* 2 of the License, or (at your option) any later version.
*/
-#define VERSION "0.325"
+#define VERSION "0.403"
#include <linux/config.h>
#include <asm/uaccess.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>
#undef CONFIG_IP_FIB_TRIE_STATS
#define MAX_CHILDS 16384
-#define EXTRACT(p, n, str) ((str)<<(p)>>(32-(n)))
#define KEYLENGTH (8*sizeof(t_key))
#define MASK_PFX(k, l) (((l)==0)?0:(k >> (KEYLENGTH-l)) << (KEYLENGTH-l))
#define TKEY_GET_MASK(offset, bits) (((bits)==0)?0:((t_key)(-1) << (KEYLENGTH - bits) >> offset))
-static DEFINE_RWLOCK(fib_lock);
-
typedef unsigned int t_key;
#define T_TNODE 0
#define T_LEAF 1
#define NODE_TYPE_MASK 0x1UL
-#define NODE_PARENT(_node) \
- ((struct tnode *)((_node)->_parent & ~NODE_TYPE_MASK))
-#define NODE_SET_PARENT(_node, _ptr) \
- ((_node)->_parent = (((unsigned long)(_ptr)) | \
- ((_node)->_parent & NODE_TYPE_MASK)))
-#define NODE_INIT_PARENT(_node, _type) \
- ((_node)->_parent = (_type))
-#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)
+#define NODE_PARENT(node) \
+ ((struct tnode *)rcu_dereference(((node)->parent & ~NODE_TYPE_MASK)))
+
+#define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK)
+
+#define NODE_SET_PARENT(node, ptr) \
+ rcu_assign_pointer((node)->parent, \
+ ((unsigned long)(ptr)) | NODE_TYPE(node))
+
+#define IS_TNODE(n) (!(n->parent & T_LEAF))
+#define IS_LEAF(n) (n->parent & T_LEAF)
struct node {
- t_key key;
- unsigned long _parent;
+ t_key key;
+ unsigned long parent;
};
struct leaf {
- t_key key;
- unsigned long _parent;
+ t_key key;
+ unsigned long parent;
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 {
- t_key key;
- unsigned long _parent;
- unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */
- unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */
- unsigned short full_children; /* KEYLENGTH bits needed */
- unsigned short empty_children; /* KEYLENGTH bits needed */
- struct node *child[0];
+ t_key key;
+ unsigned long parent;
+ unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */
+ unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */
+ unsigned short full_children; /* KEYLENGTH bits needed */
+ unsigned short empty_children; /* KEYLENGTH bits needed */
+ struct rcu_head rcu;
+ struct node *child[0];
};
#ifdef CONFIG_IP_FIB_TRIE_STATS
};
struct trie {
- struct node *trie;
+ struct node *trie;
#ifdef CONFIG_IP_FIB_TRIE_STATS
struct trie_use_stats stats;
#endif
- int size;
+ int size;
unsigned int revision;
};
-static int trie_debug = 0;
-
-static int tnode_full(struct tnode *tn, struct node *n);
static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n);
static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull);
-static int tnode_child_length(struct tnode *tn);
static struct node *resize(struct trie *t, struct tnode *tn);
-static struct tnode *inflate(struct trie *t, struct tnode *tn, int *err);
-static struct tnode *halve(struct trie *t, struct tnode *tn, int *err);
+static struct tnode *inflate(struct trie *t, struct tnode *tn);
+static struct tnode *halve(struct trie *t, struct tnode *tn);
static void tnode_free(struct tnode *tn);
-static void trie_dump_seq(struct seq_file *seq, struct trie *t);
-extern struct fib_alias *fib_find_alias(struct list_head *fah, u8 tos, u32 prio);
-extern int fib_detect_death(struct fib_info *fi, int order,
- struct fib_info **last_resort, int *last_idx, int *dflt);
-
-extern void rtmsg_fib(int event, u32 key, struct fib_alias *fa, int z, int tb_id,
- struct nlmsghdr *n, struct netlink_skb_parms *req);
-static kmem_cache_t *fn_alias_kmem;
+static kmem_cache_t *fn_alias_kmem __read_mostly;
static struct trie *trie_local = NULL, *trie_main = NULL;
-static void trie_bug(char *err)
-{
- printk("Trie Bug: %s\n", err);
- BUG();
-}
+
+/* rcu_read_lock needs to be hold by caller from readside */
static inline struct node *tnode_get_child(struct tnode *tn, int i)
{
- if (i >= 1<<tn->bits)
- trie_bug("tnode_get_child");
+ BUG_ON(i >= 1 << tn->bits);
- return tn->child[i];
+ return rcu_dereference(tn->child[i]);
}
-static inline int tnode_child_length(struct tnode *tn)
+static inline int tnode_child_length(const struct tnode *tn)
{
- return 1<<tn->bits;
+ return 1 << tn->bits;
}
-/*
- _________________________________________________________________
- | 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
- KEYLENGTH=32
-*/
-
static inline t_key tkey_extract_bits(t_key a, int offset, int bits)
{
- if (offset < KEYLENGTH)
+ if (offset < KEYLENGTH)
return ((t_key)(a << offset)) >> (KEYLENGTH - bits);
- else
+ else
return 0;
}
{
if (bits == 0 || offset >= KEYLENGTH)
return 1;
- bits = bits > KEYLENGTH ? KEYLENGTH : bits;
- return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0;
+ 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)
return i;
}
-/* Candiate for fib_semantics */
-
-static void fn_free_alias(struct fib_alias *fa)
-{
- fib_release_info(fa->fa_info);
- kmem_cache_free(fn_alias_kmem, fa);
-}
-
/*
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
tp->pos = 7
tp->bits = 3
n->pos = 15
- n->bits=4
+ 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
*/
-static void check_tnode(struct tnode *tn)
+static inline void check_tnode(const struct tnode *tn)
{
- if (tn && tn->pos+tn->bits > 32) {
- printk("TNODE ERROR tn=%p, pos=%d, bits=%d\n", tn, tn->pos, tn->bits);
- }
+ WARN_ON(tn && tn->pos+tn->bits > 32);
}
static int halve_threshold = 25;
static int inflate_threshold = 50;
-static struct leaf *leaf_new(void)
+
+static void __alias_free_mem(struct rcu_head *head)
{
- struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL);
- if (l) {
- NODE_INIT_PARENT(l, T_LEAF);
- INIT_HLIST_HEAD(&l->list);
- }
- return l;
+ struct fib_alias *fa = container_of(head, struct fib_alias, rcu);
+ kmem_cache_free(fn_alias_kmem, fa);
}
-static struct leaf_info *leaf_info_new(int plen)
+static inline void alias_free_mem_rcu(struct fib_alias *fa)
{
- struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL);
- if (li) {
- li->plen = plen;
- INIT_LIST_HEAD(&li->falh);
- }
- return li;
+ call_rcu(&fa->rcu, __alias_free_mem);
+}
+
+static void __leaf_free_rcu(struct rcu_head *head)
+{
+ kfree(container_of(head, struct leaf, rcu));
+}
+
+static inline void free_leaf(struct leaf *leaf)
+{
+ call_rcu(&leaf->rcu, __leaf_free_rcu);
}
-static inline void free_leaf(struct leaf *l)
+static void __leaf_info_free_rcu(struct rcu_head *head)
{
- kfree(l);
+ kfree(container_of(head, struct leaf_info, rcu));
}
-static inline void free_leaf_info(struct leaf_info *li)
+static inline void free_leaf_info(struct leaf_info *leaf)
{
- kfree(li);
+ call_rcu(&leaf->rcu, __leaf_info_free_rcu);
}
static struct tnode *tnode_alloc(unsigned int size)
