From 8be67a6617b3403551fccb67b1c624c659419515 Mon Sep 17 00:00:00 2001 From: Simon Horman Date: Sun, 22 Aug 2010 21:37:54 +0900 Subject: IPVS: management of persistence engine modules This is based heavily on the scheduler management code Signed-off-by: Simon Horman Acked-by: Julian Anastasov --- net/netfilter/ipvs/Makefile | 2 +- net/netfilter/ipvs/ip_vs_pe.c | 147 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 148 insertions(+), 1 deletion(-) create mode 100644 net/netfilter/ipvs/ip_vs_pe.c (limited to 'net/netfilter') diff --git a/net/netfilter/ipvs/Makefile b/net/netfilter/ipvs/Makefile index 349fe8819b89..4a87bf3c6293 100644 --- a/net/netfilter/ipvs/Makefile +++ b/net/netfilter/ipvs/Makefile @@ -14,7 +14,7 @@ ip_vs-extra_objs-$(CONFIG_IP_VS_NFCT) += ip_vs_nfct.o ip_vs-objs := ip_vs_conn.o ip_vs_core.o ip_vs_ctl.o ip_vs_sched.o \ ip_vs_xmit.o ip_vs_app.o ip_vs_sync.o \ - ip_vs_est.o ip_vs_proto.o \ + ip_vs_est.o ip_vs_proto.o ip_vs_pe.o \ $(ip_vs_proto-objs-y) $(ip_vs-extra_objs-y) diff --git a/net/netfilter/ipvs/ip_vs_pe.c b/net/netfilter/ipvs/ip_vs_pe.c new file mode 100644 index 000000000000..3414af70ee12 --- /dev/null +++ b/net/netfilter/ipvs/ip_vs_pe.c @@ -0,0 +1,147 @@ +#define KMSG_COMPONENT "IPVS" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include + +#include + +/* IPVS pe list */ +static LIST_HEAD(ip_vs_pe); + +/* lock for service table */ +static DEFINE_SPINLOCK(ip_vs_pe_lock); + +/* Bind a service with a pe */ +void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe) +{ + svc->pe = pe; +} + +/* Unbind a service from its pe */ +void ip_vs_unbind_pe(struct ip_vs_service *svc) +{ + svc->pe = NULL; +} + +/* Get pe in the pe list by name */ +static struct ip_vs_pe * +ip_vs_pe_getbyname(const char *pe_name) +{ + struct ip_vs_pe *pe; + + IP_VS_DBG(2, "%s(): pe_name \"%s\"\n", __func__, + pe_name); + + spin_lock_bh(&ip_vs_pe_lock); + + list_for_each_entry(pe, &ip_vs_pe, n_list) { + /* Test and get the modules atomically */ + if (pe->module && + !try_module_get(pe->module)) { + /* This pe is just deleted */ + continue; + } + if (strcmp(pe_name, pe->name)==0) { + /* HIT */ + spin_unlock_bh(&ip_vs_pe_lock); + return pe; + } + if (pe->module) + module_put(pe->module); + } + + spin_unlock_bh(&ip_vs_pe_lock); + return NULL; +} + +/* Lookup pe and try to load it if it doesn't exist */ +struct ip_vs_pe *ip_vs_pe_get(const char *name) +{ + struct ip_vs_pe *pe; + + /* Search for the pe by name */ + pe = ip_vs_pe_getbyname(name); + + /* If pe not found, load the module and search again */ + if (!pe) { + request_module("ip_vs_pe_%s", name); + pe = ip_vs_pe_getbyname(name); + } + + return pe; +} + +void ip_vs_pe_put(struct ip_vs_pe *pe) +{ + if (pe && pe->module) + module_put(pe->module); +} + +/* Register a pe in the pe list */ +int register_ip_vs_pe(struct ip_vs_pe *pe) +{ + struct ip_vs_pe *tmp; + + /* increase the module use count */ + ip_vs_use_count_inc(); + + spin_lock_bh(&ip_vs_pe_lock); + + if (!list_empty(&pe->n_list)) { + spin_unlock_bh(&ip_vs_pe_lock); + ip_vs_use_count_dec(); + pr_err("%s(): [%s] pe already linked\n", + __func__, pe->name); + return -EINVAL; + } + + /* Make sure that the pe with this name doesn't exist + * in the pe list. + */ + list_for_each_entry(tmp, &ip_vs_pe, n_list) { + if (strcmp(tmp->name, pe->name) == 0) { + spin_unlock_bh(&ip_vs_pe_lock); + ip_vs_use_count_dec(); + pr_err("%s(): [%s] pe already existed " + "in the system\n", __func__, pe->name); + return -EINVAL; + } + } + /* Add it into the d-linked pe list */ + list_add(&pe->n_list, &ip_vs_pe); + spin_unlock_bh(&ip_vs_pe_lock); + + pr_info("[%s] pe registered.\n", pe->name); + + return 0; +} +EXPORT_SYMBOL_GPL(register_ip_vs_pe); + +/* Unregister a pe from the pe list */ +int unregister_ip_vs_pe(struct ip_vs_pe *pe) +{ + spin_lock_bh(&ip_vs_pe_lock); + if (list_empty(&pe->n_list)) { + spin_unlock_bh(&ip_vs_pe_lock); + pr_err("%s(): [%s] pe is not in the list. failed\n", + __func__, pe->name); + return -EINVAL; + } + + /* Remove it from the d-linked pe list */ + list_del(&pe->n_list); + spin_unlock_bh(&ip_vs_pe_lock); + + /* decrease the module use count */ + ip_vs_use_count_dec(); + + pr_info("[%s] pe unregistered.\n", pe->name); + + return 0; +} +EXPORT_SYMBOL_GPL(unregister_ip_vs_pe); -- cgit v1.2.3