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Release 4.14 net/tipc/discover.c

Directory: net/tipc
/*
 * net/tipc/discover.c
 *
 * Copyright (c) 2003-2006, 2014-2015, Ericsson AB
 * Copyright (c) 2005-2006, 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 "node.h"
#include "discover.h"

/* min delay during bearer start up */

#define TIPC_LINK_REQ_INIT	msecs_to_jiffies(125)
/* max delay if bearer has no links */

#define TIPC_LINK_REQ_FAST	msecs_to_jiffies(1000)
/* max delay if bearer has links */

#define TIPC_LINK_REQ_SLOW	msecs_to_jiffies(60000)
/* indicates no timer in use */

#define TIPC_LINK_REQ_INACTIVE	0xffffffff

/**
 * struct tipc_link_req - information about an ongoing link setup request
 * @bearer_id: identity of bearer issuing requests
 * @net: network namespace instance
 * @dest: destination address for request messages
 * @domain: network domain to which links can be established
 * @num_nodes: number of nodes currently discovered (i.e. with an active link)
 * @lock: spinlock for controlling access to requests
 * @buf: request message to be (repeatedly) sent
 * @timer: timer governing period between requests
 * @timer_intv: current interval between requests (in ms)
 */

struct tipc_link_req {
	
u32 bearer_id;
	
struct tipc_media_addr dest;
	
struct net *net;
	
u32 domain;
	
int num_nodes;
	
spinlock_t lock;
	
struct sk_buff *buf;
	
struct timer_list timer;
	
unsigned long timer_intv;
};

/**
 * tipc_disc_init_msg - initialize a link setup message
 * @net: the applicable net namespace
 * @type: message type (request or response)
 * @b: ptr to bearer issuing message
 */

static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type, struct tipc_bearer *b) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_msg *msg; u32 dest_domain = b->domain; msg = buf_msg(buf); tipc_msg_init(tn->own_addr, msg, LINK_CONFIG, type, MAX_H_SIZE, dest_domain); msg_set_non_seq(msg, 1); msg_set_node_sig(msg, tn->random); msg_set_node_capabilities(msg, TIPC_NODE_CAPABILITIES); msg_set_dest_domain(msg, dest_domain); msg_set_bc_netid(msg, tn->net_id); b->media->addr2msg(msg_media_addr(msg), &b->addr); }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden5542.97%15.56%
Ying Xue2922.66%422.22%
Allan Stephens1814.06%527.78%
Jon Paul Maloy1814.06%527.78%
Erik Hugne75.47%211.11%
Adrian Bunk10.78%15.56%
Total128100.00%18100.00%

/** * disc_dupl_alert - issue node address duplication alert * @b: pointer to bearer detecting duplication * @node_addr: duplicated node address * @media_addr: media address advertised by duplicated node */
static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr, struct tipc_media_addr *media_addr) { char node_addr_str[16]; char media_addr_str[64]; tipc_addr_string_fill(node_addr_str, node_addr); tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str), media_addr); pr_warn("Duplicate %s using %s seen on <%s>\n", node_addr_str, media_addr_str, b->name); }

Contributors

PersonTokensPropCommitsCommitProp
Allan Stephens5993.65%350.00%
Erik Hugne23.17%233.33%
Jon Paul Maloy23.17%116.67%
Total63100.00%6100.00%

