read_lock(node);
link = node->bc_entry.link;
if (link && !strcmp(link_name, tipc_link_name(link))) {
err = tipc_bclink_reset_stats(net, link);
tipc_node_read_unlock(node);
break;
}
tipc_node_read_unlock(node);
}
rcu_read_unlock();
return err;
}
node = tipc_node_find_by_name(net, link_name, &bearer_id);
if (!node)
return -EINVAL;
le = &node->links[bearer_id];
tipc_node_read_lock(node);
spin_lock_bh(&le->lock);
link = node->links[bearer_id].link;
if (!link) {
spin_unlock_bh(&le->lock);
tipc_node_read_unlock(node);
return -EINVAL;
}
tipc_link_reset_stats(link);
spin_unlock_bh(&le->lock);
tipc_node_read_unlock(node);
return 0;
}
/* Caller should hold node lock */
static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
struct tipc_node *node, u32 *prev_link,
bool bc_link)
{
u32 i;
int err;
for (i = *prev_link; i < MAX_BEARERS; i++) {
*prev_link = i;
if (!node->links[i].link)
continue;
err = __tipc_nl_add_link(net, msg,
node->links[i].link, NLM_F_MULTI);
if (err)
return err;
}
if (bc_link) {
*prev_link = i;
err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
if (err)
return err;
}
*prev_link = 0;
return 0;
}
int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_node *node;
struct tipc_nl_msg msg;
u32 prev_node = cb->args[0];
u32 prev_link = cb->args[1];
int done = cb->args[2];
bool bc_link = cb->args[3];
int err;
if (done)
return 0;
if (!prev_node) {
/* Check if broadcast-receiver links dumping is needed */
if (attrs && attrs[TIPC_NLA_LINK]) {
err = nla_parse_nested_deprecated(link,
TIPC_NLA_LINK_MAX,
attrs[TIPC_NLA_LINK],
tipc_nl_link_policy,
NULL);
if (unlikely(err))
return err;
if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
return -EINVAL;
bc_link = true;
}
}
msg.skb = skb;
msg.portid = NETLINK_CB(cb->skb).portid;
msg.seq = cb->nlh->nlmsg_seq;
rcu_read_lock();
if (prev_node) {
node = tipc_node_find(net, prev_node);
if (!node) {
/* We never set seq or call nl_dump_check_consistent()
* this means that setting prev_seq here will cause the
* consistence check to fail in the netlink callback
* handler. Resulting in the last NLMSG_DONE message
* having the NLM_F_DUMP_INTR flag set.
*/
cb->prev_seq = 1;
goto out;
}
tipc_node_put(node);
list_for_each_entry_continue_rcu(node, &tn->node_list,
list) {
tipc_node_read_lock(node);
err = __tipc_nl_add_node_links(net, &msg, node,
&prev_link, bc_link);
tipc_node_read_unlock(node);
if (err)
goto out;
prev_node = node->addr;
}
} else {
err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
if (err)
goto out;
list_for_each_entry_rcu(node, &tn->node_list, list) {
tipc_node_read_lock(node);
err = __tipc_nl_add_node_links(net, &msg, node,
&prev_link, bc_link);
tipc_node_read_unlock(node);
if (err)
goto out;
prev_node = node->addr;
}
}
done = 1;
out:
rcu_read_unlock();
cb->args[0] = prev_node;
cb->args[1] = prev_link;
cb->args[2] = done;
cb->args[3] = bc_link;
return skb->len;
}
int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
struct net *net = sock_net(skb->sk);
int err;
if (!info->attrs[TIPC_NLA_MON])
return -EINVAL;
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
info->attrs[TIPC_NLA_MON],
tipc_nl_monitor_policy,
info->extack);
if (err)
return err;
if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
u32 val;
val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
err = tipc_nl_monitor_set_threshold(net, val);
if (err)
return err;
}
return 0;
}
static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
{
struct nlattr *attrs;
void *hdr;
u32 val;
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
0, TIPC_NL_MON_GET);
if (!hdr)
return -EMSGSIZE;
attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
if (!attrs)
