Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 1 | #define KMSG_COMPONENT "IPVS" |
| 2 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 3 | |
| 4 | #include <linux/module.h> |
| 5 | #include <linux/spinlock.h> |
| 6 | #include <linux/interrupt.h> |
| 7 | #include <asm/string.h> |
| 8 | #include <linux/kmod.h> |
| 9 | #include <linux/sysctl.h> |
| 10 | |
| 11 | #include <net/ip_vs.h> |
| 12 | |
| 13 | /* IPVS pe list */ |
| 14 | static LIST_HEAD(ip_vs_pe); |
| 15 | |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 16 | /* semaphore for IPVS PEs. */ |
| 17 | static DEFINE_MUTEX(ip_vs_pe_mutex); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 18 | |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 19 | /* Get pe in the pe list by name */ |
Hans Schillstrom | fe5e7a1 | 2010-11-19 14:25:12 +0100 | [diff] [blame] | 20 | struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name) |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 21 | { |
| 22 | struct ip_vs_pe *pe; |
| 23 | |
Hans Schillstrom | fe5e7a1 | 2010-11-19 14:25:12 +0100 | [diff] [blame] | 24 | IP_VS_DBG(10, "%s(): pe_name \"%s\"\n", __func__, |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 25 | pe_name); |
| 26 | |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 27 | rcu_read_lock(); |
| 28 | list_for_each_entry_rcu(pe, &ip_vs_pe, n_list) { |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 29 | /* Test and get the modules atomically */ |
| 30 | if (pe->module && |
| 31 | !try_module_get(pe->module)) { |
| 32 | /* This pe is just deleted */ |
| 33 | continue; |
| 34 | } |
| 35 | if (strcmp(pe_name, pe->name)==0) { |
| 36 | /* HIT */ |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 37 | rcu_read_unlock(); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 38 | return pe; |
| 39 | } |
Markus Elfring | 982f405 | 2014-11-18 20:37:05 +0100 | [diff] [blame] | 40 | module_put(pe->module); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 41 | } |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 42 | rcu_read_unlock(); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 43 | |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 44 | return NULL; |
| 45 | } |
| 46 | |
| 47 | /* Lookup pe and try to load it if it doesn't exist */ |
Simon Horman | e9e5eee | 2010-11-08 20:05:57 +0900 | [diff] [blame] | 48 | struct ip_vs_pe *ip_vs_pe_getbyname(const char *name) |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 49 | { |
| 50 | struct ip_vs_pe *pe; |
| 51 | |
| 52 | /* Search for the pe by name */ |
Simon Horman | e9e5eee | 2010-11-08 20:05:57 +0900 | [diff] [blame] | 53 | pe = __ip_vs_pe_getbyname(name); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 54 | |
| 55 | /* If pe not found, load the module and search again */ |
| 56 | if (!pe) { |
| 57 | request_module("ip_vs_pe_%s", name); |
Simon Horman | e9e5eee | 2010-11-08 20:05:57 +0900 | [diff] [blame] | 58 | pe = __ip_vs_pe_getbyname(name); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | return pe; |
| 62 | } |
| 63 | |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 64 | /* Register a pe in the pe list */ |
| 65 | int register_ip_vs_pe(struct ip_vs_pe *pe) |
| 66 | { |
| 67 | struct ip_vs_pe *tmp; |
| 68 | |
| 69 | /* increase the module use count */ |
| 70 | ip_vs_use_count_inc(); |
| 71 | |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 72 | mutex_lock(&ip_vs_pe_mutex); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 73 | /* Make sure that the pe with this name doesn't exist |
| 74 | * in the pe list. |
| 75 | */ |
| 76 | list_for_each_entry(tmp, &ip_vs_pe, n_list) { |
| 77 | if (strcmp(tmp->name, pe->name) == 0) { |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 78 | mutex_unlock(&ip_vs_pe_mutex); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 79 | ip_vs_use_count_dec(); |
| 80 | pr_err("%s(): [%s] pe already existed " |
| 81 | "in the system\n", __func__, pe->name); |
| 82 | return -EINVAL; |
| 83 | } |
| 84 | } |
| 85 | /* Add it into the d-linked pe list */ |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 86 | list_add_rcu(&pe->n_list, &ip_vs_pe); |
| 87 | mutex_unlock(&ip_vs_pe_mutex); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 88 | |
| 89 | pr_info("[%s] pe registered.\n", pe->name); |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | EXPORT_SYMBOL_GPL(register_ip_vs_pe); |
| 94 | |
| 95 | /* Unregister a pe from the pe list */ |
| 96 | int unregister_ip_vs_pe(struct ip_vs_pe *pe) |
| 97 | { |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 98 | mutex_lock(&ip_vs_pe_mutex); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 99 | /* Remove it from the d-linked pe list */ |
Julian Anastasov | 60b6aa3 | 2013-03-21 11:58:09 +0200 | [diff] [blame] | 100 | list_del_rcu(&pe->n_list); |
| 101 | mutex_unlock(&ip_vs_pe_mutex); |
Simon Horman | 8be67a6 | 2010-08-22 21:37:54 +0900 | [diff] [blame] | 102 | |
| 103 | /* decrease the module use count */ |
| 104 | ip_vs_use_count_dec(); |
| 105 | |
| 106 | pr_info("[%s] pe unregistered.\n", pe->name); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | EXPORT_SYMBOL_GPL(unregister_ip_vs_pe); |