{
- if (size <= PAGE_SIZE) {
- return kmalloc(size, GFP_KERNEL);
- } else {
- return (struct tnode *)
- __get_free_pages(GFP_KERNEL, get_order(size));
- }
+ struct page *pages;
+
+ if (size <= PAGE_SIZE)
+ return kcalloc(size, 1, GFP_KERNEL);
+
+ pages = alloc_pages(GFP_KERNEL|__GFP_ZERO, get_order(size));
+ if (!pages)
+ return NULL;
+
+ return page_address(pages);
}
-static void __tnode_free(struct tnode *tn)
+static void __tnode_free_rcu(struct rcu_head *head)
{
+ struct tnode *tn = container_of(head, struct tnode, rcu);
unsigned int size = sizeof(struct tnode) +
- (1<<tn->bits) * sizeof(struct node *);
+ (1 << tn->bits) * sizeof(struct node *);
if (size <= PAGE_SIZE)
kfree(tn);
free_pages((unsigned long)tn, get_order(size));
}
+static inline void tnode_free(struct tnode *tn)
+{
+ call_rcu(&tn->rcu, __tnode_free_rcu);
+}
+
+static struct leaf *leaf_new(void)
+{
+ struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL);
+ if (l) {
+ l->parent = T_LEAF;
+ INIT_HLIST_HEAD(&l->list);
+ }
+ return l;
+}
+
+static struct leaf_info *leaf_info_new(int plen)
+{
+ struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL);
+ if (li) {
+ li->plen = plen;
+ INIT_LIST_HEAD(&li->falh);
+ }
+ return li;
+}
+
static struct tnode* tnode_new(t_key key, int pos, int bits)
{
int nchildren = 1<<bits;
int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *);
struct tnode *tn = tnode_alloc(sz);
- if (tn) {
+ if (tn) {
memset(tn, 0, sz);
- NODE_INIT_PARENT(tn, T_TNODE);
+ tn->parent = T_TNODE;
tn->pos = pos;
tn->bits = bits;
tn->key = key;
tn->empty_children = 1<<bits;
}
- if (trie_debug > 0)
- printk("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode),
- (unsigned int) (sizeof(struct node) * 1<<bits));
+ pr_debug("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode),
+ (unsigned int) (sizeof(struct node) * 1<<bits));
return tn;
}
-static void tnode_free(struct tnode *tn)
-{
- if (!tn) {
- trie_bug("tnode_free\n");
- }
- if (IS_LEAF(tn)) {
- free_leaf((struct leaf *)tn);
- if (trie_debug > 0 )
- printk("FL %p \n", tn);
- }
- else if (IS_TNODE(tn)) {
- __tnode_free(tn);
- if (trie_debug > 0 )
- printk("FT %p \n", tn);
- }
- else {
- trie_bug("tnode_free\n");
- }
-}
-
/*
* Check whether a tnode 'n' is "full", i.e. it is an internal node
* and no bits are skipped. See discussion in dyntree paper p. 6
*/
-static inline int tnode_full(struct tnode *tn, struct node *n)
+static inline int tnode_full(const struct tnode *tn, const struct node *n)
{
if (n == NULL || IS_LEAF(n))
return 0;
static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull)
{
- struct node *chi;
+ struct node *chi = tn->child[i];
int isfull;
- if (i >= 1<<tn->bits) {
- printk("bits=%d, i=%d\n", tn->bits, i);
- trie_bug("tnode_put_child_reorg bits");
- }
- write_lock_bh(&fib_lock);
- chi = tn->child[i];
+ BUG_ON(i >= 1<<tn->bits);
+
/* update emptyChildren */
if (n == NULL && chi != NULL)
tn->empty_children--;
/* update fullChildren */
- if (wasfull == -1)
+ if (wasfull == -1)
wasfull = tnode_full(tn, chi);
isfull = tnode_full(tn, n);
if (wasfull && !isfull)
tn->full_children--;
-
else if (!wasfull && isfull)
tn->full_children++;
+
if (n)
NODE_SET_PARENT(n, tn);
- tn->child[i] = n;
- write_unlock_bh(&fib_lock);
+ rcu_assign_pointer(tn->child[i], n);
}
static struct node *resize(struct trie *t, struct tnode *tn)
{
int i;
int err = 0;
+ struct tnode *old_tn;
if (!tn)
return NULL;
- if (trie_debug)
- printk("In tnode_resize %p inflate_threshold=%d threshold=%d\n",
- tn, inflate_threshold, halve_threshold);
+ pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n",
+ tn, inflate_threshold, halve_threshold);
/* No children */
if (tn->empty_children == tnode_child_length(tn)) {
/* One child */
if (tn->empty_children == tnode_child_length(tn) - 1)
for (i = 0; i < tnode_child_length(tn); i++) {
+ struct node *n;
- write_lock_bh(&fib_lock);
- if (tn->child[i] != NULL) {
-
- /* compress one level */
- struct node *n = tn->child[i];
- if (n)
- NODE_INIT_PARENT(n, NODE_TYPE(n));
+ n = tn->child[i];
+ if (!n)
+ continue;
- write_unlock_bh(&fib_lock);
- tnode_free(tn);
- return n;
- }
- write_unlock_bh(&fib_lock);
+ /* compress one level */
+ NODE_SET_PARENT(n, NULL);
+ tnode_free(tn);
+ return n;
}
/*
* Double as long as the resulting node has a number of
*
* expand not_to_be_doubled and to_be_doubled, and shorten:
* 100 * (tnode_child_length(tn) - tn->empty_children +
- * tn->full_children ) >= inflate_threshold * new_child_length
+ * tn->full_children) >= inflate_threshold * new_child_length
*
* expand new_child_length:
* 100 * (tnode_child_length(tn) - tn->empty_children +
- * tn->full_children ) >=
+ * tn->full_children) >=
* inflate_threshold * tnode_child_length(tn) * 2
*
* shorten again:
* 50 * (tn->full_children + tnode_child_length(tn) -
- * tn->empty_children ) >= inflate_threshold *
+ * tn->empty_children) >= inflate_threshold *
* tnode_child_length(tn)
*
*/
50 * (tn->full_children + tnode_child_length(tn) - tn->empty_children) >=
inflate_threshold * tnode_child_length(tn))) {
- tn = inflate(t, tn, &err);
-
- if (err) {
+ old_tn = tn;
+ tn = inflate(t, tn);
+ if (IS_ERR(tn)) {
+ tn = old_tn;
#ifdef CONFIG_IP_FIB_TRIE_STATS
t->stats.resize_node_skipped++;
#endif
100 * (tnode_child_length(tn) - tn->empty_children) <
halve_threshold * tnode_child_length(tn)) {
- tn = halve(t, tn, &err);
-
- if (err) {
+ old_tn = tn;
+ tn = halve(t, tn);
+ if (IS_ERR(tn)) {
+ tn = old_tn;
#ifdef CONFIG_IP_FIB_TRIE_STATS
t->stats.resize_node_skipped++;
#endif
/* Only one child remains */
-
if (tn->empty_children == tnode_child_length(tn) - 1)
for (i = 0; i < tnode_child_length(tn); i++) {
-
- write_lock_bh(&fib_lock);
- if (tn->child[i] != NULL) {
- /* compress one level */
- struct node *n = tn->child[i];
-
- if (n)
- NODE_INIT_PARENT(n, NODE_TYPE(n));
-
- write_unlock_bh(&fib_lock);
- tnode_free(tn);
- return n;
- }
- write_unlock_bh(&fib_lock);
+ struct node *n;
+
+ n = tn->child[i];
+ if (!n)
+ continue;
+
+ /* compress one level */
+
+ NODE_SET_PARENT(n, NULL);
+ tnode_free(tn);
+ return n;
}
return (struct node *) tn;
}
-static struct tnode *inflate(struct trie *t, struct tnode *tn, int *err)
+static struct tnode *inflate(struct trie *t, struct tnode *tn)
{
struct tnode *inode;
struct tnode *oldtnode = tn;
int olen = tnode_child_length(tn);
int i;
- if (trie_debug)
- printk("In inflate\n");
+ pr_debug("In inflate\n");
tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1);
- if (!tn) {
- *err = -ENOMEM;
- return oldtnode;
- }
+ if (!tn)
+ return ERR_PTR(-ENOMEM);
/*
* Preallocate and store tnodes before the actual work so we
* fails. In case of failure we return the oldnode and inflate
* of tnode is ignored.
