316 lines
8.8 KiB
C
316 lines
8.8 KiB
C
/*
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* net/tipc/discover.c
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*
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* Copyright (c) 2003-2006, Ericsson AB
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* Copyright (c) 2005-2006, 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 "dbg.h"
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#include "link.h"
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#include "zone.h"
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#include "discover.h"
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#include "port.h"
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#include "name_table.h"
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#define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */
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#define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */
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#define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */
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#if 0
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#define GET_NODE_INFO 300
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#define GET_NODE_INFO_RESULT 301
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#define FORWARD_LINK_PROBE 302
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#define LINK_REQUEST_REJECTED 303
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#define LINK_REQUEST_ACCEPTED 304
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#define DROP_LINK_REQUEST 305
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#define CHECK_LINK_COUNT 306
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#endif
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/*
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* TODO: Most of the inter-cluster setup stuff should be
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* rewritten, and be made conformant with specification.
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*/
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/**
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* struct link_req - information about an ongoing link setup request
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* @bearer: bearer issuing requests
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* @dest: destination address for request messages
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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 link_req {
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struct bearer *bearer;
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struct tipc_media_addr dest;
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struct sk_buff *buf;
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struct timer_list timer;
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unsigned int timer_intv;
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};
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#if 0
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int disc_create_link(const struct tipc_link_create *argv)
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{
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/*
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* Code for inter cluster link setup here
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*/
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return TIPC_OK;
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}
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#endif
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/*
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* disc_lost_link(): A link has lost contact
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*/
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void tipc_disc_link_event(u32 addr, char *name, int up)
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{
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if (in_own_cluster(addr))
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return;
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/*
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* Code for inter cluster link setup here
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*/
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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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* @type: message type (request or response)
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* @req_links: number of links associated with message
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* @dest_domain: network domain of node(s) which should respond to message
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* @b_ptr: ptr to bearer issuing message
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*/
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static struct sk_buff *tipc_disc_init_msg(u32 type,
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u32 req_links,
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u32 dest_domain,
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struct bearer *b_ptr)
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{
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struct sk_buff *buf = buf_acquire(DSC_H_SIZE);
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struct tipc_msg *msg;
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if (buf) {
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msg = buf_msg(buf);
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msg_init(msg, LINK_CONFIG, type, TIPC_OK, DSC_H_SIZE,
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dest_domain);
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msg_set_non_seq(msg);
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msg_set_req_links(msg, req_links);
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msg_set_dest_domain(msg, dest_domain);
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msg_set_bc_netid(msg, tipc_net_id);
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msg_set_media_addr(msg, &b_ptr->publ.addr);
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}
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return buf;
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}
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/**
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* tipc_disc_recv_msg - handle incoming link setup message (request or response)
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* @buf: buffer containing message
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*/
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void tipc_disc_recv_msg(struct sk_buff *buf)
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{
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struct bearer *b_ptr = (struct bearer *)TIPC_SKB_CB(buf)->handle;
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struct link *link;
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struct tipc_media_addr media_addr;
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struct tipc_msg *msg = buf_msg(buf);
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u32 dest = msg_dest_domain(msg);
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u32 orig = msg_prevnode(msg);
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u32 net_id = msg_bc_netid(msg);
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u32 type = msg_type(msg);
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msg_get_media_addr(msg,&media_addr);
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msg_dbg(msg, "RECV:");
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buf_discard(buf);
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if (net_id != tipc_net_id)
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return;
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if (!tipc_addr_domain_valid(dest))
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return;
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if (!tipc_addr_node_valid(orig))
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return;
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if (orig == tipc_own_addr)
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return;
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if (!in_scope(dest, tipc_own_addr))
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return;
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if (is_slave(tipc_own_addr) && is_slave(orig))
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return;
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if (is_slave(orig) && !in_own_cluster(orig))
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return;
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if (in_own_cluster(orig)) {
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/* Always accept link here */
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struct sk_buff *rbuf;
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struct tipc_media_addr *addr;
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struct node *n_ptr = tipc_node_find(orig);
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int link_up;
