Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * net/tipc/discover.c |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 3 | * |
Per Liden | 9da1c8b | 2006-01-11 18:40:41 +0100 | [diff] [blame] | 4 | * Copyright (c) 2003-2006, Ericsson AB |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 5 | * Copyright (c) 2005-2006, 2010-2011, Wind River Systems |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 8 | * Redistribution and use in source and binary forms, with or without |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the names of the copyright holders nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 19 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 20 | * Alternatively, this software may be distributed under the terms of the |
| 21 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 22 | * Software Foundation. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "core.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 38 | #include "link.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 39 | #include "discover.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 40 | |
| 41 | #define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */ |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 42 | #define TIPC_LINK_REQ_FAST 1000 /* max delay if bearer has no links */ |
| 43 | #define TIPC_LINK_REQ_SLOW 60000 /* max delay if bearer has links */ |
| 44 | #define TIPC_LINK_REQ_INACTIVE 0xffffffff /* indicates no timer in use */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 45 | |
| 46 | |
| 47 | /** |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 48 | * struct tipc_link_req - information about an ongoing link setup request |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 49 | * @bearer: bearer issuing requests |
| 50 | * @dest: destination address for request messages |
Allan Stephens | 66e019a | 2011-04-20 16:24:07 -0500 | [diff] [blame] | 51 | * @domain: network domain to which links can be established |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 52 | * @num_nodes: number of nodes currently discovered (i.e. with an active link) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 53 | * @buf: request message to be (repeatedly) sent |
| 54 | * @timer: timer governing period between requests |
| 55 | * @timer_intv: current interval between requests (in ms) |
| 56 | */ |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 57 | struct tipc_link_req { |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 58 | struct tipc_bearer *bearer; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 59 | struct tipc_media_addr dest; |
Allan Stephens | 66e019a | 2011-04-20 16:24:07 -0500 | [diff] [blame] | 60 | u32 domain; |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 61 | int num_nodes; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 62 | struct sk_buff *buf; |
| 63 | struct timer_list timer; |
| 64 | unsigned int timer_intv; |
| 65 | }; |
| 66 | |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 67 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 68 | * tipc_disc_init_msg - initialize a link setup message |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 69 | * @type: message type (request or response) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 70 | * @dest_domain: network domain of node(s) which should respond to message |
| 71 | * @b_ptr: ptr to bearer issuing message |
| 72 | */ |
| 73 | |
Adrian Bunk | 988f088 | 2006-03-20 22:37:52 -0800 | [diff] [blame] | 74 | static struct sk_buff *tipc_disc_init_msg(u32 type, |
Adrian Bunk | 988f088 | 2006-03-20 22:37:52 -0800 | [diff] [blame] | 75 | u32 dest_domain, |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 76 | struct tipc_bearer *b_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 77 | { |
Allan Stephens | d901a42 | 2011-02-28 16:02:30 -0500 | [diff] [blame] | 78 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 79 | struct tipc_msg *msg; |
| 80 | |
| 81 | if (buf) { |
| 82 | msg = buf_msg(buf); |
Allan Stephens | d901a42 | 2011-02-28 16:02:30 -0500 | [diff] [blame] | 83 | tipc_msg_init(msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain); |
Allan Stephens | 40aecb1 | 2008-06-04 17:54:48 -0700 | [diff] [blame] | 84 | msg_set_non_seq(msg, 1); |
Allan Stephens | fc0eea6 | 2011-10-28 16:26:41 -0400 | [diff] [blame] | 85 | msg_set_node_sig(msg, tipc_random); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 86 | msg_set_dest_domain(msg, dest_domain); |
| 87 | msg_set_bc_netid(msg, tipc_net_id); |
