Commit f4530fa5 authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Avoid overhead when no custom FIB rules are installed. 



If the user hasn't actually installed any custom rules, or fiddled
with the default ones, don't go through the whole FIB rules layer.

It's just pure overhead.

Instead do what we do with CONFIG_IP_MULTIPLE_TABLES disabled, check
the individual tables by hand, one by one.

Also, move fib_num_tclassid_users into the ipv4 network namespace.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 700db99d

include/net/ip_fib.h

+32 −4
Original line number Diff line number Diff line
@@ -220,11 +220,33 @@ extern void __net_exit fib4_rules_exit(struct net *net); 
extern u32 fib_rules_tclass(const struct fib_result *res);

#endif



extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res);



extern struct fib_table *fib_new_table(struct net *net, u32 id);

extern struct fib_table *fib_get_table(struct net *net, u32 id);



extern int __fib_lookup(struct net *net, struct flowi4 *flp,

			struct fib_result *res);



static inline int fib_lookup(struct net *net, struct flowi4 *flp,

			     struct fib_result *res)

{

	if (!net->ipv4.fib_has_custom_rules) {

		if (net->ipv4.fib_local &&

		    !fib_table_lookup(net->ipv4.fib_local, flp, res,

				      FIB_LOOKUP_NOREF))

			return 0;

		if (net->ipv4.fib_main &&

		    !fib_table_lookup(net->ipv4.fib_main, flp, res,

				      FIB_LOOKUP_NOREF))

			return 0;

		if (net->ipv4.fib_default &&

		    !fib_table_lookup(net->ipv4.fib_default, flp, res,

				      FIB_LOOKUP_NOREF))

			return 0;

		return -ENETUNREACH;

	}

	return __fib_lookup(net, flp, res);

}



#endif /* CONFIG_IP_MULTIPLE_TABLES */



/* Exported by fib_frontend.c */
@@ -236,9 +258,15 @@ extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 
			       struct in_device *idev, u32 *itag);

extern void fib_select_default(struct fib_result *res);

#ifdef CONFIG_IP_ROUTE_CLASSID

extern int fib_num_tclassid_users;

static inline int fib_num_tclassid_users(struct net *net)

{

	return net->ipv4.fib_num_tclassid_users;

}

#else

#define fib_num_tclassid_users 0

static inline int fib_num_tclassid_users(struct net *net)

{

	return 0;

}

#endif



/* Exported by fib_semantics.c */

include/net/netns/ipv4.h

+8 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ struct ctl_table_header; 
struct ipv4_devconf;

struct fib_rules_ops;

struct hlist_head;

struct fib_table;

struct sock;



struct netns_ipv4 {
@@ -24,6 +25,13 @@ struct netns_ipv4 { 
	struct ipv4_devconf	*devconf_dflt;

#ifdef CONFIG_IP_MULTIPLE_TABLES

	struct fib_rules_ops	*rules_ops;

	bool			fib_has_custom_rules;

	struct fib_table	*fib_local;

	struct fib_table	*fib_main;

	struct fib_table	*fib_default;

#endif

#ifdef CONFIG_IP_ROUTE_CLASSID

	int			fib_num_tclassid_users;

#endif

	struct hlist_head	*fib_table_hash;

	struct sock		*fibnl;

net/ipv4/fib_frontend.c

+22 −5
Original line number Diff line number Diff line
@@ -86,6 +86,24 @@ struct fib_table *fib_new_table(struct net *net, u32 id) 
	tb = fib_trie_table(id);

	if (!tb)

		return NULL;



	switch (id) {

	case RT_TABLE_LOCAL:

		net->ipv4.fib_local = tb;

		break;



	case RT_TABLE_MAIN:

		net->ipv4.fib_main = tb;

		break;



	case RT_TABLE_DEFAULT:

		net->ipv4.fib_default = tb;

		break;



	default:

		break;

	}



	h = id & (FIB_TABLE_HASHSZ - 1);

	hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);

	return tb;
@@ -218,10 +236,6 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb) 
	return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);