/** * tipc_disc_rcv - handle incoming discovery message (request or response) * @net: the applicable net namespace * @buf: buffer containing message * @bearer: bearer that message arrived on */
void tipc_disc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *bearer) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_media_addr maddr; struct sk_buff *rskb; struct tipc_msg *hdr = buf_msg(skb); u32 ddom = msg_dest_domain(hdr); u32 onode = msg_prevnode(hdr); u32 net_id = msg_bc_netid(hdr); u32 mtyp = msg_type(hdr); u32 signature = msg_node_sig(hdr); u16 caps = msg_node_capabilities(hdr); bool respond = false; bool dupl_addr = false; int err; err = bearer->media->msg2addr(bearer, &maddr, msg_media_addr(hdr)); kfree_skb(skb); if (err) return; /* Ensure message from node is valid and communication is permitted */ if (net_id != tn->net_id) return; if (maddr.broadcast) return; if (!tipc_addr_domain_valid(ddom)) return; if (!tipc_addr_node_valid(onode)) return; if (in_own_node(net, onode)) { if (memcmp(&maddr, &bearer->addr, sizeof(maddr))) disc_dupl_alert(bearer, tn->own_addr, &maddr); return; } if (!tipc_in_scope(ddom, tn->own_addr)) return; if (!tipc_in_scope(bearer->domain, onode)) return; tipc_node_check_dest(net, onode, bearer, caps, signature, &maddr, &respond, &dupl_addr); if (dupl_addr) disc_dupl_alert(bearer, onode, &maddr); /* Send response, if necessary */ if (respond && (mtyp == DSC_REQ_MSG)) { rskb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC); if (!rskb) return; tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer); tipc_bearer_xmit_skb(net, bearer->identity, rskb, &maddr); } }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden11133.33%26.45%
Jon Paul Maloy8625.83%516.13%
Allan Stephens7622.82%1238.71%
Ying Xue4613.81%825.81%
Richard Alpe103.00%13.23%
Parthasarathy Bhuvaragan20.60%13.23%
Erik Hugne10.30%13.23%
Patrick McHardy10.30%13.23%
Total333100.00%31100.00%

/** * disc_update - update frequency of periodic link setup requests * @req: ptr to link request structure * * Reinitiates discovery process if discovery object has no associated nodes * and is either not currently searching or is searching at a slow rate */
static void disc_update(struct tipc_link_req *req) { if (!req->num_nodes) { if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) || (req->timer_intv > TIPC_LINK_REQ_FAST)) { req->timer_intv = TIPC_LINK_REQ_INIT; mod_timer(&req->timer, jiffies + req->timer_intv); } } }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden4371.67%120.00%
Allan Stephens1321.67%240.00%
Ying Xue35.00%120.00%
Paul Gortmaker11.67%120.00%
Total60100.00%5100.00%

/** * tipc_disc_add_dest - increment set of discovered nodes * @req: ptr to link request structure */
void tipc_disc_add_dest(struct tipc_link_req *req) { spin_lock_bh(&req->lock); req->num_nodes++; spin_unlock_bh(&req->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue1651.61%133.33%
Allan Stephens1445.16%133.33%
Paul Gortmaker13.23%133.33%
Total31100.00%3100.00%

/** * tipc_disc_remove_dest - decrement set of discovered nodes * @req: ptr to link request structure */
void tipc_disc_remove_dest(struct tipc_link_req *req) { spin_lock_bh(&req->lock); req->num_nodes--; disc_update(req); spin_unlock_bh(&req->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Allan Stephens1952.78%133.33%
Ying Xue1644.44%133.33%
Paul Gortmaker12.78%133.33%
Total36100.00%3100.00%

/** * disc_timeout - send a periodic link setup request * @data: ptr to link request structure * * Called whenever a link setup request timer associated with a bearer expires. */
static void disc_timeout(unsigned long data) { struct tipc_link_req *req = (struct tipc_link_req *)data; struct sk_buff *skb; int max_delay; spin_lock_bh(&req->lock); /* Stop searching if only desired node has been found */ if (tipc_node(req->domain) && req->num_nodes) { req->timer_intv = TIPC_LINK_REQ_INACTIVE; goto exit; } /* * Send discovery message, then update discovery timer * * Keep doubling time between requests until limit is reached; * hold at fast polling rate if don't have any associated nodes, * otherwise hold at slow polling rate */ skb = skb_clone(req->buf, GFP_ATOMIC); if (skb) tipc_bearer_xmit_skb(req->net, req->bearer_id, skb, &req->dest); req->timer_intv *= 2; if (req->num_nodes) max_delay = TIPC_LINK_REQ_SLOW; else max_delay = TIPC_LINK_REQ_FAST; if (req->timer_intv > max_delay) req->timer_intv = max_delay; mod_timer(&req->timer, jiffies + req->timer_intv); exit: spin_unlock_bh(&req->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden5635.90%111.11%
Allan Stephens4931.41%333.33%
Jon Paul Maloy2214.10%111.11%
Ying Xue1912.18%222.22%
Erik Hugne95.77%111.11%
Paul Gortmaker10.64%111.11%
Total156100.00%9100.00%

