Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPVS An implementation of the IP virtual server support for the |
| 3 | * LINUX operating system. IPVS is now implemented as a module |
| 4 | * over the Netfilter framework. IPVS can be used to build a |
| 5 | * high-performance and highly available server based on a |
| 6 | * cluster of servers. |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 9 | * Peter Kese <peter.kese@ijs.si> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | * |
| 16 | * Changes: |
| 17 | * |
| 18 | */ |
| 19 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 20 | #define KMSG_COMPONENT "IPVS" |
| 21 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/spinlock.h> |
Adrian Bunk | 4ffd2e4 | 2006-01-05 12:14:43 -0800 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/string.h> |
| 27 | #include <linux/kmod.h> |
Pavel Emelyanov | 90754f8 | 2008-01-12 02:33:50 -0800 | [diff] [blame] | 28 | #include <linux/sysctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | #include <net/ip_vs.h> |
| 31 | |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 32 | EXPORT_SYMBOL(ip_vs_scheduler_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | /* |
| 34 | * IPVS scheduler list |
| 35 | */ |
| 36 | static LIST_HEAD(ip_vs_schedulers); |
| 37 | |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 38 | /* semaphore for schedulers */ |
| 39 | static DEFINE_MUTEX(ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | |
| 42 | /* |
| 43 | * Bind a service with a scheduler |
| 44 | */ |
| 45 | int ip_vs_bind_scheduler(struct ip_vs_service *svc, |
| 46 | struct ip_vs_scheduler *scheduler) |
| 47 | { |
| 48 | int ret; |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (scheduler->init_service) { |
| 51 | ret = scheduler->init_service(svc); |
| 52 | if (ret) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 53 | pr_err("%s(): init error\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | return ret; |
| 55 | } |
| 56 | } |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 57 | rcu_assign_pointer(svc->scheduler, scheduler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | |
| 62 | /* |
| 63 | * Unbind a service with its scheduler |
| 64 | */ |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 65 | void ip_vs_unbind_scheduler(struct ip_vs_service *svc, |
| 66 | struct ip_vs_scheduler *sched) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 68 | struct ip_vs_scheduler *cur_sched; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 70 | cur_sched = rcu_dereference_protected(svc->scheduler, 1); |
| 71 | /* This check proves that old 'sched' was installed */ |
| 72 | if (!cur_sched) |
Julian Anastasov | ed3ffc4 | 2013-03-22 11:46:50 +0200 | [diff] [blame] | 73 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Julian Anastasov | ed3ffc4 | 2013-03-22 11:46:50 +0200 | [diff] [blame] | 75 | if (sched->done_service) |
| 76 | sched->done_service(svc); |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 77 | /* svc->scheduler can not be set to NULL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | |
| 81 | /* |
| 82 | * Get scheduler in the scheduler list by name |
| 83 | */ |
| 84 | static struct ip_vs_scheduler *ip_vs_sched_getbyname(const char *sched_name) |
| 85 | { |
| 86 | struct ip_vs_scheduler *sched; |
| 87 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 88 | IP_VS_DBG(2, "%s(): sched_name \"%s\"\n", __func__, sched_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 90 | mutex_lock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | list_for_each_entry(sched, &ip_vs_schedulers, n_list) { |
| 93 | /* |
| 94 | * Test and get the modules atomically |
| 95 | */ |
| 96 | if (sched->module && !try_module_get(sched->module)) { |
| 97 | /* |
| 98 | * This scheduler is just deleted |
| 99 | */ |
| 100 | continue; |
| 101 | } |
| 102 | if (strcmp(sched_name, sched->name)==0) { |
| 103 | /* HIT */ |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 104 | mutex_unlock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | return sched; |
| 106 | } |
| 107 | if (sched->module) |
| 108 | module_put(sched->module); |
| 109 | } |
| 110 | |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 111 | mutex_unlock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | return NULL; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | /* |
| 117 | * Lookup scheduler and try to load it if it doesn't exist |
| 118 | */ |
| 119 | struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name) |
| 120 | { |
| 121 | struct ip_vs_scheduler *sched; |
| 122 | |
| 123 | /* |
| 124 | * Search for the scheduler by sched_name |
| 125 | */ |
| 126 | sched = ip_vs_sched_getbyname(sched_name); |
| 127 | |
| 128 | /* |
| 129 | * If scheduler not found, load the module and search again |
| 130 | */ |
| 131 | if (sched == NULL) { |
| 132 | request_module("ip_vs_%s", sched_name); |
| 133 | sched = ip_vs_sched_getbyname(sched_name); |
| 134 | } |
| 135 | |
| 136 | return sched; |
| 137 | } |
| 138 | |
| 139 | void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler) |
| 140 | { |
Simon Horman | 6e08bfb | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 141 | if (scheduler && scheduler->module) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | module_put(scheduler->module); |
| 143 | } |
| 144 | |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 145 | /* |
