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TOMOYO Linux Cross Reference
Linux/net/netfilter/ipvs/ip_vs_pe.c

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  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 
 16 /* semaphore for IPVS PEs. */
 17 static DEFINE_MUTEX(ip_vs_pe_mutex);
 18 
 19 /* Get pe in the pe list by name */
 20 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name)
 21 {
 22         struct ip_vs_pe *pe;
 23 
 24         IP_VS_DBG(10, "%s(): pe_name \"%s\"\n", __func__,
 25                   pe_name);
 26 
 27         rcu_read_lock();
 28         list_for_each_entry_rcu(pe, &ip_vs_pe, n_list) {
 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 */
 37                         rcu_read_unlock();
 38                         return pe;
 39                 }
 40                 module_put(pe->module);
 41         }
 42         rcu_read_unlock();
 43 
 44         return NULL;
 45 }
 46 
 47 /* Lookup pe and try to load it if it doesn't exist */
 48 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name)
 49 {
 50         struct ip_vs_pe *pe;
 51 
 52         /* Search for the pe by name */
 53         pe = __ip_vs_pe_getbyname(name);
 54 
 55         /* If pe not found, load the module and search again */
 56         if (!pe) {
 57                 request_module("ip_vs_pe_%s", name);
 58                 pe = __ip_vs_pe_getbyname(name);
 59         }
 60 
 61         return pe;
 62 }
 63 
 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 
 72         mutex_lock(&ip_vs_pe_mutex);
 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) {
 78                         mutex_unlock(&ip_vs_pe_mutex);
 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 */
 86         list_add_rcu(&pe->n_list, &ip_vs_pe);
 87         mutex_unlock(&ip_vs_pe_mutex);
 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 {
 98         mutex_lock(&ip_vs_pe_mutex);
 99         /* Remove it from the d-linked pe list */
100         list_del_rcu(&pe->n_list);
101         mutex_unlock(&ip_vs_pe_mutex);
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);
111 

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