Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPVS: Locality-Based Least-Connection scheduling module |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: Wensong Zhang <wensong@gnuchina.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * Changes: |
| 12 | * Martin Hamilton : fixed the terrible locking bugs |
| 13 | * *lock(tbl->lock) ==> *lock(&tbl->lock) |
Uwe Kleine-König | 421f91d | 2010-06-11 12:17:00 +0200 | [diff] [blame] | 14 | * Wensong Zhang : fixed the uninitialized tbl->lock bug |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * Wensong Zhang : added doing full expiration check to |
| 16 | * collect stale entries of 24+ hours when |
| 17 | * no partial expire check in a half hour |
| 18 | * Julian Anastasov : replaced del_timer call with del_timer_sync |
| 19 | * to avoid the possible race between timer |
| 20 | * handler and del_timer thread in SMP |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * The lblc algorithm is as follows (pseudo code): |
| 26 | * |
| 27 | * if cachenode[dest_ip] is null then |
| 28 | * n, cachenode[dest_ip] <- {weighted least-conn node}; |
| 29 | * else |
| 30 | * n <- cachenode[dest_ip]; |
| 31 | * if (n is dead) OR |
| 32 | * (n.conns>n.weight AND |
| 33 | * there is a node m with m.conns<m.weight/2) then |
| 34 | * n, cachenode[dest_ip] <- {weighted least-conn node}; |
| 35 | * |
| 36 | * return n; |
| 37 | * |
| 38 | * Thanks must go to Wenzhuo Zhang for talking WCCP to me and pushing |
| 39 | * me to write this module. |
| 40 | */ |
| 41 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 42 | #define KMSG_COMPONENT "IPVS" |
| 43 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 44 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 45 | #include <linux/ip.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 46 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/module.h> |
| 48 | #include <linux/kernel.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 49 | #include <linux/skbuff.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 50 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | /* for sysctl */ |
| 53 | #include <linux/fs.h> |
| 54 | #include <linux/sysctl.h> |
| 55 | |
| 56 | #include <net/ip_vs.h> |
| 57 | |
| 58 | |
| 59 | /* |
| 60 | * It is for garbage collection of stale IPVS lblc entries, |
| 61 | * when the table is full. |
| 62 | */ |
| 63 | #define CHECK_EXPIRE_INTERVAL (60*HZ) |
| 64 | #define ENTRY_TIMEOUT (6*60*HZ) |
| 65 | |
Simon Horman | b27d777 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 66 | #define DEFAULT_EXPIRATION (24*60*60*HZ) |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | /* |
| 69 | * It is for full expiration check. |
| 70 | * When there is no partial expiration check (garbage collection) |
| 71 | * in a half hour, do a full expiration check to collect stale |
| 72 | * entries that haven't been touched for a day. |
| 73 | */ |
| 74 | #define COUNT_FOR_FULL_EXPIRATION 30 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | |
| 77 | /* |
| 78 | * for IPVS lblc entry hash table |
| 79 | */ |
| 80 | #ifndef CONFIG_IP_VS_LBLC_TAB_BITS |
| 81 | #define CONFIG_IP_VS_LBLC_TAB_BITS 10 |
| 82 | #endif |
| 83 | #define IP_VS_LBLC_TAB_BITS CONFIG_IP_VS_LBLC_TAB_BITS |
| 84 | #define IP_VS_LBLC_TAB_SIZE (1 << IP_VS_LBLC_TAB_BITS) |
| 85 | #define IP_VS_LBLC_TAB_MASK (IP_VS_LBLC_TAB_SIZE - 1) |
| 86 | |
| 87 | |
| 88 | /* |
| 89 | * IPVS lblc entry represents an association between destination |
| 90 | * IP address and its destination server |
| 91 | */ |
| 92 | struct ip_vs_lblc_entry { |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 93 | struct hlist_node list; |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 94 | int af; /* address family */ |
| 95 | union nf_inet_addr addr; /* destination IP address */ |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 96 | struct ip_vs_dest *dest; /* real server (cache) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | unsigned long lastuse; /* last used time */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 98 | struct rcu_head rcu_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | }; |
| 100 | |
| 101 | |
| 102 | /* |
| 103 | * IPVS lblc hash table |
| 104 | */ |
| 105 | struct ip_vs_lblc_table { |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 106 | struct rcu_head rcu_head; |