Allan Stephens | 3d749a6 | 2011-10-07 15:19:11 -0400 | [diff] [blame] | 88 | b_ptr->media->addr2msg(&b_ptr->addr, msg_media_addr(msg)); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 89 | } |
| 90 | return buf; |
| 91 | } |
| 92 | |
| 93 | /** |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 94 | * disc_dupl_alert - issue node address duplication alert |
| 95 | * @b_ptr: pointer to bearer detecting duplication |
| 96 | * @node_addr: duplicated node address |
| 97 | * @media_addr: media address advertised by duplicated node |
| 98 | */ |
| 99 | |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 100 | static void disc_dupl_alert(struct tipc_bearer *b_ptr, u32 node_addr, |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 101 | struct tipc_media_addr *media_addr) |
| 102 | { |
| 103 | char node_addr_str[16]; |
| 104 | char media_addr_str[64]; |
| 105 | struct print_buf pb; |
| 106 | |
Allan Stephens | c68ca7b | 2010-05-11 14:30:12 +0000 | [diff] [blame] | 107 | tipc_addr_string_fill(node_addr_str, node_addr); |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 108 | tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str)); |
| 109 | tipc_media_addr_printf(&pb, media_addr); |
| 110 | tipc_printbuf_validate(&pb); |
| 111 | warn("Duplicate %s using %s seen on <%s>\n", |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 112 | node_addr_str, media_addr_str, b_ptr->name); |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 116 | * tipc_disc_recv_msg - handle incoming link setup message (request or response) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 117 | * @buf: buffer containing message |
Allan Stephens | 1265a02 | 2008-06-04 17:32:35 -0700 | [diff] [blame] | 118 | * @b_ptr: bearer that message arrived on |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 119 | */ |
| 120 | |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 121 | void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 122 | { |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 123 | struct tipc_node *n_ptr; |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 124 | struct tipc_link *link; |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 125 | struct tipc_media_addr media_addr; |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 126 | struct sk_buff *rbuf; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 127 | struct tipc_msg *msg = buf_msg(buf); |
| 128 | u32 dest = msg_dest_domain(msg); |
| 129 | u32 orig = msg_prevnode(msg); |
| 130 | u32 net_id = msg_bc_netid(msg); |
| 131 | u32 type = msg_type(msg); |
Allan Stephens | fc0eea6 | 2011-10-28 16:26:41 -0400 | [diff] [blame] | 132 | u32 signature = msg_node_sig(msg); |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 133 | int addr_mismatch; |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 134 | int link_fully_up; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 135 | |
Allan Stephens | d6d4577 | 2011-10-07 15:48:41 -0400 | [diff] [blame] | 136 | media_addr.broadcast = 1; |
Allan Stephens | 3d749a6 | 2011-10-07 15:19:11 -0400 | [diff] [blame] | 137 | b_ptr->media->msg2addr(&media_addr, msg_media_addr(msg)); |
Allan Stephens | 5f6d912 | 2011-11-04 13:24:29 -0400 | [diff] [blame] | 138 | kfree_skb(buf); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 139 | |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 140 | /* Ensure message from node is valid and communication is permitted */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 141 | if (net_id != tipc_net_id) |
| 142 | return; |
Allan Stephens | d6d4577 | 2011-10-07 15:48:41 -0400 | [diff] [blame] | 143 | if (media_addr.broadcast) |
| 144 | return; |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 145 | if (!tipc_addr_domain_valid(dest)) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 146 | return; |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 147 | if (!tipc_addr_node_valid(orig)) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 148 | return; |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 149 | if (orig == tipc_own_addr) { |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 150 | if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr))) |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 151 | disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 152 | return; |
Allan Stephens | e91ed0b | 2006-10-16 21:44:59 -0700 | [diff] [blame] | 153 | } |
Allan Stephens | c68ca7b | 2010-05-11 14:30:12 +0000 | [diff] [blame] | 154 | if (!tipc_in_scope(dest, tipc_own_addr)) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 155 | return; |