*/
-
- for(i = 0; i < olen; i++) {
+
+ for (i = 0; i < olen; i++) {
struct tnode *inode = (struct tnode *) tnode_get_child(oldtnode, i);
if (inode &&
inode->pos == oldtnode->pos + oldtnode->bits &&
inode->bits > 1) {
struct tnode *left, *right;
-
t_key m = TKEY_GET_MASK(inode->pos, 1);
left = tnode_new(inode->key&(~m), inode->pos + 1,
inode->bits - 1);
+ if (!left)
+ goto nomem;
- if (!left) {
- *err = -ENOMEM;
- break;
- }
-
right = tnode_new(inode->key|m, inode->pos + 1,
inode->bits - 1);
- if (!right) {
- *err = -ENOMEM;
- break;
- }
+ if (!right) {
+ tnode_free(left);
+ goto nomem;
+ }
put_child(t, tn, 2*i, (struct node *) left);
put_child(t, tn, 2*i+1, (struct node *) right);
}
}
- if (*err) {
- int size = tnode_child_length(tn);
- int j;
-
- for(j = 0; j < size; j++)
- if (tn->child[j])
- tnode_free((struct tnode *)tn->child[j]);
-
- tnode_free(tn);
-
- *err = -ENOMEM;
- return oldtnode;
- }
-
- for(i = 0; i < olen; i++) {
+ for (i = 0; i < olen; i++) {
struct node *node = tnode_get_child(oldtnode, i);
+ struct tnode *left, *right;
+ int size, j;
/* An empty child */
if (node == NULL)
put_child(t, tn, 2*i+1, inode->child[1]);
tnode_free(inode);
+ continue;
}
- /* An internal node with more than two children */
- else {
- struct tnode *left, *right;
- int size, j;
-
- /* We will replace this node 'inode' with two new
- * ones, 'left' and 'right', each with half of the
- * original children. The two new nodes will have
- * a position one bit further down the key and this
- * means that the "significant" part of their keys
- * (see the discussion near the top of this file)
- * will differ by one bit, which will be "0" in
- * left's key and "1" in right's key. Since we are
- * moving the key position by one step, the bit that
- * we are moving away from - the bit at position
- * (inode->pos) - is the one that will differ between
- * left and right. So... we synthesize that bit in the
- * two new keys.
- * The mask 'm' below will be a single "one" bit at
- * the position (inode->pos)
- */
-
- /* Use the old key, but set the new significant
- * bit to zero.
- */
-
- left = (struct tnode *) tnode_get_child(tn, 2*i);
- put_child(t, tn, 2*i, NULL);
+ /* An internal node with more than two children */
+
+ /* We will replace this node 'inode' with two new
+ * ones, 'left' and 'right', each with half of the
+ * original children. The two new nodes will have
+ * a position one bit further down the key and this
+ * means that the "significant" part of their keys
+ * (see the discussion near the top of this file)
+ * will differ by one bit, which will be "0" in
+ * left's key and "1" in right's key. Since we are
+ * moving the key position by one step, the bit that
+ * we are moving away from - the bit at position
+ * (inode->pos) - is the one that will differ between
+ * left and right. So... we synthesize that bit in the
+ * two new keys.
+ * The mask 'm' below will be a single "one" bit at
+ * the position (inode->pos)
+ */
- if (!left)
- BUG();
+ /* Use the old key, but set the new significant
+ * bit to zero.
+ */
- right = (struct tnode *) tnode_get_child(tn, 2*i+1);
- put_child(t, tn, 2*i+1, NULL);
+ left = (struct tnode *) tnode_get_child(tn, 2*i);
+ put_child(t, tn, 2*i, NULL);
- if (!right)
- BUG();
+ BUG_ON(!left);
- size = tnode_child_length(left);
- for(j = 0; j < size; j++) {
- put_child(t, left, j, inode->child[j]);
- put_child(t, right, j, inode->child[j + size]);
- }
- put_child(t, tn, 2*i, resize(t, left));
- put_child(t, tn, 2*i+1, resize(t, right));
+ right = (struct tnode *) tnode_get_child(tn, 2*i+1);
+ put_child(t, tn, 2*i+1, NULL);
- tnode_free(inode);
+ BUG_ON(!right);
+
+ size = tnode_child_length(left);
+ for (j = 0; j < size; j++) {
+ put_child(t, left, j, inode->child[j]);
+ put_child(t, right, j, inode->child[j + size]);
}
+ put_child(t, tn, 2*i, resize(t, left));
+ put_child(t, tn, 2*i+1, resize(t, right));
+
+ tnode_free(inode);
}
tnode_free(oldtnode);
return tn;
+nomem:
+ {
+ int size = tnode_child_length(tn);
+ int j;
+
+ for (j = 0; j < size; j++)
+ if (tn->child[j])
+ tnode_free((struct tnode *)tn->child[j]);
+
+ tnode_free(tn);
+
+ return ERR_PTR(-ENOMEM);
+ }
}
-static struct tnode *halve(struct trie *t, struct tnode *tn, int *err)
+static struct tnode *halve(struct trie *t, struct tnode *tn)
{
struct tnode *oldtnode = tn;
struct node *left, *right;
int i;
int olen = tnode_child_length(tn);
- if (trie_debug) printk("In halve\n");
+ pr_debug("In halve\n");
tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1);
- if (!tn) {
- *err = -ENOMEM;
- return oldtnode;
- }
+ if (!tn)
+ return ERR_PTR(-ENOMEM);
/*
* Preallocate and store tnodes before the actual work so we
* of tnode is ignored.