Julian Anastasov | f33c8b9 | 2013-04-17 23:50:47 +0300 | [diff] [blame] | 107 | struct hlist_head bucket[IP_VS_LBLC_TAB_SIZE]; /* hash bucket */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 108 | struct timer_list periodic_timer; /* collect stale entries */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | atomic_t entries; /* number of entries */ |
| 110 | int max_size; /* maximum size of entries */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | int rover; /* rover for expire check */ |
| 112 | int counter; /* counter for no expire */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 113 | bool dead; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | }; |
| 115 | |
| 116 | |
| 117 | /* |
| 118 | * IPVS LBLC sysctl table |
| 119 | */ |
Simon Horman | fb1de43 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 120 | #ifdef CONFIG_SYSCTL |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 121 | static struct ctl_table vs_vars_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | .procname = "lblc_expiration", |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 124 | .data = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | .maxlen = sizeof(int), |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 126 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 127 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 129 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | }; |
Simon Horman | fb1de43 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 131 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 133 | static void ip_vs_lblc_rcu_free(struct rcu_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 135 | struct ip_vs_lblc_entry *en = container_of(head, |
| 136 | struct ip_vs_lblc_entry, |
| 137 | rcu_head); |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 138 | |
Julian Anastasov | 9e4e948 | 2013-10-09 09:24:27 +0300 | [diff] [blame] | 139 | ip_vs_dest_put_and_free(en->dest); |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 140 | kfree(en); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 143 | static inline void ip_vs_lblc_del(struct ip_vs_lblc_entry *en) |
| 144 | { |
| 145 | hlist_del_rcu(&en->list); |
| 146 | call_rcu(&en->rcu_head, ip_vs_lblc_rcu_free); |
| 147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
| 149 | /* |
| 150 | * Returns hash value for IPVS LBLC entry |
| 151 | */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 152 | static inline unsigned int |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 153 | ip_vs_lblc_hashkey(int af, const union nf_inet_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 155 | __be32 addr_fold = addr->ip; |
| 156 | |
| 157 | #ifdef CONFIG_IP_VS_IPV6 |
| 158 | if (af == AF_INET6) |
| 159 | addr_fold = addr->ip6[0]^addr->ip6[1]^ |
| 160 | addr->ip6[2]^addr->ip6[3]; |
| 161 | #endif |
| 162 | return (ntohl(addr_fold)*2654435761UL) & IP_VS_LBLC_TAB_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | |
| 166 | /* |
| 167 | * Hash an entry in the ip_vs_lblc_table. |
| 168 | * returns bool success. |
| 169 | */ |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 170 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | ip_vs_lblc_hash(struct ip_vs_lblc_table *tbl, struct ip_vs_lblc_entry *en) |
| 172 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 173 | unsigned int hash = ip_vs_lblc_hashkey(en->af, &en->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 175 | hlist_add_head_rcu(&en->list, &tbl->bucket[hash]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | atomic_inc(&tbl->entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 180 | /* Get ip_vs_lblc_entry associated with supplied parameters. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | static inline struct ip_vs_lblc_entry * |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 182 | ip_vs_lblc_get(int af, struct ip_vs_lblc_table *tbl, |
| 183 | const union nf_inet_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 185 | unsigned int hash = ip_vs_lblc_hashkey(af, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | struct ip_vs_lblc_entry *en; |
| 187 | |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 188 | hlist_for_each_entry_rcu(en, &tbl->bucket[hash], list) |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 189 | if (ip_vs_addr_equal(af, &en->addr, addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | return en; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | |
| 196 | /* |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 197 | * Create or update an ip_vs_lblc_entry, which is a mapping of a destination IP |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 198 | * address to a server. Called under spin lock. |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 199 | */ |
| 200 | static inline struct ip_vs_lblc_entry * |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 201 | ip_vs_lblc_new(struct ip_vs_lblc_table *tbl, const union nf_inet_addr *daddr, |
Julian Anastasov | f7fa380 | 2014-09-09 16:40:29 -0700 | [diff] [blame] | 202 | u16 af, struct ip_vs_dest *dest) |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 203 | { |
| 204 | struct ip_vs_lblc_entry *en; |
| 205 | |
Julian Anastasov | f7fa380 | 2014-09-09 16:40:29 -0700 | [diff] [blame] | 206 | en = ip_vs_lblc_get(af, tbl, daddr); |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 207 | if (en) { |
| 208 | if (en->dest == dest) |
| 209 | return en; |
| 210 | ip_vs_lblc_del(en); |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 211 | } |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 212 | en = kmalloc(sizeof(*en), GFP_ATOMIC); |
| 213 | if (!en) |
| 214 | return NULL; |
| 215 | |
Julian Anastasov | f7fa380 | 2014-09-09 16:40:29 -0700 | [diff] [blame] | 216 | en->af = af; |
| 217 | ip_vs_addr_copy(af, &en->addr, daddr); |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 218 | en->lastuse = jiffies; |
| 219 | |
| 220 | ip_vs_dest_hold(dest); |
| 221 | en->dest = dest; |
| 222 | |
| 223 | ip_vs_lblc_hash(tbl, en); |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 224 | |
| 225 | return en; |
| 226 | } |
| 227 | |
| 228 | |
| 229 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | * Flush all the entries of the specified table. |
| 231 | */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 232 | static void ip_vs_lblc_flush(struct ip_vs_service *svc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 234 | struct ip_vs_lblc_table *tbl = svc->sched_data; |
| 235 | struct ip_vs_lblc_entry *en; |
| 236 | struct hlist_node *next; |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 237 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 239 | spin_lock_bh(&svc->sched_lock); |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 240 | tbl->dead = 1; |
Tingwei Liu | 411fd52 | 2014-02-11 17:17:21 +0800 | [diff] [blame] | 241 | for (i = 0; i < IP_VS_LBLC_TAB_SIZE; i++) { |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 242 | hlist_for_each_entry_safe(en, next, &tbl->bucket[i], list) { |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 243 | ip_vs_lblc_del(en); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | atomic_dec(&tbl->entries); |
| 245 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 247 | spin_unlock_bh(&svc->sched_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Simon Horman | b27d777 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 250 | static int sysctl_lblc_expiration(struct ip_vs_service *svc) |
| 251 | { |
| 252 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 3109d2f | 2015-09-21 13:01:44 -0500 | [diff] [blame] | 253 | return svc->ipvs->sysctl_lblc_expiration; |
Simon Horman | b27d777 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 254 | #else |
| 255 | return DEFAULT_EXPIRATION; |
| 256 | #endif |
| 257 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 259 | static inline void ip_vs_lblc_full_check(struct ip_vs_service *svc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | { |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 261 | struct ip_vs_lblc_table *tbl = svc->sched_data; |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 262 | struct ip_vs_lblc_entry *en; |
| 263 | struct hlist_node *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | unsigned long now = jiffies; |
| 265 | int i, j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Tingwei Liu | 411fd52 | 2014-02-11 17:17:21 +0800 | [diff] [blame] | 267 | for (i = 0, j = tbl->rover; i < IP_VS_LBLC_TAB_SIZE; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | j = (j + 1) & IP_VS_LBLC_TAB_MASK; |
| 269 | |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 270 | spin_lock(&svc->sched_lock); |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 271 | hlist_for_each_entry_safe(en, next, &tbl->bucket[j], list) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 272 | if (time_before(now, |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 273 | en->lastuse + |
Simon Horman | b27d777 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 274 | sysctl_lblc_expiration(svc))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | continue; |
