net/ipv4/fib_trie.c



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2641


/*
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version
 *   2 of the License, or (at your option) any later version.
 *
 *   Robert Olsson <robert.olsson@its.uu.se> Uppsala Universitet
 *     & Swedish University of Agricultural Sciences.
 *
 *   Jens Laas <jens.laas@data.slu.se> Swedish University of
 *     Agricultural Sciences.
 *
 *   Hans Liss <hans.liss@its.uu.se>  Uppsala Universitet
 *
 * This work is based on the LPC-trie which is originally described in:
 *
 * An experimental study of compression methods for dynamic tries
 * Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
 * http://www.csc.kth.se/~snilsson/software/dyntrie2/
 *
 *
 * IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
 * IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
 *
 *
 * Code from fib_hash has been reused which includes the following header:
 *
 *
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		IPv4 FIB: lookup engine and maintenance routines.
 *
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Substantial contributions to this work comes from:
 *
 *		David S. Miller, <davem@davemloft.net>
 *		Stephen Hemminger <shemminger@osdl.org>
 *		Paul E. McKenney <paulmck@us.ibm.com>
 *		Patrick McHardy <kaber@trash.net>
 */

#define VERSION "0.409"

#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/proc_fs.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/sock.h>
#include <net/ip_fib.h>
#include "fib_lookup.h"

#define MAX_STAT_DEPTH 32

#define KEYLENGTH (8*sizeof(t_key))

typedef unsigned int t_key;

#define T_TNODE 0
#define T_LEAF  1
#define NODE_TYPE_MASK	0x1UL
#define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK)

#define IS_TNODE(n) (!(n->parent & T_LEAF))
#define IS_LEAF(n) (n->parent & T_LEAF)

struct rt_trie_node {
	unsigned long parent;
	t_key key;
};

struct leaf {
	unsigned long parent;
	t_key key;
	struct hlist_head list;
	struct rcu_head rcu;
};

struct leaf_info {
	struct hlist_node hlist;
	struct rcu_head rcu;
	int plen;
	struct list_head falh;
};

struct tnode {
	unsigned long parent;
	t_key key;
	unsigned char pos;		/* 2log(KEYLENGTH) bits needed */
	unsigned char bits;		/* 2log(KEYLENGTH) bits needed */
	unsigned int full_children;	/* KEYLENGTH bits needed */
	unsigned int empty_children;	/* KEYLENGTH bits needed */
	union {
		struct rcu_head rcu;
		struct work_struct work;
		struct tnode *tnode_free;
	};
	struct rt_trie_node __rcu *child[0];
};

#ifdef CONFIG_IP_FIB_TRIE_STATS
struct trie_use_stats {
	unsigned int gets;
	unsigned int backtrack;
	unsigned int semantic_match_passed;
	unsigned int semantic_match_miss;
	unsigned int null_node_hit;
	unsigned int resize_node_skipped;
};
#endif

struct trie_stat {
	unsigned int totdepth;
	unsigned int maxdepth;
	unsigned int tnodes;
	unsigned int leaves;
	unsigned int nullpointers;
	unsigned int prefixes;
	unsigned int nodesizes[MAX_STAT_DEPTH];
};

struct trie {
	struct rt_trie_node __rcu *trie;
#ifdef CONFIG_IP_FIB_TRIE_STATS
	struct trie_use_stats stats;
#endif
};

static void put_child(struct trie *t, struct tnode *tn, int i, struct rt_trie_node *n);
static void tnode_put_child_reorg(struct tnode *tn, int i, struct rt_trie_node *n,
				  int wasfull);
static struct rt_trie_node *resize(struct trie *t, struct tnode *tn);
static struct tnode *inflate(struct trie *t, struct tnode *tn);
static struct tnode *halve(struct trie *t, struct tnode *tn);
/* tnodes to free after resize(); protected by RTNL */
static struct tnode *tnode_free_head;
static size_t tnode_free_size;

/*
 * synchronize_rcu after call_rcu for that many pages; it should be especially
 * useful before resizing the root node with PREEMPT_NONE configs; the value was
 * obtained experimentally, aiming to avoid visible slowdown.
 */
static const int sync_pages = 128;

static struct kmem_cache *fn_alias_kmem __read_mostly;
static struct kmem_cache *trie_leaf_kmem __read_mostly;