*/
- for(i = 0; i < olen; i += 2) {
+ for (i = 0; i < olen; i += 2) {
left = tnode_get_child(oldtnode, i);
right = tnode_get_child(oldtnode, i+1);
/* Two nonempty children */
- if (left && right) {
- struct tnode *newBinNode =
- tnode_new(left->key, tn->pos + tn->bits, 1);
+ if (left && right) {
+ struct tnode *newn;
- if (!newBinNode) {
- *err = -ENOMEM;
- break;
- }
- put_child(t, tn, i/2, (struct node *)newBinNode);
- }
- }
+ newn = tnode_new(left->key, tn->pos + tn->bits, 1);
- if (*err) {
- int size = tnode_child_length(tn);
- int j;
+ if (!newn)
+ goto nomem;
- for(j = 0; j < size; j++)
- if (tn->child[j])
- tnode_free((struct tnode *)tn->child[j]);
+ put_child(t, tn, i/2, (struct node *)newn);
+ }
- tnode_free(tn);
-
- *err = -ENOMEM;
- return oldtnode;
}
- for(i = 0; i < olen; i += 2) {
+ for (i = 0; i < olen; i += 2) {
+ struct tnode *newBinNode;
+
left = tnode_get_child(oldtnode, i);
right = tnode_get_child(oldtnode, i+1);
if (right == NULL) /* Both are empty */
continue;
put_child(t, tn, i/2, right);
- } else if (right == NULL)
+ continue;
+ }
+
+ if (right == NULL) {
put_child(t, tn, i/2, left);
+ continue;
+ }
/* Two nonempty children */
- else {
- struct tnode *newBinNode =
- (struct tnode *) tnode_get_child(tn, i/2);
- put_child(t, tn, i/2, NULL);
-
- if (!newBinNode)
- BUG();
-
- put_child(t, newBinNode, 0, left);
- put_child(t, newBinNode, 1, right);
- put_child(t, tn, i/2, resize(t, newBinNode));
- }
+ newBinNode = (struct tnode *) tnode_get_child(tn, i/2);
+ put_child(t, tn, i/2, NULL);
+ put_child(t, newBinNode, 0, left);
+ put_child(t, newBinNode, 1, right);
+ put_child(t, tn, i/2, resize(t, newBinNode));
}
tnode_free(oldtnode);
return tn;
+nomem:
+ {
+ int size = tnode_child_length(tn);
+ int j;
+
+ for (j = 0; j < size; j++)
+ if (tn->child[j])
+ tnode_free((struct tnode *)tn->child[j]);
+
+ tnode_free(tn);
+
+ return ERR_PTR(-ENOMEM);
+ }
}
-static void *trie_init(struct trie *t)
+static void trie_init(struct trie *t)
{
- if (t) {
- t->size = 0;
- t->trie = NULL;
- t->revision = 0;
+ if (!t)
+ return;
+
+ t->size = 0;
+ rcu_assign_pointer(t->trie, NULL);
+ t->revision = 0;
#ifdef CONFIG_IP_FIB_TRIE_STATS
- memset(&t->stats, 0, sizeof(struct trie_use_stats));
+ memset(&t->stats, 0, sizeof(struct trie_use_stats));
#endif
- }
- return t;
}
+/* readside most use rcu_read_lock currently dump routines
+ via get_fa_head and dump */
+
static struct leaf_info *find_leaf_info(struct hlist_head *head, int plen)
{
struct hlist_node *node;
struct leaf_info *li;
- hlist_for_each_entry(li, node, head, hlist) {
+ hlist_for_each_entry_rcu(li, node, head, hlist)
if (li->plen == plen)
return li;
- }
+
return NULL;
}
static inline struct list_head * get_fa_head(struct leaf *l, int plen)
{
- struct list_head *fa_head = NULL;
struct leaf_info *li = find_leaf_info(&l->list, plen);
- if (li)
- fa_head = &li->falh;
+ if (!li)
+ return NULL;
- return fa_head;
+ return &li->falh;
}
static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new)
{
- struct leaf_info *li = NULL, *last = NULL;
- struct hlist_node *node, *tmp;
-
- write_lock_bh(&fib_lock);
-
- if (hlist_empty(head))
- hlist_add_head(&new->hlist, head);
- else {
- hlist_for_each_entry_safe(li, node, tmp, head, hlist) {
-
- if (new->plen > li->plen)
- break;
-
- last = li;
- }
- if (last)
- hlist_add_after(&last->hlist, &new->hlist);
- else
- hlist_add_before(&new->hlist, &li->hlist);
- }
- write_unlock_bh(&fib_lock);
+ struct leaf_info *li = NULL, *last = NULL;
+ struct hlist_node *node;
+
+ if (hlist_empty(head)) {
+ hlist_add_head_rcu(&new->hlist, head);
+ } else {
+ hlist_for_each_entry(li, node, head, hlist) {
+ if (new->plen > li->plen)
+ break;
+
+ last = li;
+ }
+ if (last)
+ hlist_add_after_rcu(&last->hlist, &new->hlist);
+ else
+ hlist_add_before_rcu(&new->hlist, &li->hlist);
+ }
}
+/* rcu_read_lock needs to be hold by caller from readside */
+
static struct leaf *
fib_find_node(struct trie *t, u32 key)
{
struct node *n;
pos = 0;
- n = t->trie;
+ n = rcu_dereference(t->trie);
while (n != NULL && NODE_TYPE(n) == T_TNODE) {
tn = (struct tnode *) n;
-
+
check_tnode(tn);
-
+
if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) {
- pos=tn->pos + tn->bits;
+ pos = tn->pos + tn->bits;
n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits));
- }
- else
+ } else
break;
}
/* Case we have found a leaf. Compare prefixes */
- if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) {
- struct leaf *l = (struct leaf *) n;
- return l;
- }
+ if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key))
+ return (struct leaf *)n;
+
return NULL;
}
static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
{
- int i = 0;
int wasfull;
t_key cindex, key;
struct tnode *tp = NULL;
- if (!tn)
- BUG();
-
key = tn->key;
- i = 0;
while (tn != NULL && NODE_PARENT(tn) != NULL) {
- if (i > 10) {
- printk("Rebalance tn=%p \n", tn);
- if (tn) printk("tn->parent=%p \n", NODE_PARENT(tn));
-
- printk("Rebalance tp=%p \n", tp);
- if (tp) printk("tp->parent=%p \n", NODE_PARENT(tp));
- }
-
- if (i > 12) BUG();
- i++;
-
tp = NODE_PARENT(tn);
cindex = tkey_extract_bits(key, tp->pos, tp->bits);
wasfull = tnode_full(tp, tnode_get_child(tp, cindex));
tn = (struct tnode *) resize (t, (struct tnode *)tn);
tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull);
-
+
if (!NODE_PARENT(tn))
break;
return (struct node*) tn;
}
+/* only used from updater-side */
+
static struct list_head *
fib_insert_node(struct trie *t, int *err, u32 key, int plen)
{
while (n != NULL && NODE_TYPE(n) == T_TNODE) {
tn = (struct tnode *) n;
-
+
check_tnode(tn);
-
+
if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) {
tp = tn;
- pos=tn->pos + tn->bits;
+ pos = tn->pos + tn->bits;
n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits));
- if (n && NODE_PARENT(n) != tn) {
- printk("BUG tn=%p, n->parent=%p\n", tn, NODE_PARENT(n));
- BUG();
- }
- }
- else
+ BUG_ON(n && NODE_PARENT(n) != tn);
+ } else
break;
}
* tp is n's (parent) ----> NULL or TNODE
*/
- if (tp && IS_LEAF(tp))
- BUG();
-
+ BUG_ON(tp && IS_LEAF(tp));
/* Case 1: n is a leaf. Compare prefixes */
if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) {
- struct leaf *l = ( struct leaf *) n;
-
+ struct leaf *l = (struct leaf *) n;
+
li = leaf_info_new(plen);
-
+
if (!li) {
*err = -ENOMEM;
goto err;
fa_head = &li->falh;
insert_leaf_info(&l->list, li);
- /* Case 2: n is NULL, and will just insert a new leaf */
if (t->trie && n == NULL) {
+ /* Case 2: n is NULL, and will just insert a new leaf */
NODE_SET_PARENT(l, tp);
-
- if (!tp)
- BUG();
- else {
- cindex = tkey_extract_bits(key, tp->pos, tp->bits);
- put_child(t, (struct tnode *)tp, cindex, (struct node *)l);
- }
- }
- /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */
- else {
+ cindex = tkey_extract_bits(key, tp->pos, tp->bits);
+ put_child(t, (struct tnode *)tp, cindex, (struct node *)l);
+ } else {
+ /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */
/*
* Add a new tnode here
* first tnode need some special handling
*/
if (tp)
- pos=tp->pos+tp->bits;
+ pos = tp->pos+tp->bits;
else
- pos=0;
+ pos = 0;
+
if (n) {
newpos = tkey_mismatch(key, pos, n->key);
tn = tnode_new(n->key, newpos, 1);
- }
- else {
+ } else {
newpos = 0;
tn = tnode_new(key, newpos, 1); /* First tnode */
}
tnode_free((struct tnode *) l);
*err = -ENOMEM;
goto err;
- }
-
+ }
+
NODE_SET_PARENT(tn, tp);
- missbit=tkey_extract_bits(key, newpos, 1);
+ missbit = tkey_extract_bits(key, newpos, 1);
put_child(t, tn, missbit, (struct node *)l);
put_child(t, tn, 1-missbit, n);
if (tp) {
cindex = tkey_extract_bits(key, tp->pos, tp->bits);
put_child(t, (struct tnode *)tp, cindex, (struct node *)tn);
- }
- else {
- t->trie = (struct node*) tn; /* First tnode */
+ } else {
+ rcu_assign_pointer(t->trie, (struct node *)tn); /* First tnode */
tp = tn;
}
}
- if (tp && tp->pos+tp->bits > 32) {
+
+ if (tp && tp->pos + tp->bits > 32)
printk("ERROR tp=%p pos=%d, bits=%d, key=%0x plen=%d\n",
tp, tp->pos, tp->bits, key, plen);
- }
+
/* Rebalance the trie */
- t->trie = trie_rebalance(t, tp);
+
+ rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
done:
t->revision++;
-err:;
+err:
return fa_head;
}
key = ntohl(key);
- if (trie_debug)
- printk("Insert table=%d %08x/%d\n", tb->tb_id, key, plen);
+ pr_debug("Insert table=%d %08x/%d\n", tb->tb_id, key, plen);
- mask = ntohl( inet_make_mask(plen) );
+ mask = ntohl(inet_make_mask(plen));
if (key & ~mask)
return -EINVAL;
key = key & mask;
- if ((fi = fib_create_info(r, rta, nlhdr, &err)) == NULL)
+ fi = fib_create_info(r, rta, nlhdr, &err);
+
+ if (!fi)
goto err;
l = fib_find_node(t, key);
* and we need to allocate a new one of those as well.