/** * tipc_disc_create - create object to send periodic link setup requests * @net: the applicable net namespace * @b: ptr to bearer issuing requests * @dest: destination address for request messages * @dest_domain: network domain to which links can be established * * Returns 0 if successful, otherwise -errno. */
int tipc_disc_create(struct net *net, struct tipc_bearer *b, struct tipc_media_addr *dest, struct sk_buff **skb) { struct tipc_link_req *req; req = kmalloc(sizeof(*req), GFP_ATOMIC); if (!req) return -ENOMEM; req->buf = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC); if (!req->buf) { kfree(req); return -ENOMEM; } tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b); memcpy(&req->dest, dest, sizeof(*dest)); req->net = net; req->bearer_id = b->identity; req->domain = b->domain; req->num_nodes = 0; req->timer_intv = TIPC_LINK_REQ_INIT; spin_lock_init(&req->lock); setup_timer(&req->timer, disc_timeout, (unsigned long)req); mod_timer(&req->timer, jiffies + req->timer_intv); b->link_req = req; *skb = skb_clone(req->buf, GFP_ATOMIC); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Per Liden10752.45%15.88%
Ying Xue5325.98%741.18%
Jon Paul Maloy2311.27%317.65%
Allan Stephens178.33%317.65%
Parthasarathy Bhuvaragan20.98%15.88%
Paul Gortmaker10.49%15.88%
Erik Hugne10.49%15.88%
Total204100.00%17100.00%

/** * tipc_disc_delete - destroy object sending periodic link setup requests * @req: ptr to link request structure */
void tipc_disc_delete(struct tipc_link_req *req) { del_timer_sync(&req->timer); kfree_skb(req->buf); kfree(req); }

Contributors

PersonTokensPropCommitsCommitProp
Allan Stephens2893.33%250.00%
Paul Gortmaker13.33%125.00%
Ying Xue13.33%125.00%
Total30100.00%4100.00%

/** * tipc_disc_reset - reset object to send periodic link setup requests * @net: the applicable net namespace * @b: ptr to bearer issuing requests * @dest_domain: network domain to which links can be established */
void tipc_disc_reset(struct net *net, struct tipc_bearer *b) { struct tipc_link_req *req = b->link_req; struct sk_buff *skb; spin_lock_bh(&req->lock); tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b); req->net = net; req->bearer_id = b->identity; req->domain = b->domain; req->num_nodes = 0; req->timer_intv = TIPC_LINK_REQ_INIT; mod_timer(&req->timer, jiffies + req->timer_intv); skb = skb_clone(req->buf, GFP_ATOMIC); if (skb) tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest); spin_unlock_bh(&req->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue11080.29%466.67%
Jon Paul Maloy2719.71%233.33%
Total137100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Per Liden41032.59%23.77%
Ying Xue31725.20%1222.64%
Allan Stephens30424.17%1833.96%
Jon Paul Maloy18414.63%1120.75%
Erik Hugne201.59%59.43%
Richard Alpe100.79%11.89%
Paul Gortmaker70.56%11.89%
Parthasarathy Bhuvaragan40.32%11.89%
Patrick McHardy10.08%11.89%
Adrian Bunk10.08%11.89%
Total1258100.00%53100.00%
Directory: net/tipc
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