Allan Stephens | 66e019a | 2011-04-20 16:24:07 -0500 | [diff] [blame] | 156 | if (!tipc_in_scope(b_ptr->link_req->domain, orig)) |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 157 | return; |
Allan Stephens | 2de07f6 | 2006-10-16 21:57:13 -0700 | [diff] [blame] | 158 | |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 159 | /* Locate structure corresponding to requesting node */ |
| 160 | n_ptr = tipc_node_find(orig); |
| 161 | if (!n_ptr) { |
| 162 | n_ptr = tipc_node_create(orig); |
| 163 | if (!n_ptr) |
Allan Stephens | 5a68d5e | 2010-08-17 11:00:16 +0000 | [diff] [blame] | 164 | return; |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 165 | } |
| 166 | tipc_node_lock(n_ptr); |
Allan Stephens | 5a68d5e | 2010-08-17 11:00:16 +0000 | [diff] [blame] | 167 | |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 168 | /* Prepare to validate requesting node's signature and media address */ |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 169 | link = n_ptr->links[b_ptr->identity]; |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 170 | addr_mismatch = (link != NULL) && |
| 171 | memcmp(&link->media_addr, &media_addr, sizeof(media_addr)); |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 172 | |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 173 | /* |
| 174 | * Ensure discovery message's signature is correct |
| 175 | * |
| 176 | * If signature is incorrect and there is no working link to the node, |
| 177 | * accept the new signature but invalidate all existing links to the |
| 178 | * node so they won't re-activate without a new discovery message. |
| 179 | * |
| 180 | * If signature is incorrect and the requested link to the node is |
| 181 | * working, accept the new signature. (This is an instance of delayed |
| 182 | * rediscovery, where a link endpoint was able to re-establish contact |
| 183 | * with its peer endpoint on a node that rebooted before receiving a |
| 184 | * discovery message from that node.) |
| 185 | * |
| 186 | * If signature is incorrect and there is a working link to the node |
| 187 | * that is not the requested link, reject the request (must be from |
| 188 | * a duplicate node). |
| 189 | */ |
| 190 | if (signature != n_ptr->signature) { |
| 191 | if (n_ptr->working_links == 0) { |
| 192 | struct tipc_link *curr_link; |
| 193 | int i; |
| 194 | |
| 195 | for (i = 0; i < MAX_BEARERS; i++) { |
| 196 | curr_link = n_ptr->links[i]; |
| 197 | if (curr_link) { |
| 198 | memset(&curr_link->media_addr, 0, |
| 199 | sizeof(media_addr)); |
| 200 | tipc_link_reset(curr_link); |
| 201 | } |
| 202 | } |
| 203 | addr_mismatch = (link != NULL); |
| 204 | } else if (tipc_link_is_up(link) && !addr_mismatch) { |
| 205 | /* delayed rediscovery */ |
| 206 | } else { |
| 207 | disc_dupl_alert(b_ptr, orig, &media_addr); |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 208 | tipc_node_unlock(n_ptr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 209 | return; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 210 | } |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 211 | n_ptr->signature = signature; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 212 | } |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 213 | |
| 214 | /* |
| 215 | * Ensure requesting node's media address is correct |
| 216 | * |
| 217 | * If media address doesn't match and the link is working, reject the |
| 218 | * request (must be from a duplicate node). |
| 219 | * |
| 220 | * If media address doesn't match and the link is not working, accept |
| 221 | * the new media address and reset the link to ensure it starts up |
| 222 | * cleanly. |
| 223 | */ |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 224 | |
| 225 | if (addr_mismatch) { |
| 226 | if (tipc_link_is_up(link)) { |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 227 | disc_dupl_alert(b_ptr, orig, &media_addr); |
| 228 | tipc_node_unlock(n_ptr); |
| 229 | return; |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 230 | } else { |
| 231 | memcpy(&link->media_addr, &media_addr, |
| 232 | sizeof(media_addr)); |
| 233 | tipc_link_reset(link); |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 234 | } |
Allan Stephens | 97878a4 | 2011-10-28 17:30:08 -0400 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | /* Create a link endpoint for this bearer, if necessary */ |
| 238 | if (!link) { |
| 239 | link = tipc_link_create(n_ptr, b_ptr, &media_addr); |
| 240 | if (!link) { |
| 241 | tipc_node_unlock(n_ptr); |