*/
- if (fa &&
- fa->fa_info->fib_priority == fi->fib_priority) {
+ if (fa && fa->fa_info->fib_priority == fi->fib_priority) {
struct fib_alias *fa_orig;
err = -EEXIST;
struct fib_info *fi_drop;
u8 state;
- write_lock_bh(&fib_lock);
+ err = -ENOBUFS;
+ new_fa = kmem_cache_alloc(fn_alias_kmem, SLAB_KERNEL);
+ if (new_fa == NULL)
+ goto out;
fi_drop = fa->fa_info;
- fa->fa_info = fi;
- fa->fa_type = type;
- fa->fa_scope = r->rtm_scope;
+ new_fa->fa_tos = fa->fa_tos;
+ new_fa->fa_info = fi;
+ new_fa->fa_type = type;
+ new_fa->fa_scope = r->rtm_scope;
state = fa->fa_state;
- fa->fa_state &= ~FA_S_ACCESSED;
+ new_fa->fa_state &= ~FA_S_ACCESSED;
- write_unlock_bh(&fib_lock);
+ list_replace_rcu(&fa->fa_list, &new_fa->fa_list);
+ alias_free_mem_rcu(fa);
fib_release_info(fi_drop);
if (state & FA_S_ACCESSED)
- rt_cache_flush(-1);
+ rt_cache_flush(-1);
- goto succeeded;
+ goto succeeded;
}
/* Error if we find a perfect match which
* uses the same scope, type, and nexthop
fa = fa_orig;
}
err = -ENOENT;
- if (!(nlhdr->nlmsg_flags&NLM_F_CREATE))
+ if (!(nlhdr->nlmsg_flags & NLM_F_CREATE))
goto out;
err = -ENOBUFS;
new_fa->fa_type = type;
new_fa->fa_scope = r->rtm_scope;
new_fa->fa_state = 0;
-#if 0
- new_fa->dst = NULL;
-#endif
/*
* Insert new entry to the list.
*/
goto out_free_new_fa;
}
- write_lock_bh(&fib_lock);
-
- list_add_tail(&new_fa->fa_list,
- (fa ? &fa->fa_list : fa_head));
-
- write_unlock_bh(&fib_lock);
+ list_add_tail_rcu(&new_fa->fa_list,
+ (fa ? &fa->fa_list : fa_head));
rt_cache_flush(-1);
rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, nlhdr, req);
kmem_cache_free(fn_alias_kmem, new_fa);
out:
fib_release_info(fi);
-err:;
+err:
return err;
}
-static inline int check_leaf(struct trie *t, struct leaf *l, t_key key, int *plen, const struct flowi *flp,
- struct fib_result *res, int *err)
+
+/* should be clalled with rcu_read_lock */
+static inline int check_leaf(struct trie *t, struct leaf *l,
+ t_key key, int *plen, const struct flowi *flp,
+ struct fib_result *res)
{
- int i;
+ int err, i;
t_key mask;
struct leaf_info *li;
struct hlist_head *hhead = &l->list;
struct hlist_node *node;
- hlist_for_each_entry(li, node, hhead, hlist) {
-
+ hlist_for_each_entry_rcu(li, node, hhead, hlist) {
i = li->plen;
mask = ntohl(inet_make_mask(i));
if (l->key != (key & mask))
continue;
- if (((*err) = fib_semantic_match(&li->falh, flp, res, l->key, mask, i)) == 0) {
+ if ((err = fib_semantic_match(&li->falh, flp, res, l->key, mask, i)) <= 0) {
*plen = i;
#ifdef CONFIG_IP_FIB_TRIE_STATS
t->stats.semantic_match_passed++;
#endif
- return 1;
+ return err;
}
#ifdef CONFIG_IP_FIB_TRIE_STATS
t->stats.semantic_match_miss++;
#endif
}
- return 0;
+ return 1;
}
static int
struct node *n;
struct tnode *pn;
int pos, bits;
- t_key key=ntohl(flp->fl4_dst);
+ t_key key = ntohl(flp->fl4_dst);
int chopped_off;
t_key cindex = 0;
int current_prefix_length = KEYLENGTH;
- n = t->trie;
+ struct tnode *cn;
+ t_key node_prefix, key_prefix, pref_mismatch;
+ int mp;
- read_lock(&fib_lock);
+ rcu_read_lock();
+
+ n = rcu_dereference(t->trie);
if (!n)
goto failed;
/* Just a leaf? */
if (IS_LEAF(n)) {
- if (check_leaf(t, (struct leaf *)n, key, &plen, flp, res, &ret))
+ if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0)
goto found;
goto failed;
}
pn = (struct tnode *) n;
chopped_off = 0;
- while (pn) {
-
+ while (pn) {
pos = pn->pos;
bits = pn->bits;
goto backtrace;
}
- if (IS_TNODE(n)) {
+ if (IS_LEAF(n)) {
+ if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0)
+ goto found;
+ else
+ goto backtrace;
+ }
+
#define HL_OPTIMIZE
#ifdef HL_OPTIMIZE
- struct tnode *cn = (struct tnode *)n;
- t_key node_prefix, key_prefix, pref_mismatch;
- int mp;
-
- /*
- * It's a tnode, and we can do some extra checks here if we
- * like, to avoid descending into a dead-end branch.
- * This tnode is in the parent's child array at index
- * key[p_pos..p_pos+p_bits] but potentially with some bits
- * chopped off, so in reality the index may be just a
- * subprefix, padded with zero at the end.
- * We can also take a look at any skipped bits in this
- * tnode - everything up to p_pos is supposed to be ok,
- * and the non-chopped bits of the index (se previous
- * paragraph) are also guaranteed ok, but the rest is
- * considered unknown.
- *
- * The skipped bits are key[pos+bits..cn->pos].
- */
-
- /* If current_prefix_length < pos+bits, we are already doing
- * actual prefix matching, which means everything from
- * pos+(bits-chopped_off) onward must be zero along some
- * branch of this subtree - otherwise there is *no* valid
- * prefix present. Here we can only check the skipped
- * bits. Remember, since we have already indexed into the
- * parent's child array, we know that the bits we chopped of
- * *are* zero.
- */
-
- /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */
-
- if (current_prefix_length < pos+bits) {
- if (tkey_extract_bits(cn->key, current_prefix_length,
- cn->pos - current_prefix_length) != 0 ||
- !(cn->child[0]))
- goto backtrace;
- }
+ cn = (struct tnode *)n;
+
+ /*
+ * It's a tnode, and we can do some extra checks here if we
+ * like, to avoid descending into a dead-end branch.
