[NETNS][IPV6] fib6 rule - dynamic allocation of the rules struct ops

The fib6_rules_ops structure is dynamically allocated, so that allows
to make several instances of it per network namespace.

The global static fib6_rules_ops structure is renamed to
fib6_rules_ops_template in order to quickly memcopy it for the
structure initialization.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 9 deletions

diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 03ad23a5fd3c..60af08f12547 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -29,7 +29,7 @@ struct fib6_rule
         u8                      tclass;
 };
 
-static struct fib_rules_ops fib6_rules_ops;
+static struct fib_rules_ops *fib6_rules_ops;
 
 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl,
                                    int flags, pol_lookup_t lookup)
@@ -38,7 +38,7 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl,
                 .lookup_ptr = lookup,
         };
 
-        fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
+        fib_rules_lookup(fib6_rules_ops, fl, flags, &arg);
         if (arg.rule)
                 fib_rule_put(arg.rule);
 
@@ -234,7 +234,7 @@ static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
                + nla_total_size(16); /* src */
 }
 
-static struct fib_rules_ops fib6_rules_ops = {
+static struct fib_rules_ops fib6_rules_ops_template = {
         .family                 = AF_INET6,
         .rule_size              = sizeof(struct fib6_rule),
         .addr_size              = sizeof(struct in6_addr),
@@ -247,7 +247,6 @@ static struct fib_rules_ops fib6_rules_ops = {
         .nlmsg_payload          = fib6_rule_nlmsg_payload,
         .nlgroup                = RTNLGRP_IPV6_RULE,
         .policy                 = fib6_rule_policy,
-        .rules_list             = LIST_HEAD_INIT(fib6_rules_ops.rules_list),
         .owner                  = THIS_MODULE,
         .fro_net                = &init_net,
 };
@@ -256,11 +255,18 @@ static int __init fib6_default_rules_init(void)
 {
         int err;
 
-        err = fib_default_rule_add(&fib6_rules_ops, 0,
+        fib6_rules_ops = kmemdup(&fib6_rules_ops_template,
+                                 sizeof(*fib6_rules_ops), GFP_KERNEL);
+        if (!fib6_rules_ops)
+                return -ENOMEM;
+
+        INIT_LIST_HEAD(&fib6_rules_ops->rules_list);
+
+        err = fib_default_rule_add(fib6_rules_ops, 0,
                                    RT6_TABLE_LOCAL, FIB_RULE_PERMANENT);
         if (err < 0)
                 return err;
-        err = fib_default_rule_add(&fib6_rules_ops, 0x7FFE, RT6_TABLE_MAIN, 0);
+        err = fib_default_rule_add(fib6_rules_ops, 0x7FFE, RT6_TABLE_MAIN, 0);
         if (err < 0)
                 return err;
         return 0;
@@ -274,18 +280,20 @@ int __init fib6_rules_init(void)
         if (ret)
                 goto out;
 
-        ret = fib_rules_register(&fib6_rules_ops);
+        ret = fib_rules_register(fib6_rules_ops);
         if (ret)
                 goto out_default_rules_init;
 out:
         return ret;
 
 out_default_rules_init:
-        fib_rules_cleanup_ops(&fib6_rules_ops);
+        fib_rules_cleanup_ops(fib6_rules_ops);
+        kfree(fib6_rules_ops);
         goto out;
 }
 
 void fib6_rules_cleanup(void)
 {
-        fib_rules_unregister(&fib6_rules_ops);
+        fib_rules_unregister(fib6_rules_ops);
+        kfree(fib6_rules_ops);
 }