goto msg_full;
val = tipc_nl_monitor_get_threshold(net);
if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
goto attr_msg_full;
nla_nest_end(msg->skb, attrs);
genlmsg_end(msg->skb, hdr);
return 0;
attr_msg_full:
nla_nest_cancel(msg->skb, attrs);
msg_full:
genlmsg_cancel(msg->skb, hdr);
return -EMSGSIZE;
}
int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
struct tipc_nl_msg msg;
int err;
msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg.skb)
return -ENOMEM;
msg.portid = info->snd_portid;
msg.seq = info->snd_seq;
err = __tipc_nl_add_monitor_prop(net, &msg);
if (err) {
nlmsg_free(msg.skb);
return err;
}
return genlmsg_reply(msg.skb, info);
}
int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
u32 prev_bearer = cb->args[0];
struct tipc_nl_msg msg;
int bearer_id;
int err;
if (prev_bearer == MAX_BEARERS)
return 0;
msg.skb = skb;
msg.portid = NETLINK_CB(cb->skb).portid;
msg.seq = cb->nlh->nlmsg_seq;
rtnl_lock();
for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
err = __tipc_nl_add_monitor(net, &msg, bearer_id);
if (err)
break;
}
rtnl_unlock();
cb->args[0] = bearer_id;
return skb->len;
}
int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
u32 prev_node = cb->args[1];
u32 bearer_id = cb->args[2];
int done = cb->args[0];
struct tipc_nl_msg msg;
int err;
if (!prev_node) {
struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
if (!attrs[TIPC_NLA_MON])
return -EINVAL;
err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
attrs[TIPC_NLA_MON],
tipc_nl_monitor_policy,
NULL);
if (err)
return err;
if (!mon[TIPC_NLA_MON_REF])
return -EINVAL;
bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
if (bearer_id >= MAX_BEARERS)
return -EINVAL;
}
if (done)
return 0;
msg.skb = skb;
msg.portid = NETLINK_CB(cb->skb).portid;
msg.seq = cb->nlh->nlmsg_seq;
rtnl_lock();
err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
if (!err)
done = 1;
rtnl_unlock();
cb->args[0] = done;
cb->args[1] = prev_node;
cb->args[2] = bearer_id;
return skb->len;
}
#ifdef CONFIG_TIPC_CRYPTO
static int tipc_nl_retrieve_key(struct nlattr **attrs,
struct tipc_aead_key **pkey)
{
struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
struct tipc_aead_key *key;
if (!attr)
return -ENODATA;
if (nla_len(attr) < sizeof(*key))
return -EINVAL;
key = (struct tipc_aead_key *)nla_data(attr);
if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
nla_len(attr) < tipc_aead_key_size(key))
return -EINVAL;
*pkey = key;
return 0;
}
static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
{
struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
if (!attr)
return -ENODATA;
if (nla_len(attr) < TIPC_NODEID_LEN)
return -EINVAL;
*node_id = (u8 *)nla_data(attr);
return 0;
}
static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
{
struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
if (!attr)
return -ENODATA;
*intv = nla_get_u32(attr);
return 0;
}
static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
struct net *net = sock_net(skb->sk);
struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
struct tipc_node *n = NULL;
struct tipc_aead_key *ukey;
bool rekeying = true, master_key = false;
u8 *id, *own_id, mode;
u32 intv = 0;
int rc = 0;
if (!info->attrs[TIPC_NLA_NODE])
return -EINVAL;
rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
info->attrs[TIPC_NLA_NODE],
tipc_nl_node_policy, info->extack);
if (rc)
return rc;
own_id = tipc_own_id(net);
if (!own_id) {
GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
return -EPERM;
}
rc = tipc_nl_retrieve_rekeying(attrs, &intv);
if (rc == -ENODATA)
rekeying = false;
rc = tipc_nl_retrieve_key(attrs, &ukey);
if (rc == -ENODATA && rekeying)