+ * This tnode is in the parent's child array at index
+ * key[p_pos..p_pos+p_bits] but potentially with some bits
+ * chopped off, so in reality the index may be just a
+ * subprefix, padded with zero at the end.
+ * We can also take a look at any skipped bits in this
+ * tnode - everything up to p_pos is supposed to be ok,
+ * and the non-chopped bits of the index (se previous
+ * paragraph) are also guaranteed ok, but the rest is
+ * considered unknown.
+ *
+ * The skipped bits are key[pos+bits..cn->pos].
+ */
+
+ /* If current_prefix_length < pos+bits, we are already doing
+ * actual prefix matching, which means everything from
+ * pos+(bits-chopped_off) onward must be zero along some
+ * branch of this subtree - otherwise there is *no* valid
+ * prefix present. Here we can only check the skipped
+ * bits. Remember, since we have already indexed into the
+ * parent's child array, we know that the bits we chopped of
+ * *are* zero.
+ */
+
+ /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */
+
+ if (current_prefix_length < pos+bits) {
+ if (tkey_extract_bits(cn->key, current_prefix_length,
+ cn->pos - current_prefix_length) != 0 ||
+ !(cn->child[0]))
+ goto backtrace;
+ }
+
+ /*
+ * If chopped_off=0, the index is fully validated and we
+ * only need to look at the skipped bits for this, the new,
+ * tnode. What we actually want to do is to find out if
+ * these skipped bits match our key perfectly, or if we will
+ * have to count on finding a matching prefix further down,
+ * because if we do, we would like to have some way of
+ * verifying the existence of such a prefix at this point.
+ */
+
+ /* The only thing we can do at this point is to verify that
+ * any such matching prefix can indeed be a prefix to our
+ * key, and if the bits in the node we are inspecting that
+ * do not match our key are not ZERO, this cannot be true.
+ * Thus, find out where there is a mismatch (before cn->pos)
+ * and verify that all the mismatching bits are zero in the
+ * new tnode's key.
+ */
+
+ /* Note: We aren't very concerned about the piece of the key
+ * that precede pn->pos+pn->bits, since these have already been
+ * checked. The bits after cn->pos aren't checked since these are
+ * by definition "unknown" at this point. Thus, what we want to
+ * see is if we are about to enter the "prefix matching" state,
+ * and in that case verify that the skipped bits that will prevail
+ * throughout this subtree are zero, as they have to be if we are
+ * to find a matching prefix.
+ */
+
+ node_prefix = MASK_PFX(cn->key, cn->pos);
+ key_prefix = MASK_PFX(key, cn->pos);
+ pref_mismatch = key_prefix^node_prefix;
+ mp = 0;
+
+ /* In short: If skipped bits in this node do not match the search
+ * key, enter the "prefix matching" state.directly.
+ */
+ if (pref_mismatch) {
+ while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) {
+ mp++;
+ pref_mismatch = pref_mismatch <<1;
+ }
+ key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp);
+
+ if (key_prefix != 0)
+ goto backtrace;
+
+ if (current_prefix_length >= cn->pos)
+ current_prefix_length = mp;
+ }
+#endif
+ pn = (struct tnode *)n; /* Descend */
+ chopped_off = 0;
+ continue;
- /*
- * If chopped_off=0, the index is fully validated and we
- * only need to look at the skipped bits for this, the new,
- * tnode. What we actually want to do is to find out if
- * these skipped bits match our key perfectly, or if we will
- * have to count on finding a matching prefix further down,
- * because if we do, we would like to have some way of
- * verifying the existence of such a prefix at this point.
- */
-
- /* The only thing we can do at this point is to verify that
- * any such matching prefix can indeed be a prefix to our
- * key, and if the bits in the node we are inspecting that
- * do not match our key are not ZERO, this cannot be true.
- * Thus, find out where there is a mismatch (before cn->pos)
- * and verify that all the mismatching bits are zero in the
- * new tnode's key.
- */
-
- /* Note: We aren't very concerned about the piece of the key
- * that precede pn->pos+pn->bits, since these have already been
- * checked. The bits after cn->pos aren't checked since these are
- * by definition "unknown" at this point. Thus, what we want to
- * see is if we are about to enter the "prefix matching" state,
- * and in that case verify that the skipped bits that will prevail
- * throughout this subtree are zero, as they have to be if we are
- * to find a matching prefix.
- */
-
- node_prefix = MASK_PFX(cn->key, cn->pos);
- key_prefix = MASK_PFX(key, cn->pos);
- pref_mismatch = key_prefix^node_prefix;
- mp = 0;
-
- /* In short: If skipped bits in this node do not match the search
- * key, enter the "prefix matching" state.directly.
- */
- if (pref_mismatch) {
- while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) {
- mp++;
- pref_mismatch = pref_mismatch <<1;
- }
- key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp);
-
- if (key_prefix != 0)
- goto backtrace;
-
- if (current_prefix_length >= cn->pos)
- current_prefix_length=mp;
- }
-#endif
- pn = (struct tnode *)n; /* Descend */
- chopped_off = 0;
- continue;
- }
- if (IS_LEAF(n)) {
- if (check_leaf(t, (struct leaf *)n, key, &plen, flp, res, &ret))
- goto found;
- }
backtrace:
chopped_off++;
/* As zero don't change the child key (cindex) */
- while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1)))) {
+ while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1))))
chopped_off++;
- }
/* Decrease current_... with bits chopped off */
if (current_prefix_length > pn->pos + pn->bits - chopped_off)
current_prefix_length = pn->pos + pn->bits - chopped_off;
-
+
/*
* Either we do the actual chop off according or if we have
* chopped off all bits in this tnode walk up to our parent.
*/
- if (chopped_off <= pn->bits)
+ if (chopped_off <= pn->bits) {
cindex &= ~(1 << (chopped_off-1));
- else {
+ } else {
if (NODE_PARENT(pn) == NULL)
goto failed;
-
+
/* Get Child's index */
cindex = tkey_extract_bits(pn->key, NODE_PARENT(pn)->pos, NODE_PARENT(pn)->bits);
pn = NODE_PARENT(pn);
failed:
ret = 1;
found:
- read_unlock(&fib_lock);
+ rcu_read_unlock();
return ret;
}
+/* only called from updater side */
static int trie_leaf_remove(struct trie *t, t_key key)
{
t_key cindex;
struct node *n = t->trie;
struct leaf *l;
- if (trie_debug)
- printk("entering trie_leaf_remove(%p)\n", n);
+ pr_debug("entering trie_leaf_remove(%p)\n", n);
/* Note that in the case skipped bits, those bits are *not* checked!
* When we finish this, we will have NULL or a T_LEAF, and the
* T_LEAF may or may not match our key.