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dbg(" in own cluster\n");
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if (n_ptr == NULL) {
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n_ptr = tipc_node_create(orig);
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}
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if (n_ptr == NULL) {
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return;
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}
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spin_lock_bh(&n_ptr->lock);
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link = n_ptr->links[b_ptr->identity];
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if (!link) {
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dbg("creating link\n");
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link = tipc_link_create(b_ptr, orig, &media_addr);
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if (!link) {
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spin_unlock_bh(&n_ptr->lock);
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return;
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}
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}
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addr = &link->media_addr;
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if (memcmp(addr, &media_addr, sizeof(*addr))) {
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warn("Resetting link <%s>, peer interface address changed\n",
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link->name);
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memcpy(addr, &media_addr, sizeof(*addr));
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tipc_link_reset(link);
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}
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link_up = tipc_link_is_up(link);
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spin_unlock_bh(&n_ptr->lock);
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if ((type == DSC_RESP_MSG) || link_up)
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return;
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rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
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if (rbuf != NULL) {
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msg_dbg(buf_msg(rbuf),"SEND:");
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b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
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buf_discard(rbuf);
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}
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}
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}
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/**
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* tipc_disc_stop_link_req - stop 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_stop_link_req(struct link_req *req)
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{
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if (!req)
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return;
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k_cancel_timer(&req->timer);
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k_term_timer(&req->timer);
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buf_discard(req->buf);
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kfree(req);
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}
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/**
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* tipc_disc_update_link_req - 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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void tipc_disc_update_link_req(struct link_req *req)
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{
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if (!req)
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return;
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if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
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if (!req->bearer->nodes.count) {
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req->timer_intv = TIPC_LINK_REQ_FAST;
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k_start_timer(&req->timer, req->timer_intv);
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}
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} else if (req->timer_intv == TIPC_LINK_REQ_FAST) {
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if (req->bearer->nodes.count) {
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req->timer_intv = TIPC_LINK_REQ_SLOW;
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k_start_timer(&req->timer, req->timer_intv);
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}
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} else {
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/* leave timer "as is" if haven't yet reached a "normal" rate */
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}
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}
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/**
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* disc_timeout - send a periodic link setup request
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* @req: 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(struct link_req *req)
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{
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spin_lock_bh(&req->bearer->publ.lock);
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req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest);
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if ((req->timer_intv == TIPC_LINK_REQ_SLOW) ||
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(req->timer_intv == TIPC_LINK_REQ_FAST)) {
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/* leave timer interval "as is" if already at a "normal" rate */
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} else {
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req->timer_intv *= 2;
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if (req->timer_intv > TIPC_LINK_REQ_FAST)
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req->timer_intv = TIPC_LINK_REQ_FAST;
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if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
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(req->bearer->nodes.count))
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req->timer_intv = TIPC_LINK_REQ_SLOW;
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}
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k_start_timer(&req->timer, req->timer_intv);
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spin_unlock_bh(&req->bearer->publ.lock);
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}
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/**
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* tipc_disc_init_link_req - start sending periodic link setup requests
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* @b_ptr: ptr to bearer issuing requests
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* @dest: destination address for request messages
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* @dest_domain: network domain of node(s) which should respond to message
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* @req_links: max number of desired links
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*
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* Returns pointer to link request structure, or NULL if unable to create.
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*/
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struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr,
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const struct tipc_media_addr *dest,
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u32 dest_domain,
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u32 req_links)
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{
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struct link_req *req;
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req = (struct link_req *)kmalloc(sizeof(*req), GFP_ATOMIC);
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if (!req)
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return NULL;
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req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr);
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if (!req->buf) {
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kfree(req);
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return NULL;
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}
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memcpy(&req->dest, dest, sizeof(*dest));
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req->bearer = b_ptr;
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req->timer_intv = TIPC_LINK_REQ_INIT;
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k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
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k_start_timer(&req->timer, req->timer_intv);
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return req;
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}
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