| 276 | |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 277 | ip_vs_lblc_del(en); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | atomic_dec(&tbl->entries); |
| 279 | } |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 280 | spin_unlock(&svc->sched_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | tbl->rover = j; |
| 283 | } |
| 284 | |
| 285 | |
| 286 | /* |
| 287 | * Periodical timer handler for IPVS lblc table |
| 288 | * It is used to collect stale entries when the number of entries |
| 289 | * exceeds the maximum size of the table. |
| 290 | * |
| 291 | * Fixme: we probably need more complicated algorithm to collect |
| 292 | * entries that have not been used for a long time even |
| 293 | * if the number of entries doesn't exceed the maximum size |
| 294 | * of the table. |
| 295 | * The full expiration check is for this purpose now. |
| 296 | */ |
| 297 | static void ip_vs_lblc_check_expire(unsigned long data) |
| 298 | { |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 299 | struct ip_vs_service *svc = (struct ip_vs_service *) data; |
| 300 | struct ip_vs_lblc_table *tbl = svc->sched_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | unsigned long now = jiffies; |
| 302 | int goal; |
| 303 | int i, j; |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 304 | struct ip_vs_lblc_entry *en; |
| 305 | struct hlist_node *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | if ((tbl->counter % COUNT_FOR_FULL_EXPIRATION) == 0) { |
| 308 | /* do full expiration check */ |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 309 | ip_vs_lblc_full_check(svc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | tbl->counter = 1; |
| 311 | goto out; |
| 312 | } |
| 313 | |
| 314 | if (atomic_read(&tbl->entries) <= tbl->max_size) { |
| 315 | tbl->counter++; |
| 316 | goto out; |
| 317 | } |
| 318 | |
| 319 | goal = (atomic_read(&tbl->entries) - tbl->max_size)*4/3; |
| 320 | if (goal > tbl->max_size/2) |
| 321 | goal = tbl->max_size/2; |
| 322 | |
Tingwei Liu | 411fd52 | 2014-02-11 17:17:21 +0800 | [diff] [blame] | 323 | for (i = 0, j = tbl->rover; i < IP_VS_LBLC_TAB_SIZE; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | j = (j + 1) & IP_VS_LBLC_TAB_MASK; |
| 325 | |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 326 | spin_lock(&svc->sched_lock); |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 327 | hlist_for_each_entry_safe(en, next, &tbl->bucket[j], list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | if (time_before(now, en->lastuse + ENTRY_TIMEOUT)) |
| 329 | continue; |
| 330 | |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 331 | ip_vs_lblc_del(en); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | atomic_dec(&tbl->entries); |
| 333 | goal--; |
| 334 | } |
Julian Anastasov | ba3a3ce | 2013-03-22 11:46:51 +0200 | [diff] [blame] | 335 | spin_unlock(&svc->sched_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | if (goal <= 0) |
| 337 | break; |
| 338 | } |
| 339 | tbl->rover = j; |
| 340 | |
| 341 | out: |
Tingwei Liu | 411fd52 | 2014-02-11 17:17:21 +0800 | [diff] [blame] | 342 | mod_timer(&tbl->periodic_timer, jiffies + CHECK_EXPIRE_INTERVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | |
| 346 | static int ip_vs_lblc_init_svc(struct ip_vs_service *svc) |
| 347 | { |
| 348 | int i; |
| 349 | struct ip_vs_lblc_table *tbl; |
| 350 | |
| 351 | /* |
| 352 | * Allocate the ip_vs_lblc_table for this service |
| 353 | */ |
Julian Anastasov | 748d845 | 2012-04-13 16:49:40 +0300 | [diff] [blame] | 354 | tbl = kmalloc(sizeof(*tbl), GFP_KERNEL); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 355 | if (tbl == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | return -ENOMEM; |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | svc->sched_data = tbl; |
| 359 | IP_VS_DBG(6, "LBLC hash table (memory=%Zdbytes) allocated for " |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 360 | "current service\n", sizeof(*tbl)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | /* |
| 363 | * Initialize the hash buckets |
| 364 | */ |
Tingwei Liu | 411fd52 | 2014-02-11 17:17:21 +0800 | [diff] [blame] | 365 | for (i = 0; i < IP_VS_LBLC_TAB_SIZE; i++) { |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 366 | INIT_HLIST_HEAD(&tbl->bucket[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | tbl->max_size = IP_VS_LBLC_TAB_SIZE*16; |
| 369 | tbl->rover = 0; |
