cregit-Linux how code gets into the kernel

Release 4.11 net/tipc/node.c

Directory: net/tipc
/*
 * 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"


#define INVALID_NODE_SIG	0x10000

/* 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
 */

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;
	
u16 sync_point;
	
int link_cnt;
	
u16 working_links;
	
u16 capabilities;
	
u32 signature;
	
u32 link_id;
	
struct list_head publ_list;
	
struct list_head conn_sks;
	
unsigned long keepalive_intv;
	
struct timer_list timer;
	
struct rcu_head rcu;
};

/* 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(unsigned long data);
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 void tipc_node_put(struct tipc_node *node);
static bool tipc_node_is_up(struct tipc_node *n);


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy50100.00%1100.00%
Total50100.00%1100.00%


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; }

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PersonTokensPropCommitsCommitProp
Jon Paul Maloy89100.00%1100.00%
Total89100.00%1100.00%


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; }

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Jon Paul Maloy55100.00%1100.00%
Total55100.00%1100.00%


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); }

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PersonTokensPropCommitsCommitProp
Ying Xue2866.67%150.00%
Jon Paul Maloy1433.33%150.00%
Total42100.00%2100.00%


static void tipc_node_put(struct tipc_node *node) { kref_put(&node->kref, tipc_node_kref_release); }

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Ying Xue2095.24%150.00%
Jon Paul Maloy14.76%150.00%
Total21100.00%2100.00%


static void tipc_node_get(struct tipc_node *node) { kref_get(&node->kref); }

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Ying Xue19100.00%1100.00%
Total19100.00%1100.00%

/* * 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); if (unlikely(!in_own_cluster_exact(net, addr))) return NULL; 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; }

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Allan Stephens4646.00%222.22%
Jon Paul Maloy2727.00%222.22%
Ying Xue2727.00%555.56%
Total100100.00%9100.00%


static void tipc_node_read_lock(struct tipc_node *n) { read_lock_bh(&n->lock); }

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Jon Paul Maloy19100.00%2100.00%
Total19100.00%2100.00%


static void tipc_node_read_unlock(struct tipc_node *n) { read_unlock_bh(&n->lock); }

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PersonTokensPropCommitsCommitProp
Jon Paul Maloy19100.00%2100.00%
Total19100.00%2100.00%


static void tipc_node_write_lock(struct tipc_node *n) { write_lock_bh(&n->lock); }

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Jon Paul Maloy19100.00%1100.00%
Total19100.00%1100.00%


static void tipc_node_write_unlock_fast(struct tipc_node *n) { write_unlock_bh(&n->lock); }

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Parthasarathy Bhuvaragan19100.00%1100.00%
Total19100.00%1100.00%


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, addr); } if (flags & TIPC_NOTIFY_LINK_DOWN) { tipc_mon_peer_down(net, addr, bearer_id); tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, link_id, addr); } }

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Jon Paul Maloy204100.00%2100.00%
Total204100.00%2100.00%


struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_node *n, *temp_node; int i; spin_lock_bh(&tn->node_list_lock); n = tipc_node_find(net, addr); if (n) { /* Same node may come back with new capabilities */ n->capabilities = capabilities; goto exit; } n = kzalloc(sizeof(*n), GFP_ATOMIC); if (!n) { pr_warn("Node creation failed, no memory\n"); goto exit; } n->addr = addr; 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->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), n->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); setup_timer(&n->timer, tipc_node_timeout, (unsigned long)n); 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); exit: spin_unlock_bh(&tn->node_list_lock); return n; }

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Jon Paul Maloy29668.36%1546.88%
Ying Xue4710.85%515.62%
Allan Stephens429.70%618.75%
Per Liden419.47%26.25%
Ingo Molnar30.69%13.12%
David S. Miller20.46%13.12%
Arnaldo Carvalho de Melo10.23%13.12%
Erik Hugne10.23%13.12%
Total433100.00%32100.00%


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); }

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Jon Paul Maloy72100.00%3100.00%
Total72100.00%3100.00%


static void tipc_node_delete(struct tipc_node *node) { list_del_rcu(&node->list); hlist_del_rcu(&node->hash); tipc_node_put(node); del_timer_sync(&node->timer); tipc_node_put(node); }

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PersonTokensPropCommitsCommitProp
Jon Paul Maloy1431.11%220.00%
Allan Stephens1226.67%220.00%
Per Liden1124.44%220.00%
Ying Xue715.56%330.00%
David S. Miller12.22%110.00%
Total45100.00%10100.00%


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); }

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Ying Xue5796.61%266.67%
Jon Paul Maloy23.39%133.33%
Total59100.00%3100.00%


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); }

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Jon Paul Maloy8198.78%266.67%
Parthasarathy Bhuvaragan11.22%133.33%
Total82100.00%3100.00%


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); }

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Jon Paul Maloy7698.70%266.67%
Parthasarathy Bhuvaragan11.30%133.33%
Total77100.00%3100.00%