| 242 | return; |
| 243 | } |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | /* Accept discovery message & send response, if necessary */ |
| 247 | link_fully_up = link_working_working(link); |
Allan Stephens | fa2bae2 | 2011-02-28 10:56:23 -0500 | [diff] [blame] | 248 | |
Allan Stephens | f9107eb | 2011-02-28 11:04:08 -0500 | [diff] [blame] | 249 | if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) { |
Allan Stephens | fa2bae2 | 2011-02-28 10:56:23 -0500 | [diff] [blame] | 250 | rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr); |
| 251 | if (rbuf) { |
| 252 | b_ptr->media->send_msg(rbuf, b_ptr, &media_addr); |
Allan Stephens | 5f6d912 | 2011-11-04 13:24:29 -0400 | [diff] [blame] | 253 | kfree_skb(rbuf); |
Allan Stephens | fa2bae2 | 2011-02-28 10:56:23 -0500 | [diff] [blame] | 254 | } |
Allan Stephens | a728750 | 2011-02-28 10:03:05 -0500 | [diff] [blame] | 255 | } |
Allan Stephens | fa2bae2 | 2011-02-28 10:56:23 -0500 | [diff] [blame] | 256 | |
| 257 | tipc_node_unlock(n_ptr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | /** |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 261 | * disc_update - update frequency of periodic link setup requests |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 262 | * @req: ptr to link request structure |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 263 | * |
| 264 | * Reinitiates discovery process if discovery object has no associated nodes |
| 265 | * and is either not currently searching or is searching at a slow rate |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 266 | */ |
| 267 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 268 | static void disc_update(struct tipc_link_req *req) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 269 | { |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 270 | if (!req->num_nodes) { |
| 271 | if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) || |
| 272 | (req->timer_intv > TIPC_LINK_REQ_FAST)) { |
| 273 | req->timer_intv = TIPC_LINK_REQ_INIT; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 274 | k_start_timer(&req->timer, req->timer_intv); |
| 275 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 276 | } |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 277 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 278 | |
| 279 | /** |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 280 | * tipc_disc_add_dest - increment set of discovered nodes |
| 281 | * @req: ptr to link request structure |
| 282 | */ |
| 283 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 284 | void tipc_disc_add_dest(struct tipc_link_req *req) |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 285 | { |
| 286 | req->num_nodes++; |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | /** |
| 290 | * tipc_disc_remove_dest - decrement set of discovered nodes |
| 291 | * @req: ptr to link request structure |
| 292 | */ |
| 293 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 294 | void tipc_disc_remove_dest(struct tipc_link_req *req) |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 295 | { |
| 296 | req->num_nodes--; |
| 297 | disc_update(req); |
| 298 | } |
| 299 | |
| 300 | /** |
Allan Stephens | 691a620 | 2011-04-21 16:28:02 -0500 | [diff] [blame] | 301 | * disc_send_msg - send link setup request message |
| 302 | * @req: ptr to link request structure |
| 303 | */ |
| 304 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 305 | static void disc_send_msg(struct tipc_link_req *req) |
Allan Stephens | 691a620 | 2011-04-21 16:28:02 -0500 | [diff] [blame] | 306 | { |
| 307 | if (!req->bearer->blocked) |
| 308 | tipc_bearer_send(req->bearer, req->buf, &req->dest); |
| 309 | } |
| 310 | |
| 311 | /** |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 312 | * disc_timeout - send a periodic link setup request |
| 313 | * @req: ptr to link request structure |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 314 | * |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 315 | * Called whenever a link setup request timer associated with a bearer expires. |
| 316 | */ |
| 317 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 318 | static void disc_timeout(struct tipc_link_req *req) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 319 | { |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 320 | int max_delay; |
| 321 | |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 322 | spin_lock_bh(&req->bearer->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 323 | |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 324 | /* Stop searching if only desired node has been found */ |
