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linux/net/tipc/node.c
Hoang Huu Le cad2929dc4 tipc: update a binding service via broadcast 
Currently, updating binding table (add service binding to
name table/withdraw a service binding) is being sent over replicast.
However, if we are scaling up clusters to > 100 nodes/containers this
method is less affection because of looping through nodes in a cluster one
by one.

It is worth to use broadcast to update a binding service. This way, the
binding table can be updated on all peer nodes in one shot.

Broadcast is used when all peer nodes, as indicated by a new capability
flag TIPC_NAMED_BCAST, support reception of this message type.

Four problems need to be considered when introducing this feature.
1) When establishing a link to a new peer node we still update this by a
unicast 'bulk' update. This may lead to race conditions, where a later
broadcast publication/withdrawal bypass the 'bulk', resulting in
disordered publications, or even that a withdrawal may arrive before the
corresponding publication. We solve this by adding an 'is_last_bulk' bit
in the last bulk messages so that it can be distinguished from all other
messages. Only when this message has arrived do we open up for reception
of broadcast publications/withdrawals.

2) When a first legacy node is added to the cluster all distribution
will switch over to use the legacy 'replicast' method, while the
opposite happens when the last legacy node leaves the cluster. This
entails another risk of message disordering that has to be handled. We
solve this by adding a sequence number to the broadcast/replicast
messages, so that disordering can be discovered and corrected. Note
however that we don't need to consider potential message loss or
duplication at this protocol level.

3) Bulk messages don't contain any sequence numbers, and will always
arrive in order. Hence we must exempt those from the sequence number
control and deliver them unconditionally. We solve this by adding a new
'is_bulk' bit in those messages so that they can be recognized.

4) Legacy messages, which don't contain any new bits or sequence
numbers, but neither can arrive out of order, also need to be exempt
from the initial synchronization and sequence number check, and
delivered unconditionally. Therefore, we add another 'is_not_legacy' bit
to all new messages so that those can be distinguished from legacy
messages and the latter delivered directly.

v1->v2:
 - fix warning issue reported by kbuild test robot <lkp@intel.com>
 - add santiy check to drop the publication message with a sequence
number that is lower than the agreed synch point

Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Hoang Huu Le <hoang.h.le@dektech.com.au>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-17 08:53:34 -07:00

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/*
* 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
* @ref: 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
* @action_flags: bit mask of different types of node actions
* @state: connectivity state vs peer node
* @preliminary: a preliminary node 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
* @publ_list: list of publications
* @rcu: rcu struct for tipc_node
* @delete_at: indicates the time for deleting a down node
* @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
* 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;
}
#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);
}
static 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)
{
read_lock_bh(&n->lock);
}
static void tipc_node_read_unlock(struct tipc_node *n)
{
read_unlock_bh(&n->lock);
}
static void tipc_node_write_lock(struct tipc_node *n)
{
write_lock_bh(&n->lock);
}
static void tipc_node_write_unlock_fast(struct tipc_node *n)
{
write_unlock_bh(&n->lock);
}
static void tipc_node_write_unlock(struct tipc_node *n)
{
struct net *net = n->net;
u32 addr = 0;
u32 flags = n->action_flags;
u32 link_id = 0;
u32 bearer_id;
struct list_head *publ_list;
if (likely(!flags)) {
write_unlock_bh(&n->lock);
return;
}
addr = n->addr;
link_id = n->link_id;
bearer_id = 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, addr, n->capabilities);
if (flags & TIPC_NOTIFY_NODE_UP)
tipc_named_node_up(net, addr, n->capabilities);
if (flags & TIPC_NOTIFY_LINK_UP) {
tipc_mon_peer_up(net, addr, bearer_id);
tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
TIPC_NODE_SCOPE, link_id, link_id);
}
if (flags & TIPC_NOTIFY_LINK_DOWN) {
tipc_mon_peer_down(net, addr, bearer_id);
tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
addr, link_id);
}
}
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)
{
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
* 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
*
* 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
*/
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 an 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
*
* @bearer_id: id of the bearer
* @node: peer node address
* @linkname: link name output buffer
*
* Returns 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() is the 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.
* Returns 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 functon 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
* @skb: TIPC packet
* @bearer_id: identity of bearer delivering the packet
* Returns 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 synching 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
* @bearer: 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);
}
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;
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;
if (!attrs[TIPC_NLA_NET_ADDR])
return -EINVAL;
addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
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 **key)
{
struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
if (!attr)
return -ENODATA;
*key = (struct tipc_aead_key *)nla_data(attr);
if (nla_len(attr) < tipc_aead_key_size(*key))
return -EINVAL;
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_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_net *tn = tipc_net(net);
struct tipc_node *n = NULL;
struct tipc_aead_key *ukey;
struct tipc_crypto *c;
u8 *id, *own_id;
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)
goto exit;
own_id = tipc_own_id(net);
if (!own_id) {
rc = -EPERM;
goto exit;
}
rc = tipc_nl_retrieve_key(attrs, &ukey);
if (rc)
goto exit;
rc = tipc_aead_key_validate(ukey);
if (rc)
goto exit;
rc = tipc_nl_retrieve_nodeid(attrs, &id);
switch (rc) {
case -ENODATA:
/* Cluster key mode */
rc = tipc_crypto_key_init(tn->crypto_tx, ukey, CLUSTER_KEY);
break;
case 0:
/* Per-node key mode */
if (!memcmp(id, own_id, NODE_ID_LEN)) {
c = tn->crypto_tx;
} else {
n = tipc_node_find_by_id(net, id) ?:
tipc_node_create(net, 0, id, 0xffffu, 0, true);
if (unlikely(!n)) {
rc = -ENOMEM;
break;
}
c = n->crypto_rx;
}
rc = tipc_crypto_key_init(c, ukey, PER_NODE_KEY);
if (n)
tipc_node_put(n);
break;
default:
break;
}
exit:
return (rc < 0) ? rc : 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();
pr_info("All keys are flushed!\n");
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();
}
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