| /* |
| * net/tipc/discover.c |
| * |
| * Copyright (c) 2003-2006, Ericsson AB |
| * Copyright (c) 2005-2006, 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 "dbg.h" |
| #include "link.h" |
| #include "zone.h" |
| #include "discover.h" |
| #include "port.h" |
| #include "name_table.h" |
| |
| #define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */ |
| #define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */ |
| #define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */ |
| |
| #if 0 |
| #define GET_NODE_INFO 300 |
| #define GET_NODE_INFO_RESULT 301 |
| #define FORWARD_LINK_PROBE 302 |
| #define LINK_REQUEST_REJECTED 303 |
| #define LINK_REQUEST_ACCEPTED 304 |
| #define DROP_LINK_REQUEST 305 |
| #define CHECK_LINK_COUNT 306 |
| #endif |
| |
| /* |
| * TODO: Most of the inter-cluster setup stuff should be |
| * rewritten, and be made conformant with specification. |
| */ |
| |
| |
| /** |
| * struct link_req - information about an ongoing link setup request |
| * @bearer: bearer issuing requests |
| * @dest: destination address for request messages |
| * @buf: request message to be (repeatedly) sent |
| * @timer: timer governing period between requests |
| * @timer_intv: current interval between requests (in ms) |
| */ |
| struct link_req { |
| struct bearer *bearer; |
| struct tipc_media_addr dest; |
| struct sk_buff *buf; |
| struct timer_list timer; |
| unsigned int timer_intv; |
| }; |
| |
| |
| #if 0 |
| int disc_create_link(const struct tipc_link_create *argv) |
| { |
| /* |
| * Code for inter cluster link setup here |
| */ |
| return TIPC_OK; |
| } |
| #endif |
| |
| /* |
| * disc_lost_link(): A link has lost contact |
| */ |
| |
| void tipc_disc_link_event(u32 addr, char *name, int up) |
| { |
| if (in_own_cluster(addr)) |
| return; |
| /* |
| * Code for inter cluster link setup here |
| */ |
| } |
| |
| /** |
| * tipc_disc_init_msg - initialize a link setup message |
| * @type: message type (request or response) |
| * @req_links: number of links associated with message |
| * @dest_domain: network domain of node(s) which should respond to message |
| * @b_ptr: ptr to bearer issuing message |
| */ |
| |
| static struct sk_buff *tipc_disc_init_msg(u32 type, |
| u32 req_links, |
| u32 dest_domain, |
| struct bearer *b_ptr) |
| { |
| struct sk_buff *buf = buf_acquire(DSC_H_SIZE); |
| struct tipc_msg *msg; |
| |
| if (buf) { |
| msg = buf_msg(buf); |
| msg_init(msg, LINK_CONFIG, type, TIPC_OK, DSC_H_SIZE, |
| dest_domain); |
| msg_set_non_seq(msg); |
| msg_set_req_links(msg, req_links); |
| msg_set_dest_domain(msg, dest_domain); |
| msg_set_bc_netid(msg, tipc_net_id); |
| msg_set_media_addr(msg, &b_ptr->publ.addr); |
| } |
| return buf; |
| } |
| |
| /** |
| * disc_dupl_alert - issue node address duplication alert |
| * @b_ptr: pointer to bearer detecting duplication |
| * @node_addr: duplicated node address |
| * @media_addr: media address advertised by duplicated node |
| */ |
| |
| static void disc_dupl_alert(struct bearer *b_ptr, u32 node_addr, |
| struct tipc_media_addr *media_addr) |
| { |
| char node_addr_str[16]; |
| char media_addr_str[64]; |
| struct print_buf pb; |
| |
| addr_string_fill(node_addr_str, node_addr); |
| tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str)); |
| tipc_media_addr_printf(&pb, media_addr); |
| tipc_printbuf_validate(&pb); |
| warn("Duplicate %s using %s seen on <%s>\n", |
| node_addr_str, media_addr_str, b_ptr->publ.name); |
| } |
| |
| /** |
| * tipc_disc_recv_msg - handle incoming link setup message (request or response) |
| * @buf: buffer containing message |
| */ |
| |
| void tipc_disc_recv_msg(struct sk_buff *buf) |
| { |
| struct bearer *b_ptr = (struct bearer *)TIPC_SKB_CB(buf)->handle; |
| struct link *link; |
| struct tipc_media_addr media_addr; |
| struct tipc_msg *msg = buf_msg(buf); |
| u32 dest = msg_dest_domain(msg); |
| u32 orig = msg_prevnode(msg); |
| u32 net_id = msg_bc_netid(msg); |
| u32 type = msg_type(msg); |
| |
| msg_get_media_addr(msg,&media_addr); |
| msg_dbg(msg, "RECV:"); |
| buf_discard(buf); |
| |
| if (net_id != tipc_net_id) |
| return; |
| if (!tipc_addr_domain_valid(dest)) |
| return; |
| if (!tipc_addr_node_valid(orig)) |
| return; |
| if (orig == tipc_own_addr) { |
| if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr))) |
| disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr); |
| return; |
| } |
| if (!in_scope(dest, tipc_own_addr)) |
| return; |