| 146 | * Common error output helper for schedulers |
| 147 | */ |
| 148 | |
| 149 | void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg) |
| 150 | { |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 151 | struct ip_vs_scheduler *sched; |
| 152 | |
| 153 | sched = rcu_dereference(svc->scheduler); |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 154 | if (svc->fwmark) { |
| 155 | IP_VS_ERR_RL("%s: FWM %u 0x%08X - %s\n", |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 156 | sched->name, svc->fwmark, svc->fwmark, msg); |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 157 | #ifdef CONFIG_IP_VS_IPV6 |
| 158 | } else if (svc->af == AF_INET6) { |
Jesper Dangaard Brouer | 120b9c1 | 2012-09-26 14:05:53 +0200 | [diff] [blame] | 159 | IP_VS_ERR_RL("%s: %s [%pI6c]:%d - %s\n", |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 160 | sched->name, ip_vs_proto_name(svc->protocol), |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 161 | &svc->addr.in6, ntohs(svc->port), msg); |
| 162 | #endif |
| 163 | } else { |
| 164 | IP_VS_ERR_RL("%s: %s %pI4:%d - %s\n", |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 165 | sched->name, ip_vs_proto_name(svc->protocol), |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 166 | &svc->addr.ip, ntohs(svc->port), msg); |
| 167 | } |
| 168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | /* |
| 171 | * Register a scheduler in the scheduler list |
| 172 | */ |
| 173 | int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler) |
| 174 | { |
| 175 | struct ip_vs_scheduler *sched; |
| 176 | |
| 177 | if (!scheduler) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 178 | pr_err("%s(): NULL arg\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return -EINVAL; |
| 180 | } |
| 181 | |
| 182 | if (!scheduler->name) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 183 | pr_err("%s(): NULL scheduler_name\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return -EINVAL; |
| 185 | } |
| 186 | |
| 187 | /* increase the module use count */ |
| 188 | ip_vs_use_count_inc(); |
| 189 | |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 190 | mutex_lock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Sven Wegener | 66a0be4 | 2008-08-10 09:18:02 +0000 | [diff] [blame] | 192 | if (!list_empty(&scheduler->n_list)) { |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 193 | mutex_unlock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | ip_vs_use_count_dec(); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 195 | pr_err("%s(): [%s] scheduler already linked\n", |
| 196 | __func__, scheduler->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | return -EINVAL; |
| 198 | } |
| 199 | |
| 200 | /* |
Pavel Emelyanov | 4ac63ad6 | 2007-12-04 00:45:06 -0800 | [diff] [blame] | 201 | * Make sure that the scheduler with this name doesn't exist |
| 202 | * in the scheduler list. |
| 203 | */ |
| 204 | list_for_each_entry(sched, &ip_vs_schedulers, n_list) { |
| 205 | if (strcmp(scheduler->name, sched->name) == 0) { |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 206 | mutex_unlock(&ip_vs_sched_mutex); |
Pavel Emelyanov | 4ac63ad6 | 2007-12-04 00:45:06 -0800 | [diff] [blame] | 207 | ip_vs_use_count_dec(); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 208 | pr_err("%s(): [%s] scheduler already existed " |
| 209 | "in the system\n", __func__, scheduler->name); |
Pavel Emelyanov | 4ac63ad6 | 2007-12-04 00:45:06 -0800 | [diff] [blame] | 210 | return -EINVAL; |
| 211 | } |
| 212 | } |
| 213 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | * Add it into the d-linked scheduler list |
| 215 | */ |
| 216 | list_add(&scheduler->n_list, &ip_vs_schedulers); |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 217 | mutex_unlock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 219 | pr_info("[%s] scheduler registered.\n", scheduler->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | |
| 225 | /* |
| 226 | * Unregister a scheduler from the scheduler list |
| 227 | */ |
| 228 | int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler) |
| 229 | { |
| 230 | if (!scheduler) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 231 | pr_err("%s(): NULL arg\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return -EINVAL; |
| 233 | } |
| 234 | |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 235 | mutex_lock(&ip_vs_sched_mutex); |
Sven Wegener | 66a0be4 | 2008-08-10 09:18:02 +0000 | [diff] [blame] | 236 | if (list_empty(&scheduler->n_list)) { |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 237 | mutex_unlock(&ip_vs_sched_mutex); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 238 | pr_err("%s(): [%s] scheduler is not in the list. failed\n", |
| 239 | __func__, scheduler->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | return -EINVAL; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Remove it from the d-linked scheduler list |
| 245 | */ |
| 246 | list_del(&scheduler->n_list); |
Julian Anastasov | 71dfa98 | 2013-03-22 11:46:36 +0200 | [diff] [blame] | 247 | mutex_unlock(&ip_vs_sched_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | /* decrease the module use count */ |
| 250 | ip_vs_use_count_dec(); |
| 251 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 252 | pr_info("[%s] scheduler unregistered.\n", scheduler->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | return 0; |
| 255 | } |