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336 lines
10 KiB
336 lines
10 KiB
/*
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* net/tipc/discover.c
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*
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* Copyright (c) 2003-2006, 2014-2015, Ericsson AB
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* Copyright (c) 2005-2006, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "node.h"
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#include "discover.h"
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/* min delay during bearer start up */
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#define TIPC_LINK_REQ_INIT msecs_to_jiffies(125)
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/* max delay if bearer has no links */
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#define TIPC_LINK_REQ_FAST msecs_to_jiffies(1000)
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/* max delay if bearer has links */
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#define TIPC_LINK_REQ_SLOW msecs_to_jiffies(60000)
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/* indicates no timer in use */
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#define TIPC_LINK_REQ_INACTIVE 0xffffffff
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/**
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* struct tipc_link_req - information about an ongoing link setup request
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* @bearer_id: identity of bearer issuing requests
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* @net: network namespace instance
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* @dest: destination address for request messages
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* @domain: network domain to which links can be established
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* @num_nodes: number of nodes currently discovered (i.e. with an active link)
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* @lock: spinlock for controlling access to requests
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* @buf: request message to be (repeatedly) sent
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* @timer: timer governing period between requests
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* @timer_intv: current interval between requests (in ms)
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*/
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struct tipc_link_req {
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u32 bearer_id;
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struct tipc_media_addr dest;
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struct net *net;
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u32 domain;
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int num_nodes;
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spinlock_t lock;
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struct sk_buff *buf;
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struct timer_list timer;
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unsigned long timer_intv;
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};
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/**
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* tipc_disc_init_msg - initialize a link setup message
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* @net: the applicable net namespace
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* @type: message type (request or response)
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* @b: ptr to bearer issuing message
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*/
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static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type,
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struct tipc_bearer *b)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_msg *msg;
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u32 dest_domain = b->domain;
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msg = buf_msg(buf);
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tipc_msg_init(tn->own_addr, msg, LINK_CONFIG, type,
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MAX_H_SIZE, dest_domain);
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msg_set_non_seq(msg, 1);
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msg_set_node_sig(msg, tn->random);
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msg_set_node_capabilities(msg, TIPC_NODE_CAPABILITIES);
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msg_set_dest_domain(msg, dest_domain);
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msg_set_bc_netid(msg, tn->net_id);
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b->media->addr2msg(msg_media_addr(msg), &b->addr);
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}
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/**
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* disc_dupl_alert - issue node address duplication alert
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* @b: pointer to bearer detecting duplication
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* @node_addr: duplicated node address
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* @media_addr: media address advertised by duplicated node
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*/
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static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr,
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struct tipc_media_addr *media_addr)
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{
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char node_addr_str[16];
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char media_addr_str[64];
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tipc_addr_string_fill(node_addr_str, node_addr);
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tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str),
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media_addr);
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pr_warn("Duplicate %s using %s seen on <%s>\n", node_addr_str,
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media_addr_str, b->name);
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}
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/**
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* tipc_disc_rcv - handle incoming discovery message (request or response)
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* @net: the applicable net namespace
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* @buf: buffer containing message
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* @bearer: bearer that message arrived on
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*/
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void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
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struct tipc_bearer *bearer)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_media_addr maddr;
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struct sk_buff *rskb;
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struct tipc_msg *hdr = buf_msg(skb);
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u32 ddom = msg_dest_domain(hdr);
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u32 onode = msg_prevnode(hdr);
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u32 net_id = msg_bc_netid(hdr);
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u32 mtyp = msg_type(hdr);
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u32 signature = msg_node_sig(hdr);
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u16 caps = msg_node_capabilities(hdr);
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bool respond = false;
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bool dupl_addr = false;
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int err;
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err = bearer->media->msg2addr(bearer, &maddr, msg_media_addr(hdr));
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kfree_skb(skb);
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if (err)
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return;
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/* Ensure message from node is valid and communication is permitted */
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if (net_id != tn->net_id)
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return;
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if (maddr.broadcast)
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return;
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if (!tipc_addr_domain_valid(ddom))
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return;
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if (!tipc_addr_node_valid(onode))
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return;
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if (in_own_node(net, onode)) {
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if (memcmp(&maddr, &bearer->addr, sizeof(maddr)))
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disc_dupl_alert(bearer, tn->own_addr, &maddr);
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return;
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}
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if (!tipc_in_scope(ddom, tn->own_addr))
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return;
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if (!tipc_in_scope(bearer->domain, onode))
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return;
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tipc_node_check_dest(net, onode, bearer, caps, signature,
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&maddr, &respond, &dupl_addr);
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if (dupl_addr)
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disc_dupl_alert(bearer, onode, &maddr);
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/* Send response, if necessary */
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if (respond && (mtyp == DSC_REQ_MSG)) {
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rskb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
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if (!rskb)
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return;
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tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer);
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tipc_bearer_xmit_skb(net, bearer->identity, rskb, &maddr);
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}
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}
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/**
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* disc_update - update frequency of periodic link setup requests
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* @req: ptr to link request structure
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*
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* Reinitiates discovery process if discovery object has no associated nodes
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* and is either not currently searching or is searching at a slow rate
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*/
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static void disc_update(struct tipc_link_req *req)
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{
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if (!req->num_nodes) {
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if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) ||
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(req->timer_intv > TIPC_LINK_REQ_FAST)) {
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req->timer_intv = TIPC_LINK_REQ_INIT;
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mod_timer(&req->timer, jiffies + req->timer_intv);
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}
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}
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}
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/**
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* tipc_disc_add_dest - increment set of discovered nodes
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* @req: ptr to link request structure
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*/
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void tipc_disc_add_dest(struct tipc_link_req *req)
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{
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spin_lock_bh(&req->lock);
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req->num_nodes++;
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spin_unlock_bh(&req->lock);
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}
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/**
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* tipc_disc_remove_dest - decrement set of discovered nodes
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* @req: ptr to link request structure
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*/
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void tipc_disc_remove_dest(struct tipc_link_req *req)
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{
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spin_lock_bh(&req->lock);
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req->num_nodes--;
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disc_update(req);
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spin_unlock_bh(&req->lock);
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}
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/**
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* disc_timeout - send a periodic link setup request
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* @data: ptr to link request structure
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*
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* Called whenever a link setup request timer associated with a bearer expires.