*/
- while (n != NULL && IS_TNODE(n)) {
+ while (n != NULL && IS_TNODE(n)) {
struct tnode *tn = (struct tnode *) n;
check_tnode(tn);
n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits));
- if (n && NODE_PARENT(n) != tn) {
- printk("BUG tn=%p, n->parent=%p\n", tn, NODE_PARENT(n));
- BUG();
- }
- }
+ BUG_ON(n && NODE_PARENT(n) != tn);
+ }
l = (struct leaf *) n;
if (!n || !tkey_equals(l->key, key))
t->revision++;
t->size--;
+ preempt_disable();
tp = NODE_PARENT(n);
tnode_free((struct tnode *) n);
if (tp) {
cindex = tkey_extract_bits(key, tp->pos, tp->bits);
put_child(t, (struct tnode *)tp, cindex, NULL);
- t->trie = trie_rebalance(t, tp);
- }
- else
- t->trie = NULL;
+ rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
+ } else
+ rcu_assign_pointer(t->trie, NULL);
+ preempt_enable();
return 1;
}
static int
fn_trie_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
- struct nlmsghdr *nlhdr, struct netlink_skb_parms *req)
+ struct nlmsghdr *nlhdr, struct netlink_skb_parms *req)
{
struct trie *t = (struct trie *) tb->tb_data;
u32 key, mask;
struct fib_alias *fa, *fa_to_delete;
struct list_head *fa_head;
struct leaf *l;
+ struct leaf_info *li;
+
if (plen > 32)
return -EINVAL;
memcpy(&key, rta->rta_dst, 4);
key = ntohl(key);
- mask = ntohl( inet_make_mask(plen) );
+ mask = ntohl(inet_make_mask(plen));
if (key & ~mask)
return -EINVAL;
if (!fa)
return -ESRCH;
- if (trie_debug)
- printk("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t);
+ pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t);
fa_to_delete = NULL;
fa_head = fa->fa_list.prev;
+
list_for_each_entry(fa, fa_head, fa_list) {
struct fib_info *fi = fa->fa_info;
}
}
- if (fa_to_delete) {
- int kill_li = 0;
- struct leaf_info *li;
-
- fa = fa_to_delete;
- rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, nlhdr, req);
+ if (!fa_to_delete)
+ return -ESRCH;
- l = fib_find_node(t, key);
- li = find_leaf_info(&l->list, plen);
+ fa = fa_to_delete;
+ rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, nlhdr, req);
- write_lock_bh(&fib_lock);
+ l = fib_find_node(t, key);
+ li = find_leaf_info(&l->list, plen);
- list_del(&fa->fa_list);
+ list_del_rcu(&fa->fa_list);
- if (list_empty(fa_head)) {
- hlist_del(&li->hlist);
- kill_li = 1;
- }
- write_unlock_bh(&fib_lock);
-
- if (kill_li)
- free_leaf_info(li);
+ if (list_empty(fa_head)) {
+ hlist_del_rcu(&li->hlist);
+ free_leaf_info(li);
+ }
- if (hlist_empty(&l->list))
- trie_leaf_remove(t, key);
+ if (hlist_empty(&l->list))
+ trie_leaf_remove(t, key);
- if (fa->fa_state & FA_S_ACCESSED)
- rt_cache_flush(-1);
+ if (fa->fa_state & FA_S_ACCESSED)
+ rt_cache_flush(-1);
- fn_free_alias(fa);
- return 0;
- }
- return -ESRCH;
+ fib_release_info(fa->fa_info);
+ alias_free_mem_rcu(fa);
+ return 0;
}
static int trie_flush_list(struct trie *t, struct list_head *head)
list_for_each_entry_safe(fa, fa_node, head, fa_list) {
struct fib_info *fi = fa->fa_info;
-
- if (fi && (fi->fib_flags&RTNH_F_DEAD)) {
- write_lock_bh(&fib_lock);
- list_del(&fa->fa_list);
- write_unlock_bh(&fib_lock);
-
- fn_free_alias(fa);
+ if (fi && (fi->fib_flags & RTNH_F_DEAD)) {
+ list_del_rcu(&fa->fa_list);
+ fib_release_info(fa->fa_info);
+ alias_free_mem_rcu(fa);
found++;
}
}
struct leaf_info *li = NULL;
hlist_for_each_entry_safe(li, node, tmp, lih, hlist) {
-
found += trie_flush_list(t, &li->falh);
if (list_empty(&li->falh)) {
-
- write_lock_bh(&fib_lock);
- hlist_del(&li->hlist);
- write_unlock_bh(&fib_lock);
-
+ hlist_del_rcu(&li->hlist);
free_leaf_info(li);
}
}
return found;
}
+/* rcu_read_lock needs to be hold by caller from readside */
+
static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf)
{
struct node *c = (struct node *) thisleaf;
struct tnode *p;
int idx;
+ struct node *trie = rcu_dereference(t->trie);
if (c == NULL) {
- if (t->trie == NULL)
+ if (trie == NULL)
return NULL;
- if (IS_LEAF(t->trie)) /* trie w. just a leaf */
- return (struct leaf *) t->trie;
+ if (IS_LEAF(trie)) /* trie w. just a leaf */
+ return (struct leaf *) trie;
- p = (struct tnode*) t->trie; /* Start */
- }
- else
+ p = (struct tnode*) trie; /* Start */
+ } else
p = (struct tnode *) NODE_PARENT(c);
while (p) {
pos = 0;
last = 1 << p->bits;
- for(idx = pos; idx < last ; idx++) {
- if (p->child[idx]) {
-
- /* Decend if tnode */
-
- while (IS_TNODE(p->child[idx])) {
- p = (struct tnode*) p->child[idx];
- idx = 0;
-
- /* Rightmost non-NULL branch */
- if (p && IS_TNODE(p))
- while (p->child[idx] == NULL && idx < (1 << p->bits)) idx++;
-
- /* Done with this tnode? */
- if (idx >= (1 << p->bits) || p->child[idx] == NULL )
- goto up;
- }
- return (struct leaf*) p->child[idx];
+ for (idx = pos; idx < last ; idx++) {
+ c = rcu_dereference(p->child[idx]);
+
+ if (!c)
+ continue;
+
+ /* Decend if tnode */
+ while (IS_TNODE(c)) {
+ p = (struct tnode *) c;
+ idx = 0;
+
+ /* Rightmost non-NULL branch */
+ if (p && IS_TNODE(p))
+ while (!(c = rcu_dereference(p->child[idx]))
+ && idx < (1<<p->bits)) idx++;
+
+ /* Done with this tnode? */
+ if (idx >= (1 << p->bits) || !c)
+ goto up;
}
+ return (struct leaf *) c;
}
up:
/* No more children go up one step */
- c = (struct node*) p;
+ c = (struct node *) p;
p = (struct tnode *) NODE_PARENT(p);
}
return NULL; /* Ready. Root of trie */
t->revision++;
- for (h=0; (l = nextleaf(t, l)) != NULL; h++) {
+ rcu_read_lock();
+ for (h = 0; (l = nextleaf(t, l)) != NULL; h++) {
found += trie_flush_leaf(t, l);
if (ll && hlist_empty(&ll->list))
trie_leaf_remove(t, ll->key);
ll = l;
}
+ rcu_read_unlock();
if (ll && hlist_empty(&ll->list))
trie_leaf_remove(t, ll->key);
- if (trie_debug)
- printk("trie_flush found=%d\n", found);
+ pr_debug("trie_flush found=%d\n", found);
return found;
}
-static int trie_last_dflt=-1;
+static int trie_last_dflt = -1;
static void
fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
last_resort = NULL;
order = -1;
- read_lock(&fib_lock);
+ rcu_read_lock();
l = fib_find_node(t, 0);
if (!l)
if (list_empty(fa_head))
goto out;
- list_for_each_entry(fa, fa_head, fa_list) {
+ list_for_each_entry_rcu(fa, fa_head, fa_list) {
struct fib_info *next_fi = fa->fa_info;
-
+
if (fa->fa_scope != res->scope ||
fa->fa_type != RTN_UNICAST)
continue;
-
+
if (next_fi->fib_priority > res->fi->fib_priority)