| 370 | tbl->counter = 1; |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 371 | tbl->dead = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | /* |
| 374 | * Hook periodic timer for garbage collection |
| 375 | */ |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 376 | setup_timer(&tbl->periodic_timer, ip_vs_lblc_check_expire, |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 377 | (unsigned long)svc); |
| 378 | mod_timer(&tbl->periodic_timer, jiffies + CHECK_EXPIRE_INTERVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | |
Julian Anastasov | ed3ffc4 | 2013-03-22 11:46:50 +0200 | [diff] [blame] | 384 | static void ip_vs_lblc_done_svc(struct ip_vs_service *svc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | { |
| 386 | struct ip_vs_lblc_table *tbl = svc->sched_data; |
| 387 | |
| 388 | /* remove periodic timer */ |
| 389 | del_timer_sync(&tbl->periodic_timer); |
| 390 | |
| 391 | /* got to clean up table entries here */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 392 | ip_vs_lblc_flush(svc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | /* release the table itself */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 395 | kfree_rcu(tbl, rcu_head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | IP_VS_DBG(6, "LBLC hash table (memory=%Zdbytes) released\n", |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 397 | sizeof(*tbl)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | static inline struct ip_vs_dest * |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 402 | __ip_vs_lblc_schedule(struct ip_vs_service *svc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
| 404 | struct ip_vs_dest *dest, *least; |
| 405 | int loh, doh; |
| 406 | |
| 407 | /* |
Changli Gao | b552f7e | 2011-02-19 17:32:28 +0800 | [diff] [blame] | 408 | * We use the following formula to estimate the load: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | * (dest overhead) / dest->weight |
| 410 | * |
| 411 | * Remember -- no floats in kernel mode!!! |
| 412 | * The comparison of h1*w2 > h2*w1 is equivalent to that of |
| 413 | * h1/w1 > h2/w2 |
| 414 | * if every weight is larger than zero. |
| 415 | * |
| 416 | * The server with weight=0 is quiesced and will not receive any |
| 417 | * new connection. |
| 418 | */ |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 419 | list_for_each_entry_rcu(dest, &svc->destinations, n_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) |
| 421 | continue; |
| 422 | if (atomic_read(&dest->weight) > 0) { |
| 423 | least = dest; |
Changli Gao | b552f7e | 2011-02-19 17:32:28 +0800 | [diff] [blame] | 424 | loh = ip_vs_dest_conn_overhead(least); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | goto nextstage; |
| 426 | } |
| 427 | } |
| 428 | return NULL; |
| 429 | |
| 430 | /* |
| 431 | * Find the destination with the least load. |
| 432 | */ |
| 433 | nextstage: |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 434 | list_for_each_entry_continue_rcu(dest, &svc->destinations, n_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) |
| 436 | continue; |
| 437 | |
Changli Gao | b552f7e | 2011-02-19 17:32:28 +0800 | [diff] [blame] | 438 | doh = ip_vs_dest_conn_overhead(dest); |
Simon Kirby | c16526a | 2013-08-10 01:26:18 -0700 | [diff] [blame] | 439 | if ((__s64)loh * atomic_read(&dest->weight) > |
| 440 | (__s64)doh * atomic_read(&least->weight)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | least = dest; |
| 442 | loh = doh; |
| 443 | } |
| 444 | } |
| 445 | |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 446 | IP_VS_DBG_BUF(6, "LBLC: server %s:%d " |
| 447 | "activeconns %d refcnt %d weight %d overhead %d\n", |
| 448 | IP_VS_DBG_ADDR(least->af, &least->addr), |
| 449 | ntohs(least->port), |
| 450 | atomic_read(&least->activeconns), |
| 451 | atomic_read(&least->refcnt), |
| 452 | atomic_read(&least->weight), loh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
| 454 | return least; |
| 455 | } |
| 456 | |
| 457 | |
| 458 | /* |
| 459 | * If this destination server is overloaded and there is a less loaded |
| 460 | * server, then return true. |
| 461 | */ |
| 462 | static inline int |
| 463 | is_overloaded(struct ip_vs_dest *dest, struct ip_vs_service *svc) |
| 464 | { |
| 465 | if (atomic_read(&dest->activeconns) > atomic_read(&dest->weight)) { |
| 466 | struct ip_vs_dest *d; |
| 467 | |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 468 | list_for_each_entry_rcu(d, &svc->destinations, n_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | if (atomic_read(&d->activeconns)*2 |