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*/
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static void disc_timeout(unsigned long data)
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{
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struct tipc_link_req *req = (struct tipc_link_req *)data;
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struct sk_buff *skb;
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int max_delay;
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spin_lock_bh(&req->lock);
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/* Stop searching if only desired node has been found */
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if (tipc_node(req->domain) && req->num_nodes) {
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req->timer_intv = TIPC_LINK_REQ_INACTIVE;
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goto exit;
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}
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/*
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* Send discovery message, then update discovery timer
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*
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* Keep doubling time between requests until limit is reached;
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* hold at fast polling rate if don't have any associated nodes,
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* otherwise hold at slow polling rate
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*/
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skb = skb_clone(req->buf, GFP_ATOMIC);
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if (skb)
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tipc_bearer_xmit_skb(req->net, req->bearer_id, skb, &req->dest);
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req->timer_intv *= 2;
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if (req->num_nodes)
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max_delay = TIPC_LINK_REQ_SLOW;
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else
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max_delay = TIPC_LINK_REQ_FAST;
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if (req->timer_intv > max_delay)
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req->timer_intv = max_delay;
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mod_timer(&req->timer, jiffies + req->timer_intv);
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exit:
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spin_unlock_bh(&req->lock);
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}
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/**
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* tipc_disc_create - create object to send periodic link setup requests
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* @net: the applicable net namespace
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* @b: ptr to bearer issuing requests
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* @dest: destination address for request messages
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* @dest_domain: network domain to which links can be established
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*
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* Returns 0 if successful, otherwise -errno.
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*/
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int tipc_disc_create(struct net *net, struct tipc_bearer *b,
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struct tipc_media_addr *dest, struct sk_buff **skb)
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{
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struct tipc_link_req *req;
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req = kmalloc(sizeof(*req), GFP_ATOMIC);
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if (!req)
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return -ENOMEM;
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req->buf = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
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if (!req->buf) {
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kfree(req);
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return -ENOMEM;
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}
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tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b);
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memcpy(&req->dest, dest, sizeof(*dest));
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req->net = net;
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req->bearer_id = b->identity;
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req->domain = b->domain;
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req->num_nodes = 0;
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req->timer_intv = TIPC_LINK_REQ_INIT;
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spin_lock_init(&req->lock);
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setup_timer(&req->timer, disc_timeout, (unsigned long)req);
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mod_timer(&req->timer, jiffies + req->timer_intv);
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b->link_req = req;
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*skb = skb_clone(req->buf, GFP_ATOMIC);
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return 0;
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}
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/**
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* tipc_disc_delete - destroy object sending periodic link setup requests
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* @req: ptr to link request structure
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*/
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void tipc_disc_delete(struct tipc_link_req *req)
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{
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del_timer_sync(&req->timer);
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kfree_skb(req->buf);
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kfree(req);
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}
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/**
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* tipc_disc_reset - reset object to send periodic link setup requests
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* @net: the applicable net namespace
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* @b: ptr to bearer issuing requests
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* @dest_domain: network domain to which links can be established
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*/
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void tipc_disc_reset(struct net *net, struct tipc_bearer *b)
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{
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struct tipc_link_req *req = b->link_req;
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struct sk_buff *skb;
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spin_lock_bh(&req->lock);
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tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b);
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req->net = net;
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req->bearer_id = b->identity;
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req->domain = b->domain;
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req->num_nodes = 0;
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req->timer_intv = TIPC_LINK_REQ_INIT;
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mod_timer(&req->timer, jiffies + req->timer_intv);
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skb = skb_clone(req->buf, GFP_ATOMIC);
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if (skb)
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tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest);
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spin_unlock_bh(&req->lock);
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}
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