IPVS: netns, prepare protocol

Add support for protocol data per name-space.
in struct ip_vs_protocol, appcnt will be removed when all protos
are modified for network name-space.

This patch causes warnings of unused functions, they will be used
when next patch will be applied.

Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

3 files changed, 88 insertions, 1 deletions

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index d551e0d8fd9a..88d4e40b538a 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -352,6 +352,7 @@ struct iphdr;
 struct ip_vs_conn;
 struct ip_vs_app;
 struct sk_buff;
+struct ip_vs_proto_data;
 
 struct ip_vs_protocol {
         struct ip_vs_protocol   *next;
@@ -366,6 +367,10 @@ struct ip_vs_protocol {
 
         void (*exit)(struct ip_vs_protocol *pp);
 
+        void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
+
+        void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
+
         int (*conn_schedule)(int af, struct sk_buff *skb,
                              struct ip_vs_protocol *pp,
                              int *verdict, struct ip_vs_conn **cpp);
@@ -417,7 +422,20 @@ struct ip_vs_protocol {
         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
 };
 
-extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
+/*
+ * protocol data per netns
+ */
+struct ip_vs_proto_data {
+        struct ip_vs_proto_data *next;
+        struct ip_vs_protocol   *pp;
+        int                     *timeout_table; /* protocol timeout table */
+        atomic_t                appcnt;         /* counter of proto app incs. */
+        struct tcp_states_t     *tcp_state_table;
+};
+
+extern struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
+extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
+                                                     unsigned short proto);
 
 struct ip_vs_conn_param {
         const union nf_inet_addr        *caddr;
diff --git a/include/net/netns/ip_vs.h b/include/net/netns/ip_vs.h
index d14581cc4fe0..6f4e089b8db2 100644
--- a/include/net/netns/ip_vs.h
+++ b/include/net/netns/ip_vs.h
@@ -28,6 +28,9 @@ struct netns_ipvs {
         #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
 
         struct list_head        rs_table[IP_VS_RTAB_SIZE];
+        /* 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];
 
         /* ip_vs_lblc */
         int                     sysctl_lblc_expiration;
diff --git a/net/netfilter/ipvs/ip_vs_proto.c b/net/netfilter/ipvs/ip_vs_proto.c
index 45392942d0e7..576e29648c53 100644
--- a/net/netfilter/ipvs/ip_vs_proto.c
+++ b/net/netfilter/ipvs/ip_vs_proto.c
@@ -60,6 +60,31 @@ static int __used __init register_ip_vs_protocol(struct ip_vs_protocol *pp)
         return 0;
 }
 
+/*
+ *      register an ipvs protocols netns related data
+ */
+static int
+register_ip_vs_proto_netns(struct net *net, struct ip_vs_protocol *pp)
+{
+        struct netns_ipvs *ipvs = net_ipvs(net);
+        unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
+        struct ip_vs_proto_data *pd =
+                        kzalloc(sizeof(struct ip_vs_proto_data), GFP_ATOMIC);
+
+        if (!pd) {
+                pr_err("%s(): no memory.\n", __func__);
+                return -ENOMEM;
+        }
+        pd->pp = pp;    /* For speed issues */
+        pd->next = ipvs->proto_data_table[hash];
+        ipvs->proto_data_table[hash] = pd;
+        atomic_set(&pd->appcnt, 0);     /* Init app counter */
+
+        if (pp->init_netns != NULL)
+                pp->init_netns(net, pd);
+
+        return 0;
+}
 
 /*
  *      unregister an ipvs protocol
@@ -82,6 +107,29 @@ static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
         return -ESRCH;
 }
 
+/*
+ *      unregister an ipvs protocols netns data
+ */
+static int
+unregister_ip_vs_proto_netns(struct net *net, struct ip_vs_proto_data *pd)
+{
+        struct netns_ipvs *ipvs = net_ipvs(net);
+        struct ip_vs_proto_data **pd_p;
+        unsigned hash = IP_VS_PROTO_HASH(pd->pp->protocol);
+
+        pd_p = &ipvs->proto_data_table[hash];
+        for (; *pd_p; pd_p = &(*pd_p)->next) {
+                if (*pd_p == pd) {
+                        *pd_p = pd->next;
+                        if (pd->pp->exit_netns != NULL)
+                                pd->pp->exit_netns(net, pd);
+                        kfree(pd);
+                        return 0;
+                }
+        }
+
+        return -ESRCH;
+}
 
 /*
  *      get ip_vs_protocol object by its proto.
@@ -100,6 +148,24 @@ struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
 }
 EXPORT_SYMBOL(ip_vs_proto_get);
 
+/*
+ *      get ip_vs_protocol object data by netns and proto
+ */
+struct ip_vs_proto_data *
+ip_vs_proto_data_get(struct net *net, unsigned short proto)
+{
+        struct netns_ipvs *ipvs = net_ipvs(net);
+        struct ip_vs_proto_data *pd;
+        unsigned hash = IP_VS_PROTO_HASH(proto);
+
+        for (pd = ipvs->proto_data_table[hash]; pd; pd = pd->next) {
+                if (pd->pp->protocol == proto)
+                        return pd;
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL(ip_vs_proto_data_get);
 
 /*
  *      Propagate event for state change to all protocols