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; }

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Jon Paul Maloy12280.26%240.00%
Ying Xue3019.74%360.00%
Total152100.00%5100.00%


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); }

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Jon Paul Maloy8986.41%240.00%
Ying Xue1413.59%360.00%
Total103100.00%5100.00%

/* tipc_node_timeout - handle expiration of node timer */
static void tipc_node_timeout(unsigned long data) { struct tipc_node *n = (struct tipc_node *)data; struct tipc_link_entry *le; struct sk_buff_head xmitq; int bearer_id; int rc = 0; __skb_queue_head_init(&xmitq); for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) { tipc_node_read_lock(n); le = &n->links[bearer_id]; spin_lock_bh(&le->lock); if (le->link) { /* Link tolerance may change asynchronously: */ tipc_node_calculate_timer(n, le->link); rc = tipc_link_timeout(le->link, &xmitq); } spin_unlock_bh(&le->lock); 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)); }

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Jon Paul Maloy175100.00%5100.00%
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/** * __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)); /* 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); }

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Jon Paul Maloy25577.51%1669.57%
Per Liden5215.81%14.35%
Ying Xue82.43%14.35%
Allan Stephens72.13%28.70%
Erik Hugne61.82%28.70%
David S. Miller10.30%14.35%
Total329100.00%23100.00%

/** * 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); }

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Jon Paul Maloy6189.71%675.00%
Per Liden68.82%112.50%
David S. Miller11.47%112.50%
Total68100.00%8100.00%

/** * __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 (!tipc_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); 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); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy40188.33%1161.11%
Per Liden367.93%211.11%
Ying Xue112.42%211.11%
Allan Stephens40.88%15.56%
Erik Hugne20.44%211.11%
Total454100.00%18100.00%


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_link *l = le->link; struct tipc_media_addr *maddr; struct sk_buff_head xmitq; int old_bearer_id = bearer_id; 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); if (delete) { kfree(l); le->link = NULL; n->link_cnt--; } } else { /* Defuse pending tipc_node_link_up() */ tipc_link_fsm_evt(l, LINK_RESET_EVT); } tipc_node_write_unlock(n); if (delete) tipc_mon_remove_peer(n->net, n->addr, old_bearer_id); tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); tipc_sk_rcv(n->net, &le->inputq); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy175100.00%6100.00%
Total175100.00%6100.00%


static bool tipc_node_is_up(struct tipc_node *n) { return n->active_links[0] != INVALID_BEARER_ID; }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden1361.90%120.00%
Jon Paul Maloy733.33%360.00%
David S. Miller14.76%120.00%
Total21100.00%5100.00%


void tipc_node_check_dest(struct net *net, u32 onode, 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; *dupl_addr = false; *respond = false; n = tipc_node_create(net, onode, 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) { pr_warn("Cannot establish 3rd link to %x\n", n->addr); goto exit; } if_name = strchr(b->name, ':') + 1; if (!tipc_link_create(net, if_name, b->identity, b->tolerance, b->net_plane, b->mtu, b->priority, b->window, mod(tipc_net(net)->random), tipc_own_addr(net), onode, n->capabilities, tipc_bc_sndlink(n->net), n->bc_entry.link, &le->inputq, &n->bc_entry.namedq, &l)) { *respond = false; goto exit; } 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); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy62199.68%1694.12%
Richard Alpe20.32%15.88%
Total623100.00%17100.00%


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(); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy55100.00%3100.00%
Total55100.00%3100.00%


static void tipc_node_reset_links(struct tipc_node *n) { char addr_string[16]; int i; pr_warn("Resetting all links to %s\n", tipc_addr_string_fill(addr_string, n->addr)); for (i = 0; i < MAX_BEARERS; i++) { tipc_node_link_down(n, i, false); } }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy58100.00%3100.00%
Total58100.00%3100.00%

/* 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; } n->state = state; return; illegal_evt: pr_err("Illegal node fsm evt %x in state %x\n", evt, state); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy461100.00%6100.00%
Total461100.00%6100.00%


static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq) { char addr_string[16]; 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 %s\n", tipc_addr_string_fill(addr_string, n->addr)); /* 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); } }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy15879.00%545.45%
Per Liden2412.00%19.09%
Allan Stephens157.50%218.18%
Erik Hugne10.50%19.09%
David S. Miller10.50%19.09%
Ying Xue10.50%19.09%
Total200100.00%11100.00%

/** * 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; } exit: tipc_node_read_unlock(node); tipc_node_put(node); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy4639.66%228.57%
Erik Hugne3933.62%114.29%
Ying Xue3126.72%457.14%
Total116100.00%7100.00%

/* 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(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 (tipc_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; }

Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe163100.00%3100.00%
Total163100.00%3100.00%

/** * 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_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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy17073.28%583.33%
Richard Alpe6226.72%116.67%
Total232100.00%6100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy54100.00%1100.00%
Total54100.00%1100.00%