| 325 | |
| 326 | if (tipc_node(req->domain) && req->num_nodes) { |
| 327 | req->timer_intv = TIPC_LINK_REQ_INACTIVE; |
| 328 | goto exit; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Send discovery message, then update discovery timer |
| 333 | * |
| 334 | * Keep doubling time between requests until limit is reached; |
| 335 | * hold at fast polling rate if don't have any associated nodes, |
| 336 | * otherwise hold at slow polling rate |
| 337 | */ |
| 338 | |
Allan Stephens | 691a620 | 2011-04-21 16:28:02 -0500 | [diff] [blame] | 339 | disc_send_msg(req); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 340 | |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 341 | req->timer_intv *= 2; |
| 342 | if (req->num_nodes) |
| 343 | max_delay = TIPC_LINK_REQ_SLOW; |
| 344 | else |
| 345 | max_delay = TIPC_LINK_REQ_FAST; |
| 346 | if (req->timer_intv > max_delay) |
| 347 | req->timer_intv = max_delay; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 348 | |
Allan Stephens | 972a77f | 2011-04-21 20:34:03 -0500 | [diff] [blame] | 349 | k_start_timer(&req->timer, req->timer_intv); |
| 350 | exit: |
Allan Stephens | 2d627b9 | 2011-01-07 13:00:11 -0500 | [diff] [blame] | 351 | spin_unlock_bh(&req->bearer->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | /** |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 355 | * tipc_disc_create - create object to send periodic link setup requests |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 356 | * @b_ptr: ptr to bearer issuing requests |
| 357 | * @dest: destination address for request messages |
Allan Stephens | 66e019a | 2011-04-20 16:24:07 -0500 | [diff] [blame] | 358 | * @dest_domain: network domain to which links can be established |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 359 | * |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 360 | * Returns 0 if successful, otherwise -errno. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 361 | */ |
| 362 | |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 363 | int tipc_disc_create(struct tipc_bearer *b_ptr, |
| 364 | struct tipc_media_addr *dest, u32 dest_domain) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 365 | { |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 366 | struct tipc_link_req *req; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 367 | |
Panagiotis Issaris | 9df3f3d | 2006-07-21 15:52:20 -0700 | [diff] [blame] | 368 | req = kmalloc(sizeof(*req), GFP_ATOMIC); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 369 | if (!req) |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 370 | return -ENOMEM; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 371 | |
Allan Stephens | 2e07dda | 2011-01-25 14:39:59 -0500 | [diff] [blame] | 372 | req->buf = tipc_disc_init_msg(DSC_REQ_MSG, dest_domain, b_ptr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 373 | if (!req->buf) { |
| 374 | kfree(req); |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 375 | return -ENOMSG; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | memcpy(&req->dest, dest, sizeof(*dest)); |
| 379 | req->bearer = b_ptr; |
Allan Stephens | 66e019a | 2011-04-20 16:24:07 -0500 | [diff] [blame] | 380 | req->domain = dest_domain; |
Allan Stephens | 1209966 | 2011-04-21 19:05:25 -0500 | [diff] [blame] | 381 | req->num_nodes = 0; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 382 | req->timer_intv = TIPC_LINK_REQ_INIT; |
| 383 | k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req); |
| 384 | k_start_timer(&req->timer, req->timer_intv); |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 385 | b_ptr->link_req = req; |
Allan Stephens | 691a620 | 2011-04-21 16:28:02 -0500 | [diff] [blame] | 386 | disc_send_msg(req); |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * tipc_disc_delete - destroy object sending periodic link setup requests |
| 392 | * @req: ptr to link request structure |
| 393 | */ |
| 394 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 395 | void tipc_disc_delete(struct tipc_link_req *req) |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 396 | { |
| 397 | k_cancel_timer(&req->timer); |
| 398 | k_term_timer(&req->timer); |
Allan Stephens | 5f6d912 | 2011-11-04 13:24:29 -0400 | [diff] [blame] | 399 | kfree_skb(req->buf); |
Allan Stephens | 3a777ff | 2011-04-21 13:58:26 -0500 | [diff] [blame] | 400 | kfree(req); |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 401 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 402 | |