net: fib_rules: mark arguments to fib_rules_register const and __net_initdata

fib_rules_register() duplicates the template passed to it without modification,
mark the argument as const. Additionally the templates are only needed when
instantiating a new namespace, so mark them as __net_initdata, which means
they can be discarded when CONFIG_NET_NS=n.

Signed-off-by: Patrick McHardy <kaber@trash.net>

include/net/fib_rules.h

@@ -104,7 +104,7 @@ static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 	return frh->table;
 }
 
-extern struct fib_rules_ops *fib_rules_register(struct fib_rules_ops *, struct net *);
+extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
 extern void fib_rules_unregister(struct fib_rules_ops *);
 extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
 

net/core/fib_rules.c

@@ -122,7 +122,7 @@ errout:
 }
 
 struct fib_rules_ops *
-fib_rules_register(struct fib_rules_ops *tmpl, struct net *net)
+fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
 {
 	struct fib_rules_ops *ops;
 	int err;

net/decnet/dn_rules.c

@@ -216,7 +216,7 @@ static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
 	dn_rt_cache_flush(-1);
 }
 
-static struct fib_rules_ops dn_fib_rules_ops_template = {
+static const struct fib_rules_ops __net_initdata dn_fib_rules_ops_template = {
 	.family		= FIB_RULES_DECNET,
 	.rule_size	= sizeof(struct dn_fib_rule),
 	.addr_size	= sizeof(u16),

net/ipv4/fib_rules.c

@@ -245,7 +245,7 @@ static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
 	rt_cache_flush(ops->fro_net, -1);
 }
 
-static struct fib_rules_ops fib4_rules_ops_template = {
+static const struct fib_rules_ops __net_initdata fib4_rules_ops_template = {
 	.family		= FIB_RULES_IPV4,
 	.rule_size	= sizeof(struct fib4_rule),
 	.addr_size	= sizeof(u32),

net/ipv4/ipmr.c

@@ -216,7 +216,7 @@ static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
 	return 0;
 }
 
-static struct fib_rules_ops ipmr_rules_ops_template = {
+static const struct fib_rules_ops __net_initdata ipmr_rules_ops_template = {
 	.family		= FIB_RULES_IPMR,
 	.rule_size	= sizeof(struct ipmr_rule),
 	.addr_size	= sizeof(u32),

net/ipv6/fib6_rules.c

@@ -237,7 +237,7 @@ static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
 	       + nla_total_size(16); /* src */
 }
 
-static struct fib_rules_ops fib6_rules_ops_template = {
+static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
 	.family			= FIB_RULES_IPV6,
 	.rule_size		= sizeof(struct fib6_rule),
 	.addr_size		= sizeof(struct in6_addr),