cregit-Linux how code gets into the kernel

Release 4.14 net/tipc/name_distr.c

Directory: net/tipc
/*
 * net/tipc/name_distr.c: TIPC name distribution code
 *
 * Copyright (c) 2000-2006, 2014, Ericsson AB
 * Copyright (c) 2005, 2010-2011, 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 "name_distr.h"


int sysctl_tipc_named_timeout __read_mostly = 2000;


struct distr_queue_item {
	
struct distr_item i;
	
u32 dtype;
	
u32 node;
	
unsigned long expires;
	
struct list_head next;
};

/**
 * publ_to_item - add publication info to a publication message
 */

static void publ_to_item(struct distr_item *i, struct publication *p) { i->type = htonl(p->type); i->lower = htonl(p->lower); i->upper = htonl(p->upper); i->ref = htonl(p->ref); i->key = htonl(p->key); }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden71100.00%1100.00%
Total71100.00%1100.00%

/** * named_prepare_buf - allocate & initialize a publication message * * The buffer returned is of size INT_H_SIZE + payload size */
static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size, u32 dest) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC); struct tipc_msg *msg; if (buf != NULL) { msg = buf_msg(buf); tipc_msg_init(tn->own_addr, msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest); msg_set_size(msg, INT_H_SIZE + size); } return buf; }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden6971.13%114.29%
Jon Paul Maloy1515.46%114.29%
Ying Xue66.19%114.29%
Allan Stephens44.12%228.57%
Parthasarathy Bhuvaragan22.06%114.29%
Stephen Hemminger11.03%114.29%
Total97100.00%7100.00%

/** * tipc_named_publish - tell other nodes about a new publication by this node */
struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct sk_buff *buf; struct distr_item *item; list_add_tail_rcu(&publ->local_list, &tn->nametbl->publ_list[publ->scope]); if (publ->scope == TIPC_NODE_SCOPE) return NULL; buf = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); if (!buf) { pr_warn("Publication distribution failure\n"); return NULL; } item = (struct distr_item *)msg_data(buf_msg(buf)); publ_to_item(item, publ); return buf; }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden7258.54%218.18%
Ying Xue3629.27%545.45%
Allan Stephens1411.38%327.27%
Erik Hugne10.81%19.09%
Total123100.00%11100.00%

/** * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node */
struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) { struct sk_buff *buf; struct distr_item *item; list_del(&publ->local_list); if (publ->scope == TIPC_NODE_SCOPE) return NULL; buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); if (!buf) { pr_warn("Withdrawal distribution failure\n"); return NULL; } item = (struct distr_item *)msg_data(buf_msg(buf)); publ_to_item(item, publ); return buf; }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden7171.72%228.57%
Ying Xue1818.18%228.57%
Allan Stephens88.08%114.29%
Erik Hugne11.01%114.29%
Lucas De Marchi11.01%114.29%
Total99100.00%7100.00%

/** * named_distribute - prepare name info for bulk distribution to another node * @list: list of messages (buffers) to be returned from this function * @dnode: node to be updated * @pls: linked list of publication items to be packed into buffer chain */
static void named_distribute(struct net *net, struct sk_buff_head *list, u32 dnode, struct list_head *pls) { struct publication *publ; struct sk_buff *skb = NULL; struct distr_item *item = NULL; u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0) - INT_H_SIZE) / ITEM_SIZE) * ITEM_SIZE; u32 msg_rem = msg_dsz; list_for_each_entry(publ, pls, local_list) { /* Prepare next buffer: */ if (!skb) { skb = named_prepare_buf(net, PUBLICATION, msg_rem, dnode); if (!skb) { pr_warn("Bulk publication failure\n"); return; } msg_set_bc_ack_invalid(buf_msg(skb), true); item = (struct distr_item *)msg_data(buf_msg(skb)); } /* Pack publication into message: */ publ_to_item(item, publ); item++; msg_rem -= ITEM_SIZE; /* Append full buffer to list: */ if (!msg_rem) { __skb_queue_tail(list, skb); skb = NULL; msg_rem = msg_dsz; } } if (skb) { msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem)); skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); __skb_queue_tail(list, skb); } }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden8237.44%16.25%
Ying Xue6931.51%531.25%
Jon Paul Maloy3616.44%212.50%
Allan Stephens219.59%425.00%
Parthasarathy Bhuvaragan62.74%16.25%
Paul Gortmaker20.91%16.25%
Sam Ravnborg20.91%16.25%
Erik Hugne10.46%16.25%
Total219100.00%16100.00%

/** * tipc_named_node_up - tell specified node about all publications by this node */
void tipc_named_node_up(struct net *net, u32 dnode) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct sk_buff_head head; __skb_queue_head_init(&head); rcu_read_lock(); named_distribute(net, &head, dnode, &tn->nametbl->publ_list[TIPC_CLUSTER_SCOPE]); named_distribute(net, &head, dnode, &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]); rcu_read_unlock(); tipc_node_xmit(net, &head, dnode, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue5559.14%646.15%
Allan Stephens2931.18%323.08%
Jon Paul Maloy77.53%323.08%
Per Liden22.15%17.69%
Total93100.00%13100.00%

/** * tipc_publ_purge - remove publication associated with a failed node * * Invoked for each publication issued by a newly failed node. * Removes publication structure from name table & deletes it. */
static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct publication *p; spin_lock_bh(&tn->nametbl_lock); p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->node, publ->ref, publ->key); if (p) tipc_node_unsubscribe(net, &p->nodesub_list, addr); spin_unlock_bh(&tn->nametbl_lock); if (p != publ) { pr_err("Unable to remove publication from failed node\n" " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", publ->type, publ->lower, publ->node, publ->ref, publ->key); } kfree_rcu(p, rcu); }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden5238.24%220.00%
Allan Stephens4029.41%220.00%
Ying Xue3827.94%440.00%
Jon Paul Maloy42.94%110.00%
Erik Hugne21.47%110.00%
Total136100.00%10100.00%

