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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
- * @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, node;
- 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 = tipc_own_addr(net);
- 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, node, n->capabilities);
- if (flags & TIPC_NOTIFY_NODE_UP)
- tipc_named_node_up(net, node, n->capabilities);
- if (flags & TIPC_NOTIFY_LINK_UP) {
- tipc_mon_peer_up(net, node, bearer_id);
- tipc_nametbl_publish(net, &ua, &sk, sk.ref);
- }
- if (flags & TIPC_NOTIFY_LINK_DOWN) {
- tipc_mon_peer_down(net, 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_link *l, *snd_l = tipc_bc_sndlink(net);
- struct tipc_node *n, *temp_node;
- 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);
- 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 refresh failed, no memory\n");
- tipc_node_write_unlock_fast(n);
- tipc_node_put(n);
- n = NULL;
- goto exit;
- }
- 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;
- if (!preliminary &&
- !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 memory\n");
- tipc_node_put(n);
- n = NULL;
- goto exit;
- }
- 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;
- struct tipc_link_entry *le;
- bool addr_match = false;
- bool sign_match = false;
- bool link_up = false;
- bool link_is_reset = false;
- bool accept_addr = false;
- bool reset = false;
- 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);
- 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);
- link_is_reset = l && tipc_link_is_reset(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. Ignore requests. */
- /* 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;
- reset = 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;
- reset = 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);
- link_is_reset = tipc_link_is_reset(l);
- 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 && !link_is_reset)
- 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;
- struct net *peer_net;
- 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;
- }
- rcu_read_lock();
- tipc_node_read_lock(n);
- node_up = node_is_up(n);
- peer_net = n->peer_net;
- tipc_node_read_unlock(n);
- if (node_up && peer_net && check_net(peer_net)) {
- /* xmit inner linux container */
- tipc_lxc_xmit(peer_net, list);
- if (likely(skb_queue_empty(list))) {
- rcu_read_unlock();
- tipc_node_put(n);
- return 0;
- }
- }
- rcu_read_unlock();
- tipc_node_read_lock(n);
- 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();
- }
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