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Date: Thu, 21 Oct 2010 17:19:10 +0200
From: kaber@...sh.net
To: davem@...emloft.net
Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 23/72] IPVS: management of persistence engine modules
From: Simon Horman <horms@...ge.net.au>
This is based heavily on the scheduler management code
Signed-off-by: Simon Horman <horms@...ge.net.au>
Acked-by: Julian Anastasov <ja@....bg>
---
include/net/ip_vs.h | 6 ++
net/netfilter/ipvs/Makefile | 2 +-
net/netfilter/ipvs/ip_vs_pe.c | 147 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 154 insertions(+), 1 deletions(-)
create mode 100644 net/netfilter/ipvs/ip_vs_pe.c
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 974daf5..a6b93a2 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -796,6 +796,12 @@ extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
extern int ip_vs_app_init(void);
extern void ip_vs_app_cleanup(void);
+void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
+void ip_vs_unbind_pe(struct ip_vs_service *svc);
+int register_ip_vs_pe(struct ip_vs_pe *pe);
+int unregister_ip_vs_pe(struct ip_vs_pe *pe);
+extern struct ip_vs_pe *ip_vs_pe_get(const char *name);
+extern void ip_vs_pe_put(struct ip_vs_pe *pe);
/*
* IPVS protocol functions (from ip_vs_proto.c)
diff --git a/net/netfilter/ipvs/Makefile b/net/netfilter/ipvs/Makefile
index 349fe88..4a87bf3 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 0000000..3414af7
--- /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 <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <asm/string.h>
+#include <linux/kmod.h>
+#include <linux/sysctl.h>
+
+#include <net/ip_vs.h>
+
+/* 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);
--
1.7.1
--
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