[NETNS]: Namespacing IPv4 fib rules.

The final trick for rules: place fib4_rules_ops into struct net and
modify initialization path for this.

Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 61a28ff..a7bd5d8 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -4,8 +4,10 @@
 
 #ifndef __NETNS_IPV4_H__
 #define __NETNS_IPV4_H__
+
 struct ctl_table_header;
 struct ipv4_devconf;
+struct fib_rules_ops;
 
 struct netns_ipv4 {
 #ifdef CONFIG_SYSCTL
@@ -13,5 +15,8 @@ struct netns_ipv4 {
 #endif
        struct ipv4_devconf     *devconf_all;
        struct ipv4_devconf     *devconf_dflt;
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+       struct fib_rules_ops    *rules_ops;
+#endif
 };
 #endif

diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 49819fe..72232ab 100644 (file)
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -32,8 +32,6 @@
 #include <net/ip_fib.h>
 #include <net/fib_rules.h>
 
-static struct fib_rules_ops fib4_rules_ops;
-
 struct fib4_rule
 {
        struct fib_rule         common;
@@ -63,7 +61,7 @@ int fib_lookup(struct flowi *flp, struct fib_result *res)
        };
        int err;
 
-       err = fib_rules_lookup(&fib4_rules_ops, flp, 0, &arg);
+       err = fib_rules_lookup(init_net.ipv4.rules_ops, flp, 0, &arg);
        res->r = arg.rule;
 
        return err;
@@ -149,6 +147,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
                               struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
                               struct nlattr **tb)
 {
+       struct net *net = skb->sk->sk_net;
        int err = -EINVAL;
        struct fib4_rule *rule4 = (struct fib4_rule *) rule;
 
@@ -159,7 +158,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
                if (rule->action == FR_ACT_TO_TBL) {
                        struct fib_table *table;
 
-                       table = fib_empty_table(&init_net);
+                       table = fib_empty_table(net);
                        if (table == NULL) {
                                err = -ENOBUFS;
                                goto errout;
@@ -250,9 +249,9 @@ static u32 fib4_rule_default_pref(struct fib_rules_ops *ops)
        struct list_head *pos;
        struct fib_rule *rule;
 
-       if (!list_empty(&fib4_rules_ops.rules_list)) {
-               pos = fib4_rules_ops.rules_list.next;
-               if (pos->next != &fib4_rules_ops.rules_list) {
+       if (!list_empty(&ops->rules_list)) {
+               pos = ops->rules_list.next;
+               if (pos->next != &ops->rules_list) {
                        rule = list_entry(pos->next, struct fib_rule, list);
                        if (rule->pref)
                                return rule->pref - 1;
@@ -274,7 +273,7 @@ static void fib4_rule_flush_cache(void)
        rt_cache_flush(-1);
 }
 
-static struct fib_rules_ops fib4_rules_ops = {
+static struct fib_rules_ops fib4_rules_ops_template = {
        .family         = AF_INET,
        .rule_size      = sizeof(struct fib4_rule),
        .addr_size      = sizeof(u32),
@@ -288,24 +287,20 @@ static struct fib_rules_ops fib4_rules_ops = {
        .flush_cache    = fib4_rule_flush_cache,
        .nlgroup        = RTNLGRP_IPV4_RULE,
        .policy         = fib4_rule_policy,
-       .rules_list     = LIST_HEAD_INIT(fib4_rules_ops.rules_list),
        .owner          = THIS_MODULE,
 };
 
-static int __init fib_default_rules_init(void)
+static int fib_default_rules_init(struct fib_rules_ops *ops)
 {
        int err;
 
-       err = fib_default_rule_add(&fib4_rules_ops, 0,
-                                  RT_TABLE_LOCAL, FIB_RULE_PERMANENT);
+       err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, FIB_RULE_PERMANENT);
        if (err < 0)
                return err;
-       err = fib_default_rule_add(&fib4_rules_ops, 0x7FFE,
-                                  RT_TABLE_MAIN, 0);
+       err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
        if (err < 0)
                return err;
-       err = fib_default_rule_add(&fib4_rules_ops, 0x7FFF,
-                                  RT_TABLE_DEFAULT, 0);
+       err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
        if (err < 0)
                return err;
        return 0;
@@ -314,20 +309,29 @@ static int __init fib_default_rules_init(void)
 int __net_init fib4_rules_init(struct net *net)
 {
        int err;
+       struct fib_rules_ops *ops;
+
+       ops = kmemdup(&fib4_rules_ops_template, sizeof(*ops), GFP_KERNEL);
+       if (ops == NULL)
+               return -ENOMEM;
+       INIT_LIST_HEAD(&ops->rules_list);
+       fib_rules_register(net, ops);
 
-       fib_rules_register(net, &fib4_rules_ops);
-       err = fib_default_rules_init();
+       err = fib_default_rules_init(ops);
        if (err < 0)
                goto fail;
+       net->ipv4.rules_ops = ops;
        return 0;
 
 fail:
        /* also cleans all rules already added */
-       fib_rules_unregister(net, &fib4_rules_ops);
+       fib_rules_unregister(net, ops);
+       kfree(ops);
        return err;
 }
 
 void __net_exit fib4_rules_exit(struct net *net)
 {
-       fib_rules_unregister(net, &fib4_rules_ops);
+       fib_rules_unregister(net, net->ipv4.rules_ops);
+       kfree(net->ipv4.rules_ops);
 }