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 (!tipc_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); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy110100.00%1100.00%
Total110100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy92100.00%1100.00%
Total92100.00%1100.00%


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_bearer_reset_all(n->net); 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); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy117100.00%1100.00%
Total117100.00%1100.00%

/** * 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); if (rc & TIPC_LINK_DOWN_EVT) { /* Reception reassembly failure => reset all links to peer */ if (!tipc_link_is_up(be->link)) tipc_node_reset_links(n); /* Retransmission failure => reset all links to all peers */ if (!tipc_link_is_up(tipc_bc_sndlink(net))) tipc_bearer_reset_all(net); } tipc_node_put(n); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy27099.63%685.71%
Fengguang Wu10.37%114.29%
Total271100.00%7100.00%

/** * 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 is ok, otherwise consumes buffer and returns 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 iseqno = msg_seqno(msg_get_wrapped(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; 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; } } /* 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_up(pl)) { __tipc_node_link_down(n, &pb_id, xmitq, &maddr); tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl), tipc_link_inputq(l)); } /* 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)) { syncpt = iseqno + exp_pkts - 1; if (!tipc_link_is_up(l)) { tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT); __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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy662100.00%12100.00%
Total662100.00%12100.00%

/** * 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 */ 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)) { 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); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy50694.05%1593.75%
Hamish Martin325.95%16.25%
Total538100.00%16100.00%


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; int i; /* We identify the peer by its net */ if (!info->attrs[TIPC_NLA_NET]) return -EINVAL; err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX, info->attrs[TIPC_NLA_NET], tipc_nl_net_policy); 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; } for (i = 0; i < MAX_BEARERS; i++) { struct tipc_link_entry *le = &peer->links[i]; if (le->link) { kfree(le->link); le->link = NULL; peer->link_cnt--; } } 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; }

Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe294100.00%1100.00%
Total294100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe20781.82%125.00%
Ying Xue4317.00%250.00%
Jon Paul Maloy31.19%125.00%
Total253100.00%4100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy147100.00%2100.00%
Total147100.00%2100.00%


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(attrs, TIPC_NLA_LINK_MAX, info->attrs[TIPC_NLA_LINK], tipc_nl_link_policy); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy33590.30%266.67%
Richard Alpe369.70%133.33%
Total371100.00%3100.00%


int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info) { struct net *net = genl_info_net(info); 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_NAME]) return -EINVAL; name = nla_data(info->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) { nlmsg_free(msg.skb); return err; } } else { int bearer_id; struct tipc_node *node; struct tipc_link *link; 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) { tipc_node_read_unlock(node); nlmsg_free(msg.skb); return -EINVAL; } err = __tipc_nl_add_link(net, &msg, link, 0); tipc_node_read_unlock(node); if (err) { nlmsg_free(msg.skb); return err; } } return genlmsg_reply(msg.skb, info); }

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PersonTokensPropCommitsCommitProp
Jon Paul Maloy260100.00%2100.00%
Total260100.00%2100.00%


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(attrs, TIPC_NLA_LINK_MAX, info->attrs[TIPC_NLA_LINK], tipc_nl_link_policy); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy254100.00%2100.00%
Total254100.00%2100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy100100.00%1100.00%
Total100100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy314100.00%2100.00%
Total314100.00%2100.00%


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(attrs, TIPC_NLA_MON_MAX, info->attrs[TIPC_NLA_MON], tipc_nl_monitor_policy); 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; }

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Parthasarathy Bhuvaragan120100.00%1100.00%
Total120100.00%1100.00%


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(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; }

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PersonTokensPropCommitsCommitProp
Parthasarathy Bhuvaragan150100.00%1100.00%
Total150100.00%1100.00%


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); 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); }

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Parthasarathy Bhuvaragan97100.00%1100.00%
Total97100.00%1100.00%


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 err; int i; 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 (i = prev_bearer; i < MAX_BEARERS; i++) { prev_bearer = i; err = __tipc_nl_add_monitor(net, &msg, prev_bearer); if (err) goto out; } out: rtnl_unlock(); cb->args[0] = prev_bearer; return skb->len; }

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PersonTokensPropCommitsCommitProp
Parthasarathy Bhuvaragan145100.00%1100.00%
Total145100.00%1100.00%


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(mon, TIPC_NLA_MON_MAX, attrs[TIPC_NLA_MON], tipc_nl_monitor_policy); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Parthasarathy Bhuvaragan271100.00%1100.00%
Total271100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy751576.18%6458.72%
Parthasarathy Bhuvaragan8048.15%43.67%
Richard Alpe7697.80%98.26%
Ying Xue3513.56%109.17%
Per Liden2042.07%21.83%
Allan Stephens1271.29%1110.09%
Erik Hugne500.51%43.67%
Hamish Martin320.32%10.92%
David S. Miller80.08%10.92%
Ingo Molnar30.03%10.92%
Fengguang Wu10.01%10.92%
Arnaldo Carvalho de Melo10.01%10.92%
Total9865100.00%109100.00%
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