/** * tipc_dist_queue_purge - remove deferred updates from a node that went down */
static void tipc_dist_queue_purge(struct net *net, u32 addr) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct distr_queue_item *e, *tmp; spin_lock_bh(&tn->nametbl_lock); list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) { if (e->node != addr) continue; list_del(&e->next); kfree(e); } spin_unlock_bh(&tn->nametbl_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Erik Hugne84100.00%1100.00%
Total84100.00%1100.00%


void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr) { struct publication *publ, *tmp; list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list) tipc_publ_purge(net, publ, addr); tipc_dist_queue_purge(net, addr); }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue4586.54%266.67%
Erik Hugne713.46%133.33%
Total52100.00%3100.00%

/** * tipc_update_nametbl - try to process a nametable update and notify * subscribers * * tipc_nametbl_lock must be held. * Returns the publication item if successful, otherwise NULL. */
static bool tipc_update_nametbl(struct net *net, struct distr_item *i, u32 node, u32 dtype) { struct publication *publ = NULL; if (dtype == PUBLICATION) { publ = tipc_nametbl_insert_publ(net, ntohl(i->type), ntohl(i->lower), ntohl(i->upper), TIPC_CLUSTER_SCOPE, node, ntohl(i->ref), ntohl(i->key)); if (publ) { tipc_node_subscribe(net, &publ->nodesub_list, node); return true; } } else if (dtype == WITHDRAWAL) { publ = tipc_nametbl_remove_publ(net, ntohl(i->type), ntohl(i->lower), node, ntohl(i->ref), ntohl(i->key)); if (publ) { tipc_node_unsubscribe(net, &publ->nodesub_list, node); kfree_rcu(publ, rcu); return true; } } else { pr_warn("Unrecognized name table message received\n"); } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden11862.43%220.00%
Erik Hugne4222.22%220.00%
Ying Xue189.52%440.00%
Jon Paul Maloy84.23%110.00%
Allan Stephens31.59%110.00%
Total189100.00%10100.00%

/** * tipc_named_add_backlog - add a failed name table update to the backlog * */
static void tipc_named_add_backlog(struct net *net, struct distr_item *i, u32 type, u32 node) { struct distr_queue_item *e; struct tipc_net *tn = net_generic(net, tipc_net_id); unsigned long now = get_jiffies_64(); e = kzalloc(sizeof(*e), GFP_ATOMIC); if (!e) return; e->dtype = type; e->node = node; e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout); memcpy(e, i, sizeof(*i)); list_add_tail(&e->next, &tn->dist_queue); }

Contributors

PersonTokensPropCommitsCommitProp
Erik Hugne114100.00%2100.00%
Total114100.00%2100.00%

/** * tipc_named_process_backlog - try to process any pending name table updates * from the network. */
void tipc_named_process_backlog(struct net *net) { struct distr_queue_item *e, *tmp; struct tipc_net *tn = net_generic(net, tipc_net_id); char addr[16]; unsigned long now = get_jiffies_64(); list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) { if (time_after(e->expires, now)) { if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype)) continue; } else { tipc_addr_string_fill(addr, e->node); pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n", e->dtype, ntohl(e->i.type), ntohl(e->i.lower), ntohl(e->i.upper), addr, ntohl(e->i.key)); } list_del(&e->next); kfree(e); } }

Contributors

PersonTokensPropCommitsCommitProp
Erik Hugne15696.30%266.67%
Ying Xue63.70%133.33%
Total162100.00%3100.00%

/** * tipc_named_rcv - process name table update messages sent by another node */
void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_msg *msg; struct distr_item *item; uint count; u32 node; struct sk_buff *skb; int mtype; spin_lock_bh(&tn->nametbl_lock); for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) { skb_linearize(skb); msg = buf_msg(skb); mtype = msg_type(msg); item = (struct distr_item *)msg_data(msg); count = msg_data_sz(msg) / ITEM_SIZE; node = msg_orignode(msg); while (count--) { if (!tipc_update_nametbl(net, item, node, mtype)) tipc_named_add_backlog(net, item, mtype, node); item++; } kfree_skb(skb); tipc_named_process_backlog(net); } spin_unlock_bh(&tn->nametbl_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jon Paul Maloy7743.02%220.00%
Erik Hugne5731.84%330.00%
Ying Xue2614.53%330.00%
Per Liden116.15%110.00%
Allan Stephens84.47%110.00%
Total179100.00%10100.00%

/** * tipc_named_reinit - re-initialize local publications * * This routine is called whenever TIPC networking is enabled. * All name table entries published by this node are updated to reflect * the node's new network address. */
void tipc_named_reinit(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct publication *publ; int scope; spin_lock_bh(&tn->nametbl_lock); for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++) list_for_each_entry_rcu(publ, &tn->nametbl->publ_list[scope], local_list) publ->node = tn->own_addr; spin_unlock_bh(&tn->nametbl_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden3040.00%228.57%
Ying Xue2938.67%342.86%
Allan Stephens1621.33%228.57%
Total75100.00%7100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Per Liden59033.81%24.76%
Erik Hugne49928.60%614.29%
Ying Xue34819.94%1023.81%
Jon Paul Maloy1488.48%819.05%
Allan Stephens1458.31%1023.81%
Parthasarathy Bhuvaragan90.52%24.76%
Sam Ravnborg20.11%12.38%
Paul Gortmaker20.11%12.38%
Stephen Hemminger10.06%12.38%
Lucas De Marchi10.06%12.38%
Total1745100.00%42100.00%
Directory: net/tipc
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