| 470 | < atomic_read(&d->weight)) { |
| 471 | return 1; |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | |
| 479 | /* |
| 480 | * Locality-Based (weighted) Least-Connection scheduling |
| 481 | */ |
| 482 | static struct ip_vs_dest * |
Julian Anastasov | bba54de | 2013-06-16 09:09:36 +0300 | [diff] [blame] | 483 | ip_vs_lblc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb, |
| 484 | struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | { |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 486 | struct ip_vs_lblc_table *tbl = svc->sched_data; |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 487 | struct ip_vs_dest *dest = NULL; |
| 488 | struct ip_vs_lblc_entry *en; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 490 | IP_VS_DBG(6, "%s(): Scheduling...\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 492 | /* First look in our cache */ |
Julian Anastasov | bba54de | 2013-06-16 09:09:36 +0300 | [diff] [blame] | 493 | en = ip_vs_lblc_get(svc->af, tbl, &iph->daddr); |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 494 | if (en) { |
| 495 | /* We only hold a read lock, but this is atomic */ |
| 496 | en->lastuse = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 498 | /* |
| 499 | * If the destination is not available, i.e. it's in the trash, |
| 500 | * we must ignore it, as it may be removed from under our feet, |
| 501 | * if someone drops our reference count. Our caller only makes |
| 502 | * sure that destinations, that are not in the trash, are not |
| 503 | * moved to the trash, while we are scheduling. But anyone can |
| 504 | * free up entries from the trash at any time. |
| 505 | */ |
| 506 | |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 507 | dest = en->dest; |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 508 | if ((dest->flags & IP_VS_DEST_F_AVAILABLE) && |
| 509 | atomic_read(&dest->weight) > 0 && !is_overloaded(dest, svc)) |
| 510 | goto out; |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 511 | } |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 512 | |
| 513 | /* No cache entry or it is invalid, time to schedule */ |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 514 | dest = __ip_vs_lblc_schedule(svc); |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 515 | if (!dest) { |
Patrick Schaaf | 41ac51e | 2011-02-11 14:01:12 +0100 | [diff] [blame] | 516 | ip_vs_scheduler_err(svc, "no destination available"); |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 517 | return NULL; |
| 518 | } |
| 519 | |
| 520 | /* If we fail to create a cache entry, we'll just use the valid dest */ |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 521 | spin_lock_bh(&svc->sched_lock); |
Julian Anastasov | c2a4ffb | 2013-03-22 11:46:40 +0200 | [diff] [blame] | 522 | if (!tbl->dead) |
Julian Anastasov | f7fa380 | 2014-09-09 16:40:29 -0700 | [diff] [blame] | 523 | ip_vs_lblc_new(tbl, &iph->daddr, svc->af, dest); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 524 | spin_unlock_bh(&svc->sched_lock); |
Sven Wegener | 39ac50d | 2008-08-18 00:52:08 +0200 | [diff] [blame] | 525 | |
| 526 | out: |
Julius Volz | 4454837 | 2008-11-03 17:08:28 -0800 | [diff] [blame] | 527 | IP_VS_DBG_BUF(6, "LBLC: destination IP address %s --> server %s:%d\n", |
Julian Anastasov | bba54de | 2013-06-16 09:09:36 +0300 | [diff] [blame] | 528 | IP_VS_DBG_ADDR(svc->af, &iph->daddr), |
Julian Anastasov | f7fa380 | 2014-09-09 16:40:29 -0700 | [diff] [blame] | 529 | IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | return dest; |
| 532 | } |
| 533 | |
| 534 | |
| 535 | /* |
| 536 | * IPVS LBLC Scheduler structure |
| 537 | */ |
Tingwei Liu | 411fd52 | 2014-02-11 17:17:21 +0800 | [diff] [blame] | 538 | static struct ip_vs_scheduler ip_vs_lblc_scheduler = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | .name = "lblc", |
| 540 | .refcnt = ATOMIC_INIT(0), |
| 541 | .module = THIS_MODULE, |
Sven Wegener | d149ccc | 2008-08-10 09:18:02 +0000 | [diff] [blame] | 542 | .n_list = LIST_HEAD_INIT(ip_vs_lblc_scheduler.n_list), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | .init_service = ip_vs_lblc_init_svc, |
| 544 | .done_service = ip_vs_lblc_done_svc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | .schedule = ip_vs_lblc_schedule, |
| 546 | }; |
| 547 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 548 | /* |
| 549 | * per netns init. |
| 550 | */ |
