[PATCH 2/5] ipvs: generalize app registration in netns

[Simon Horman <horms@xxxxxxxxxxxx>]

From: Julian Anastasov <ja@xxxxxx>

        Get rid of the ftp_app pointer and allow applications
to be registered without adding fields in the netns_ipvs structure.

v2: fix coding style as suggested by Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>

Signed-off-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 include/net/ip_vs.h            |  5 ++--
 net/netfilter/ipvs/ip_vs_app.c | 58 ++++++++++++++++++++++++++++++------------
 net/netfilter/ipvs/ip_vs_ftp.c | 21 ++++-----------
 3 files changed, 49 insertions(+), 35 deletions(-)

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 95374d1..4b8f18f 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -808,8 +808,6 @@ struct netns_ipvs {
        struct list_head        rs_table[IP_VS_RTAB_SIZE];
        /* ip_vs_app */
        struct list_head        app_list;
-       /* ip_vs_ftp */
-       struct ip_vs_app        *ftp_app;
        /* ip_vs_proto */
        #define IP_VS_PROTO_TAB_SIZE    32      /* must be power of 2 */
        struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
@@ -1179,7 +1177,8 @@ extern void ip_vs_service_net_cleanup(struct net *net);
  *      (from ip_vs_app.c)
  */
 #define IP_VS_APP_MAX_PORTS  8
-extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
+extern struct ip_vs_app *register_ip_vs_app(struct net *net,
+                                           struct ip_vs_app *app);
 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
index 64f9e8f..9713e6e 100644
--- a/net/netfilter/ipvs/ip_vs_app.c
+++ b/net/netfilter/ipvs/ip_vs_app.c
@@ -180,22 +180,38 @@ register_ip_vs_app_inc(struct net *net, struct ip_vs_app 
*app, __u16 proto,
 }
 
 
-/*
- *     ip_vs_app registration routine
- */
-int register_ip_vs_app(struct net *net, struct ip_vs_app *app)
+/* Register application for netns */
+struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app)
 {
        struct netns_ipvs *ipvs = net_ipvs(net);
-       /* increase the module use count */
-       ip_vs_use_count_inc();
+       struct ip_vs_app *a;
+       int err = 0;
+
+       if (!ipvs)
+               return ERR_PTR(-ENOENT);
 
        mutex_lock(&__ip_vs_app_mutex);
 
-       list_add(&app->a_list, &ipvs->app_list);
+       list_for_each_entry(a, &ipvs->app_list, a_list) {
+               if (!strcmp(app->name, a->name)) {
+                       err = -EEXIST;
+                       goto out_unlock;
+               }
+       }
+       a = kmemdup(app, sizeof(*app), GFP_KERNEL);
+       if (!a) {
+               err = -ENOMEM;
+               goto out_unlock;
+       }
+       INIT_LIST_HEAD(&a->incs_list);
+       list_add(&a->a_list, &ipvs->app_list);
+       /* increase the module use count */
+       ip_vs_use_count_inc();
 
+out_unlock:
        mutex_unlock(&__ip_vs_app_mutex);
 
-       return 0;
+       return err ? ERR_PTR(err) : a;
 }
 
 
@@ -205,20 +221,29 @@ int register_ip_vs_app(struct net *net, struct ip_vs_app 
*app)
  */
 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app)
 {
-       struct ip_vs_app *inc, *nxt;
+       struct netns_ipvs *ipvs = net_ipvs(net);
+       struct ip_vs_app *a, *anxt, *inc, *nxt;
+
+       if (!ipvs)
+               return;
 
        mutex_lock(&__ip_vs_app_mutex);
 
-       list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) {
-               ip_vs_app_inc_release(net, inc);
-       }
+       list_for_each_entry_safe(a, anxt, &ipvs->app_list, a_list) {
+               if (app && strcmp(app->name, a->name))
+                       continue;
+               list_for_each_entry_safe(inc, nxt, &a->incs_list, a_list) {
+                       ip_vs_app_inc_release(net, inc);
+               }
 
-       list_del(&app->a_list);
+               list_del(&a->a_list);
+               kfree(a);
 
-       mutex_unlock(&__ip_vs_app_mutex);
+               /* decrease the module use count */
+               ip_vs_use_count_dec();
+       }
 
-       /* decrease the module use count */
-       ip_vs_use_count_dec();
+       mutex_unlock(&__ip_vs_app_mutex);
 }
 
 
@@ -586,5 +611,6 @@ int __net_init ip_vs_app_net_init(struct net *net)
 
 void __net_exit ip_vs_app_net_cleanup(struct net *net)
 {
+       unregister_ip_vs_app(net, NULL /* all */);
        proc_net_remove(net, "ip_vs_app");
 }
diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index b20b29c..ad70b7e 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -441,16 +441,10 @@ static int __net_init __ip_vs_ftp_init(struct net *net)
 
        if (!ipvs)
                return -ENOENT;
-       app = kmemdup(&ip_vs_ftp, sizeof(struct ip_vs_app), GFP_KERNEL);
-       if (!app)
-               return -ENOMEM;
-       INIT_LIST_HEAD(&app->a_list);
-       INIT_LIST_HEAD(&app->incs_list);
-       ipvs->ftp_app = app;
 
-       ret = register_ip_vs_app(net, app);
-       if (ret)
-               goto err_exit;
+       app = register_ip_vs_app(net, &ip_vs_ftp);
+       if (IS_ERR(app))
+               return PTR_ERR(app);
 
        for (i = 0; i < ports_count; i++) {
                if (!ports[i])
@@ -464,9 +458,7 @@ static int __net_init __ip_vs_ftp_init(struct net *net)
        return 0;
 
 err_unreg:
-       unregister_ip_vs_app(net, app);
-err_exit:
-       kfree(ipvs->ftp_app);
+       unregister_ip_vs_app(net, &ip_vs_ftp);
        return ret;
 }
 /*
@@ -474,10 +466,7 @@ err_exit:
  */
 static void __ip_vs_ftp_exit(struct net *net)
 {
-       struct netns_ipvs *ipvs = net_ipvs(net);
-
-       unregister_ip_vs_app(net, ipvs->ftp_app);
-       kfree(ipvs->ftp_app);
+       unregister_ip_vs_app(net, &ip_vs_ftp);
 }
 
 static struct pernet_operations ip_vs_ftp_ops = {
-- 
1.7.10.2.484.gcd07cc5

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