goto rekeying;
else if (rc)
return rc;
rc = tipc_aead_key_validate(ukey, info);
if (rc)
return rc;
rc = tipc_nl_retrieve_nodeid(attrs, &id);
switch (rc) {
case -ENODATA:
mode = CLUSTER_KEY;
master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
break;
case 0:
mode = PER_NODE_KEY;
if (memcmp(id, own_id, NODE_ID_LEN)) {
n = tipc_node_find_by_id(net, id) ?:
tipc_node_create(net, 0, id, 0xffffu, 0, true);
if (unlikely(!n))
return -ENOMEM;
c = n->crypto_rx;
}
break;
default:
return rc;
}
/* Initiate the TX/RX key */
rc = tipc_crypto_key_init(c, ukey, mode, master_key);
if (n)
tipc_node_put(n);
if (unlikely(rc < 0)) {
GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
return rc;
} else if (c == tx) {
/* Distribute TX key but not master one */
if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
GENL_SET_ERR_MSG(info, "failed to replicate new key");
rekeying:
/* Schedule TX rekeying if needed */
tipc_crypto_rekeying_sched(tx, rekeying, intv);
}
return 0;
}
int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
{
int err;
rtnl_lock();
err = __tipc_nl_node_set_key(skb, info);
rtnl_unlock();
return err;
}
static int __tipc_nl_node_flush_key(struct sk_buff *skb,
struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
struct tipc_net *tn = tipc_net(net);
struct tipc_node *n;
tipc_crypto_key_flush(tn->crypto_tx);
rcu_read_lock();
list_for_each_entry_rcu(n, &tn->node_list, list)
tipc_crypto_key_flush(n->crypto_rx);
rcu_read_unlock();
return 0;
}
int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
{
int err;
rtnl_lock();
err = __tipc_nl_node_flush_key(skb, info);
rtnl_unlock();
return err;
}
#endif
/**
* tipc_node_dump - dump TIPC node data
* @n: tipc node to be dumped
* @more: dump more?
* - false: dump only tipc node data
* - true: dump node link data as well
* @buf: returned buffer of dump data in format
*/
int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
{
int i = 0;
size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
if (!n) {
i += scnprintf(buf, sz, "node data: (null)\n");
return i;
}
i += scnprintf(buf, sz, "node data: %x", n->addr);
i += scnprintf(buf + i, sz - i, " %x", n->state);
i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
i += scnprintf(buf + i, sz - i, " %u", n->working_links);
i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
if (!more)
return i;
i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
i += scnprintf(buf + i, sz - i, " media: ");
i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
i += scnprintf(buf + i, sz - i, "\n");
i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
i += scnprintf(buf + i, sz - i, " inputq: ");
i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
i += scnprintf(buf + i, sz - i, " media: ");
i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
i += scnprintf(buf + i, sz - i, "\n");
i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
i += scnprintf(buf + i, sz - i, " inputq: ");
i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
i += scnprintf(buf + i, sz - i, "bclink:\n ");
i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
return i;
}
void tipc_node_pre_cleanup_net(struct net *exit_net)
{
struct tipc_node *n;
struct tipc_net *tn;
struct net *tmp;
rcu_read_lock();
for_each_net_rcu(tmp) {
if (tmp == exit_net)
continue;
tn = tipc_net(tmp);
if (!tn)
continue;
spin_lock_bh(&tn->node_list_lock);
list_for_each_entry_rcu(n, &tn->node_list, list) {
if (!n->peer_net)
continue;
if (n->peer_net != exit_net)
continue;
tipc_node_write_lock(n);
n->peer_net = NULL;
n->peer_hash_mix = 0;
tipc_node_write_unlock_fast(n);
break;
}
spin_unlock_bh(&tn->node_list_lock);
}
rcu_read_unlock();
}