| if (is_slave(tipc_own_addr) && is_slave(orig)) |
| return; |
| if (is_slave(orig) && !in_own_cluster(orig)) |
| return; |
| if (in_own_cluster(orig)) { |
| /* Always accept link here */ |
| struct sk_buff *rbuf; |
| struct tipc_media_addr *addr; |
| struct node *n_ptr = tipc_node_find(orig); |
| int link_up; |
| dbg(" in own cluster\n"); |
| if (n_ptr == NULL) { |
| n_ptr = tipc_node_create(orig); |
| } |
| if (n_ptr == NULL) { |
| return; |
| } |
| spin_lock_bh(&n_ptr->lock); |
| link = n_ptr->links[b_ptr->identity]; |
| if (!link) { |
| dbg("creating link\n"); |
| link = tipc_link_create(b_ptr, orig, &media_addr); |
| if (!link) { |
| spin_unlock_bh(&n_ptr->lock); |
| return; |
| } |
| } |
| addr = &link->media_addr; |
| if (memcmp(addr, &media_addr, sizeof(*addr))) { |
| if (tipc_link_is_up(link) || (!link->started)) { |
| disc_dupl_alert(b_ptr, orig, &media_addr); |
| spin_unlock_bh(&n_ptr->lock); |
| return; |
| } |
| warn("Resetting link <%s>, peer interface address changed\n", |
| link->name); |
| memcpy(addr, &media_addr, sizeof(*addr)); |
| tipc_link_reset(link); |
| } |
| link_up = tipc_link_is_up(link); |
| spin_unlock_bh(&n_ptr->lock); |
| if ((type == DSC_RESP_MSG) || link_up) |
| return; |
| rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr); |
| if (rbuf != NULL) { |
| msg_dbg(buf_msg(rbuf),"SEND:"); |
| b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr); |
| buf_discard(rbuf); |
| } |
| } |
| } |
| |
| /** |
| * tipc_disc_stop_link_req - stop sending periodic link setup requests |
| * @req: ptr to link request structure |
| */ |
| |
| void tipc_disc_stop_link_req(struct link_req *req) |
| { |
| if (!req) |
| return; |
| |
| k_cancel_timer(&req->timer); |
| k_term_timer(&req->timer); |
| buf_discard(req->buf); |
| kfree(req); |
| } |
| |
| /** |
| * tipc_disc_update_link_req - update frequency of periodic link setup requests |
| * @req: ptr to link request structure |
| */ |
| |
| void tipc_disc_update_link_req(struct link_req *req) |
| { |
| if (!req) |
| return; |
| |
| if (req->timer_intv == TIPC_LINK_REQ_SLOW) { |
| if (!req->bearer->nodes.count) { |
| req->timer_intv = TIPC_LINK_REQ_FAST; |
| k_start_timer(&req->timer, req->timer_intv); |
| } |
| } else if (req->timer_intv == TIPC_LINK_REQ_FAST) { |
| if (req->bearer->nodes.count) { |
| req->timer_intv = TIPC_LINK_REQ_SLOW; |
| k_start_timer(&req->timer, req->timer_intv); |
| } |
| } else { |
| /* leave timer "as is" if haven't yet reached a "normal" rate */ |
| } |
| } |
| |
| /** |
| * disc_timeout - send a periodic link setup request |
| * @req: ptr to link request structure |
| * |
| * Called whenever a link setup request timer associated with a bearer expires. |
| */ |
| |
| static void disc_timeout(struct link_req *req) |
| { |
| spin_lock_bh(&req->bearer->publ.lock); |
| |
| req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest); |
| |
| if ((req->timer_intv == TIPC_LINK_REQ_SLOW) || |
| (req->timer_intv == TIPC_LINK_REQ_FAST)) { |
| /* leave timer interval "as is" if already at a "normal" rate */ |
| } else { |
| req->timer_intv *= 2; |
| if (req->timer_intv > TIPC_LINK_REQ_FAST) |
| req->timer_intv = TIPC_LINK_REQ_FAST; |
| if ((req->timer_intv == TIPC_LINK_REQ_FAST) && |
| (req->bearer->nodes.count)) |
| req->timer_intv = TIPC_LINK_REQ_SLOW; |
| } |
| k_start_timer(&req->timer, req->timer_intv); |
| |
| spin_unlock_bh(&req->bearer->publ.lock); |
| } |
| |
| /** |
| * tipc_disc_init_link_req - start sending periodic link setup requests |
| * @b_ptr: ptr to bearer issuing requests |
| * @dest: destination address for request messages |
| * @dest_domain: network domain of node(s) which should respond to message |
| * @req_links: max number of desired links |
| * |
| * Returns pointer to link request structure, or NULL if unable to create. |
| */ |
| |
| struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr, |
| const struct tipc_media_addr *dest, |
| u32 dest_domain, |
| u32 req_links) |
| { |
| struct link_req *req; |
| |
| req = kmalloc(sizeof(*req), GFP_ATOMIC); |
| if (!req) |
| return NULL; |
| |
| req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr); |
| if (!req->buf) { |
| kfree(req); |
| return NULL; |
| } |
| |
| memcpy(&req->dest, dest, sizeof(*dest)); |
| req->bearer = b_ptr; |
| req->timer_intv = TIPC_LINK_REQ_INIT; |
| k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req); |
| k_start_timer(&req->timer, req->timer_intv); |
| return req; |
| } |
| |