Simon Horman | fb1de43 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 551 | #ifdef CONFIG_SYSCTL |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 552 | static int __net_init __ip_vs_lblc_init(struct net *net) |
| 553 | { |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 554 | struct netns_ipvs *ipvs = net_ipvs(net); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 555 | |
Hans Schillstrom | 4b984cd | 2012-04-26 09:45:34 +0200 | [diff] [blame] | 556 | if (!ipvs) |
| 557 | return -ENOENT; |
| 558 | |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 559 | if (!net_eq(net, &init_net)) { |
| 560 | ipvs->lblc_ctl_table = kmemdup(vs_vars_table, |
| 561 | sizeof(vs_vars_table), |
| 562 | GFP_KERNEL); |
| 563 | if (ipvs->lblc_ctl_table == NULL) |
Simon Horman | 0443929 | 2011-02-01 18:29:04 +0100 | [diff] [blame] | 564 | return -ENOMEM; |
Eric W. Biederman | 464dc80 | 2012-11-16 03:02:59 +0000 | [diff] [blame] | 565 | |
| 566 | /* Don't export sysctls to unprivileged users */ |
| 567 | if (net->user_ns != &init_user_ns) |
| 568 | ipvs->lblc_ctl_table[0].procname = NULL; |
| 569 | |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 570 | } else |
| 571 | ipvs->lblc_ctl_table = vs_vars_table; |
Simon Horman | b27d777 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 572 | ipvs->sysctl_lblc_expiration = DEFAULT_EXPIRATION; |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 573 | ipvs->lblc_ctl_table[0].data = &ipvs->sysctl_lblc_expiration; |
| 574 | |
| 575 | ipvs->lblc_ctl_header = |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 576 | register_net_sysctl(net, "net/ipv4/vs", ipvs->lblc_ctl_table); |
Simon Horman | 0443929 | 2011-02-01 18:29:04 +0100 | [diff] [blame] | 577 | if (!ipvs->lblc_ctl_header) { |
| 578 | if (!net_eq(net, &init_net)) |
Eric W. Biederman | e5ef39e | 2012-11-19 05:26:30 +0000 | [diff] [blame] | 579 | kfree(ipvs->lblc_ctl_table); |
Simon Horman | 0443929 | 2011-02-01 18:29:04 +0100 | [diff] [blame] | 580 | return -ENOMEM; |
| 581 | } |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 582 | |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | static void __net_exit __ip_vs_lblc_exit(struct net *net) |
| 587 | { |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 588 | struct netns_ipvs *ipvs = net_ipvs(net); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 589 | |
Hans Schillstrom | b6e885d | 2011-01-03 14:44:45 +0100 | [diff] [blame] | 590 | unregister_net_sysctl_table(ipvs->lblc_ctl_header); |
| 591 | |
| 592 | if (!net_eq(net, &init_net)) |
| 593 | kfree(ipvs->lblc_ctl_table); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 594 | } |
| 595 | |
Simon Horman | fb1de43 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 596 | #else |
| 597 | |
| 598 | static int __net_init __ip_vs_lblc_init(struct net *net) { return 0; } |
| 599 | static void __net_exit __ip_vs_lblc_exit(struct net *net) { } |
| 600 | |
| 601 | #endif |
| 602 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 603 | static struct pernet_operations ip_vs_lblc_ops = { |
| 604 | .init = __ip_vs_lblc_init, |
| 605 | .exit = __ip_vs_lblc_exit, |
| 606 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | static int __init ip_vs_lblc_init(void) |
| 609 | { |
Pavel Emelyanov | a014bc8 | 2007-12-04 00:43:24 -0800 | [diff] [blame] | 610 | int ret; |
| 611 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 612 | ret = register_pernet_subsys(&ip_vs_lblc_ops); |
| 613 | if (ret) |
| 614 | return ret; |
| 615 | |
Pavel Emelyanov | a014bc8 | 2007-12-04 00:43:24 -0800 | [diff] [blame] | 616 | ret = register_ip_vs_scheduler(&ip_vs_lblc_scheduler); |
| 617 | if (ret) |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 618 | unregister_pernet_subsys(&ip_vs_lblc_ops); |
Pavel Emelyanov | a014bc8 | 2007-12-04 00:43:24 -0800 | [diff] [blame] | 619 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | } |
| 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | static void __exit ip_vs_lblc_cleanup(void) |
| 623 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | unregister_ip_vs_scheduler(&ip_vs_lblc_scheduler); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 625 | unregister_pernet_subsys(&ip_vs_lblc_ops); |
Julian Anastasov | 2f3d771 | 2013-09-12 11:21:08 +0300 | [diff] [blame] | 626 | rcu_barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | |
| 630 | module_init(ip_vs_lblc_init); |
| 631 | module_exit(ip_vs_lblc_cleanup); |
| 632 | MODULE_LICENSE("GPL"); |