| /* |
| * 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" |
| |
| #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; |
| }; |
| |
| /** |
| * 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 |
| * @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 |
| */ |
| 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 failover_sent; |
| u16 sync_point; |
| int link_cnt; |
| u16 working_links; |
| u16 capabilities; |
| u32 signature; |
| u32 link_id; |
| u8 peer_id[16]; |
| 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; |
| }; |
| |
| /* 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 void tipc_node_put(struct tipc_node *node); |
| 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) |
| { |
| struct tipc_node *n; |
| int bearer_id; |
| unsigned int mtu = MAX_MSG_SIZE; |
| |
| n = tipc_node_find(net, addr); |
| if (unlikely(!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; |
| } |
| |
| 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); |
| kfree_rcu(n, rcu); |
| } |
| |
| static 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) |
| 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); |
| |
| if (flags & TIPC_NOTIFY_NODE_UP) |
| tipc_named_node_up(net, addr); |
| |
| 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 struct tipc_node *tipc_node_create(struct net *net, u32 addr, |
| u8 *peer_id, u16 capabilities) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct tipc_node *n, *temp_node; |
| struct tipc_link *l; |
| int bearer_id; |
| int i; |
| |
| spin_lock_bh(&tn->node_list_lock); |
| n = tipc_node_find(net, addr); |
| if (n) { |
| 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; |
| } |
| goto exit; |
| } |
| n = kzalloc(sizeof(*n), GFP_ATOMIC); |
| if (!n) { |
| pr_warn("Node creation failed, no memory\n"); |
| goto exit; |
| } |
| n->addr = addr; |
| memcpy(&n->peer_id, peer_id, 16); |
| n->net = net; |
| 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 (!tipc_link_bc_create(net, tipc_own_addr(net), |
| addr, U16_MAX, |
| tipc_link_window(tipc_bc_sndlink(net)), |
| n->capabilities, |
| &n->bc_entry.inputq1, |
| &n->bc_entry.namedq, |
| tipc_bc_sndlink(net), |
| &n->bc_entry.link)) { |
| pr_warn("Broadcast rcv link creation failed, no memory\n"); |
| kfree(n); |
| n = NULL; |
| goto exit; |
| } |
| tipc_node_get(n); |
| timer_setup(&n->timer, tipc_node_timeout, 0); |
| n->keepalive_intv = U32_MAX; |
| 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; |
| } |
| 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); |
| |
| /* Calculate cluster capabilities */ |
| tn->capabilities = TIPC_NODE_CAPABILITIES; |
| list_for_each_entry_rcu(temp_node, &tn->node_list, list) { |
| tn->capabilities &= temp_node->capabilities; |
| } |
| |
| 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; |
| } |
| |
| __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); |
| 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_mtu(nl) - INT_H_SIZE; |
| |
| 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); |
| 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); |
| 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; |
| |
| /* 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) { |
| addr = n->addr; |
| tipc_node_put(n); |
| return 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, |
| 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 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); |
| 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); |
| 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; |
| } 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->window, 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); |
| |
| /* 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; |
| |
| /* 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; |
| } |
| |
| /** |
| * 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; |
| 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); |
| 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); |
| |
| 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) |
| { |
| struct sk_buff *txskb; |
| struct tipc_node *n; |
| u32 dst; |
| |
| 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); |
| |
| 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); |
| |
| 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); |
| |
| /* 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_node *n; |
| struct tipc_msg *hdr; |
| int bearer_id = b->identity; |
| struct tipc_link_entry *le; |
| u32 self = tipc_own_addr(net); |
| int usr, rc = 0; |
| u16 bc_ack; |
| |
| __skb_queue_head_init(&xmitq); |
| |
| /* Ensure message is well-formed before touching the header */ |
| TIPC_SKB_CB(skb)->validated = false; |
| if (unlikely(!tipc_msg_validate(&skb))) |
| goto discard; |
| 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)) |
| 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 discard; |
| 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); |
| |
| 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); |
| |
| 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); |
| } |
| |
| 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; |
| 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); |
| |
| 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 (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 win; |
| |
| win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| tipc_link_set_queue_limits(link, win); |
| } |
| } |
| |
| out: |
| tipc_node_read_unlock(node); |
| tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr); |
| 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); |
| 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_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]); |
| |
| if (strcmp(link_name, tipc_bclink_name) == 0) { |
| err = tipc_bclink_reset_stats(net); |
| if (err) |
| return err; |
| return 0; |
| } |
| |
| 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) |
| { |
| 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; |
| } |
| *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 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]; |
| int err; |
| |
| if (done) |
| return 0; |
| |
| 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); |
| tipc_node_read_unlock(node); |
| if (err) |
| goto out; |
| |
| prev_node = node->addr; |
| } |
| } else { |
| err = tipc_nl_add_bc_link(net, &msg); |
| 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); |
| 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; |
| |
| 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; |
| struct nlattr *mon[TIPC_NLA_MON_MAX + 1]; |
| |
| err = tipc_nlmsg_parse(cb->nlh, &attrs); |
| if (err) |
| return err; |
| |
| 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; |
| } |
| |
| u32 tipc_node_get_addr(struct tipc_node *node) |
| { |
| return (node) ? node->addr : 0; |
| } |
| |
| /** |
| * 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; |
| } |