/*
 * caller must hold RTNL
 */
static inline struct tnode *node_parent(const struct rt_trie_node *node)
{
	unsigned long parent;

	parent = rcu_dereference_index_check(node->parent, lockdep_rtnl_is_held());

	return (struct tnode *)(parent & ~NODE_TYPE_MASK);
}

/*
 * caller must hold RCU read lock or RTNL
 */
static inline struct tnode *node_parent_rcu(const struct rt_trie_node *node)
{
	unsigned long parent;

	parent = rcu_dereference_index_check(node->parent, rcu_read_lock_held() ||
							   lockdep_rtnl_is_held());

	return (struct tnode *)(parent & ~NODE_TYPE_MASK);
}

/* Same as rcu_assign_pointer
 * but that macro() assumes that value is a pointer.
 */
static inline void node_set_parent(struct rt_trie_node *node, struct tnode *ptr)
{
	smp_wmb();
	node->parent = (unsigned long)ptr | NODE_TYPE(node);
}

/*
 * caller must hold RTNL
 */
static inline struct rt_trie_node *tnode_get_child(const struct tnode *tn, unsigned int i)
{
	BUG_ON(i >= 1U << tn->bits);

	return rtnl_dereference(tn->child[i]);
}

/*
 * caller must hold RCU read lock or RTNL
 */
static inline struct rt_trie_node *tnode_get_child_rcu(const struct tnode *tn, unsigned int i)
{
	BUG_ON(i >= 1U << tn->bits);

	return rcu_dereference_rtnl(tn->child[i]);
}

static inline int tnode_child_length(const struct tnode *tn)
{
	return 1 << tn->bits;
}

static inline t_key mask_pfx(t_key k, unsigned int l)
{
	return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l);
}

static inline t_key tkey_extract_bits(t_key a, unsigned int offset, unsigned int bits)
{
	if (offset < KEYLENGTH)
		return ((t_key)(a << offset)) >> (KEYLENGTH - bits);
	else
		return 0;
}

static inline int tkey_equals(t_key a, t_key b)
{
	return a == b;
}

static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b)
{
	if (bits == 0 || offset >= KEYLENGTH)
		return 1;
	bits = bits > KEYLENGTH ? KEYLENGTH : bits;
	return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0;
}

static inline int tkey_mismatch(t_key a, int offset, t_key b)
{
	t_key diff = a ^ b;
	int i = offset;

	if (!diff)
		return 0;
	while ((diff << i) >> (KEYLENGTH-1) == 0)
		i++;
	return i;
}

/*
  To understand this stuff, an understanding of keys and all their bits is
  necessary. Every node in the trie has a key associated with it, but not
  all of the bits in that key are significant.

  Consider a node 'n' and its parent 'tp'.

  If n is a leaf, every bit in its key is significant. Its presence is
  necessitated by path compression, since during a tree traversal (when
  searching for a leaf - unless we are doing an insertion) we will completely
  ignore all skipped bits we encounter. Thus we need to verify, at the end of
  a potentially successful search, that we have indeed been walking the
  correct key path.

  Note that we can never "miss" the correct key in the tree if present by
  following the wrong path. Path compression ensures that segments of the key
  that are the same for all keys with a given prefix are skipped, but the
  skipped part *is* identical for each node in the subtrie below the skipped
  bit! trie_insert() in this implementation takes care of that - note the
  call to tkey_sub_equals() in trie_insert().

  if n is an internal node - a 'tnode' here, the various parts of its key
  have many different meanings.

  Example:
  _________________________________________________________________
  | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C |
  -----------------------------------------------------------------
    0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15

  _________________________________________________________________
  | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u |
  -----------------------------------------------------------------
   16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31

  tp->pos = 7
  tp->bits = 3
  n->pos = 15
  n->bits = 4

  First, let's just ignore the bits that come before the parent tp, that is
  the bits from 0 to (tp->pos-1). They are *known* but at this point we do
  not use them for anything.

  The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the
  index into the parent's child array. That is, they will be used to find
  'n' among tp's children.

  The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits
  for the node n.

  All the bits we have seen so far are significant to the node n. The rest
  of the bits are really not needed or indeed known in n->key.