}



#ifdef CONFIG_IP_ROUTE_CLASSID

int fib_num_tclassid_users __read_mostly;

#endif



/* Given (packet source, input interface) and optional (dst, oif, tos):

 * - (main) check, that source is valid i.e. not broadcast or our local

 *   address.
@@ -312,7 +326,7 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 
{

	int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);



	if (!r && !fib_num_tclassid_users) {

	if (!r && !fib_num_tclassid_users(dev_net(dev))) {

		*itag = 0;

		return 0;

	}
@@ -1134,6 +1148,9 @@ static int __net_init fib_net_init(struct net *net) 
{

	int error;



#ifdef CONFIG_IP_ROUTE_CLASSID

	net->ipv4.fib_num_tclassid_users = 0;

#endif

	error = ip_fib_net_init(net);

	if (error < 0)

		goto out;

net/ipv4/fib_rules.c

+8 −4
Original line number Diff line number Diff line
@@ -54,7 +54,7 @@ u32 fib_rules_tclass(const struct fib_result *res) 
}

#endif



int fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)

int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)

{

	struct fib_lookup_arg arg = {

		.result = res,
@@ -67,7 +67,7 @@ int fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res) 


	return err;

}

EXPORT_SYMBOL_GPL(fib_lookup);

EXPORT_SYMBOL_GPL(__fib_lookup);



static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,

			    int flags, struct fib_lookup_arg *arg)
@@ -172,7 +172,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb, 
	if (tb[FRA_FLOW]) {

		rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);

		if (rule4->tclassid)

			fib_num_tclassid_users++;

			net->ipv4.fib_num_tclassid_users++;

	}

#endif
@@ -182,6 +182,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb, 
	rule4->dstmask = inet_make_mask(rule4->dst_len);

	rule4->tos = frh->tos;



	net->ipv4.fib_has_custom_rules = true;

	err = 0;

errout:

	return err;
@@ -189,12 +190,14 @@ errout: 


static void fib4_rule_delete(struct fib_rule *rule)

{

	struct net *net = rule->fr_net;

#ifdef CONFIG_IP_ROUTE_CLASSID

	struct fib4_rule *rule4 = (struct fib4_rule *) rule;



	if (rule4->tclassid)

		fib_num_tclassid_users--;

		net->ipv4.fib_num_tclassid_users--;

#endif

	net->ipv4.fib_has_custom_rules = true;

}



static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
@@ -309,6 +312,7 @@ int __net_init fib4_rules_init(struct net *net) 
	if (err < 0)

		goto fail;

	net->ipv4.rules_ops = ops;

	net->ipv4.fib_has_custom_rules = false;

	return 0;



fail:

net/ipv4/fib_semantics.c

+3 −3
Original line number Diff line number Diff line
@@ -166,7 +166,7 @@ void free_fib_info(struct fib_info *fi) 
#ifdef CONFIG_IP_ROUTE_CLASSID

	change_nexthops(fi) {

		if (nexthop_nh->nh_tclassid)

			fib_num_tclassid_users--;

			fi->fib_net->ipv4.fib_num_tclassid_users--;

	} endfor_nexthops(fi);

#endif

	call_rcu(&fi->rcu, free_fib_info_rcu);
@@ -428,7 +428,7 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, 
			nla = nla_find(attrs, attrlen, RTA_FLOW);

			nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0;

			if (nexthop_nh->nh_tclassid)

				fib_num_tclassid_users++;

				fi->fib_net->ipv4.fib_num_tclassid_users++;

#endif

		}
@@ -824,7 +824,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg) 
#ifdef CONFIG_IP_ROUTE_CLASSID

		nh->nh_tclassid = cfg->fc_flow;

		if (nh->nh_tclassid)

			fib_num_tclassid_users++;

			fi->fib_net->ipv4.fib_num_tclassid_users++;

#endif

#ifdef CONFIG_IP_ROUTE_MULTIPATH

		nh->nh_weight = 1;

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