break;
if (!next_fi->fib_nh[0].nh_gw ||
next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
continue;
fa->fa_state |= FA_S_ACCESSED;
-
+
if (fi == NULL) {
if (next_fi != res->fi)
break;
}
trie_last_dflt = last_idx;
out:;
- read_unlock(&fib_lock);
+ rcu_read_unlock();
}
static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, struct fib_table *tb,
int i, s_i;
struct fib_alias *fa;
- u32 xkey=htonl(key);
+ u32 xkey = htonl(key);
- s_i=cb->args[3];
+ s_i = cb->args[3];
i = 0;
- list_for_each_entry(fa, fah, fa_list) {
+ /* rcu_read_lock is hold by caller */
+
+ list_for_each_entry_rcu(fa, fah, fa_list) {
if (i < s_i) {
i++;
continue;
fa->fa_info, 0) < 0) {
cb->args[3] = i;
return -1;
- }
+ }
i++;
}
- cb->args[3]=i;
+ cb->args[3] = i;
return skb->len;
}
int h, s_h;
struct list_head *fa_head;
struct leaf *l = NULL;
- s_h=cb->args[2];
- for (h=0; (l = nextleaf(t, l)) != NULL; h++) {
+ s_h = cb->args[2];
+ for (h = 0; (l = nextleaf(t, l)) != NULL; h++) {
if (h < s_h)
continue;
if (h > s_h)
sizeof(cb->args) - 3*sizeof(cb->args[0]));
fa_head = get_fa_head(l, plen);
-
+
if (!fa_head)
continue;
continue;
if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb)<0) {
- cb->args[2]=h;
+ cb->args[2] = h;
return -1;
}
}
- cb->args[2]=h;
+ cb->args[2] = h;
return skb->len;
}
s_m = cb->args[1];
- read_lock(&fib_lock);
- for (m=0; m<=32; m++) {
-
+ rcu_read_lock();
+ for (m = 0; m <= 32; m++) {
if (m < s_m)
continue;
if (m > s_m)
memset(&cb->args[2], 0,
- sizeof(cb->args) - 2*sizeof(cb->args[0]));
+ sizeof(cb->args) - 2*sizeof(cb->args[0]));
if (fn_trie_dump_plen(t, 32-m, tb, skb, cb)<0) {
cb->args[1] = m;
goto out;
}
}
- read_unlock(&fib_lock);
+ rcu_read_unlock();
cb->args[1] = m;
return skb->len;
- out:
- read_unlock(&fib_lock);
+out:
+ rcu_read_unlock();
return -1;
}
trie_init(t);
if (id == RT_TABLE_LOCAL)
- trie_local = t;
+ trie_local = t;
else if (id == RT_TABLE_MAIN)
- trie_main = t;
+ trie_main = t;
if (id == RT_TABLE_LOCAL)
printk("IPv4 FIB: Using LC-trie version %s\n", VERSION);
return tb;
}
-/* Trie dump functions */
+#ifdef CONFIG_PROC_FS
+/* Depth first Trie walk iterator */
+struct fib_trie_iter {
+ struct tnode *tnode;
+ struct trie *trie;
+ unsigned index;
+ unsigned depth;
+};
-static void putspace_seq(struct seq_file *seq, int n)
+static struct node *fib_trie_get_next(struct fib_trie_iter *iter)
{
- while (n--) seq_printf(seq, " ");
-}
+ struct tnode *tn = iter->tnode;
+ unsigned cindex = iter->index;
+ struct tnode *p;
-static void printbin_seq(struct seq_file *seq, unsigned int v, int bits)
-{
- while (bits--)
- seq_printf(seq, "%s", (v & (1<<bits))?"1":"0");
-}
+ pr_debug("get_next iter={node=%p index=%d depth=%d}\n",
+ iter->tnode, iter->index, iter->depth);
+rescan:
+ while (cindex < (1<<tn->bits)) {
+ struct node *n = tnode_get_child(tn, cindex);
-static void printnode_seq(struct seq_file *seq, int indent, struct node *n,
- int pend, int cindex, int bits)
-{
- putspace_seq(seq, indent);
- if (IS_LEAF(n))
- seq_printf(seq, "|");
- else
- seq_printf(seq, "+");
- if (bits) {
- seq_printf(seq, "%d/", cindex);
- printbin_seq(seq, cindex, bits);
- seq_printf(seq, ": ");
- }
- else
- seq_printf(seq, "<root>: ");
- seq_printf(seq, "%s:%p ", IS_LEAF(n)?"Leaf":"Internal node", n);
-
- if (IS_LEAF(n))
- seq_printf(seq, "key=%d.%d.%d.%d\n",
- n->key >> 24, (n->key >> 16) % 256, (n->key >> 8) % 256, n->key % 256);
- else {
- int plen = ((struct tnode *)n)->pos;
- t_key prf=MASK_PFX(n->key, plen);
- seq_printf(seq, "key=%d.%d.%d.%d/%d\n",
- prf >> 24, (prf >> 16) % 256, (prf >> 8) % 256, prf % 256, plen);
- }
- if (IS_LEAF(n)) {
- struct leaf *l=(struct leaf *)n;
- struct fib_alias *fa;
- int i;
- for (i=32; i>=0; i--)
- if (find_leaf_info(&l->list, i)) {
-
- struct list_head *fa_head = get_fa_head(l, i);
-
- if (!fa_head)
- continue;
-
- if (list_empty(fa_head))
- continue;
-
- putspace_seq(seq, indent+2);
- seq_printf(seq, "{/%d...dumping}\n", i);
-
-
- list_for_each_entry(fa, fa_head, fa_list) {
- putspace_seq(seq, indent+2);
- if (fa->fa_info->fib_nh == NULL) {
- seq_printf(seq, "Error _fib_nh=NULL\n");
- continue;
- }
- if (fa->fa_info == NULL) {
- seq_printf(seq, "Error fa_info=NULL\n");
- continue;
- }
-
- seq_printf(seq, "{type=%d scope=%d TOS=%d}\n",
- fa->fa_type,
- fa->fa_scope,
- fa->fa_tos);
- }
- }
- }
- else if (IS_TNODE(n)) {
- struct tnode *tn = (struct tnode *)n;
- putspace_seq(seq, indent); seq_printf(seq, "| ");
- seq_printf(seq, "{key prefix=%08x/", tn->key&TKEY_GET_MASK(0, tn->pos));
- printbin_seq(seq, tkey_extract_bits(tn->key, 0, tn->pos), tn->pos);
- seq_printf(seq, "}\n");
- putspace_seq(seq, indent); seq_printf(seq, "| ");
- seq_printf(seq, "{pos=%d", tn->pos);
- seq_printf(seq, " (skip=%d bits)", tn->pos - pend);
- seq_printf(seq, " bits=%d (%u children)}\n", tn->bits, (1 << tn->bits));
- putspace_seq(seq, indent); seq_printf(seq, "| ");
- seq_printf(seq, "{empty=%d full=%d}\n", tn->empty_children, tn->full_children);
- }
-}
-
-static void trie_dump_seq(struct seq_file *seq, struct trie *t)
-{
- struct node *n = t->trie;
- int cindex=0;
- int indent=1;
- int pend=0;
- int depth = 0;
-
- read_lock(&fib_lock);
-
- seq_printf(seq, "------ trie_dump of t=%p ------\n", t);
- if (n) {
- printnode_seq(seq, indent, n, pend, cindex, 0);
- if (IS_TNODE(n)) {
- struct tnode *tn = (struct tnode *)n;
- pend = tn->pos+tn->bits;
- putspace_seq(seq, indent); seq_printf(seq, "\\--\n");
- indent += 3;
- depth++;
-
- while (tn && cindex < (1 << tn->bits)) {
- if (tn->child[cindex]) {
-
- /* Got a child */
-
- printnode_seq(seq, indent, tn->child[cindex], pend, cindex, tn->bits);
- if (IS_LEAF(tn->child[cindex])) {
- cindex++;
-
- }
- else {
- /*
- * New tnode. Decend one level
- */
-
- depth++;
- n = tn->child[cindex];
- tn = (struct tnode *)n;
- pend = tn->pos+tn->bits;
- putspace_seq(seq, indent); seq_printf(seq, "\\--\n");
- indent+=3;
- cindex=0;
- }
- }
- else
- cindex++;
-
- /*
- * Test if we are done
- */
-
- while (cindex >= (1 << tn->bits)) {
-
- /*
- * Move upwards and test for root
- * pop off all traversed nodes
- */
-
- if (NODE_PARENT(tn) == NULL) {
- tn = NULL;
- n = NULL;
- break;
- }
- else {
- cindex = tkey_extract_bits(tn->key, NODE_PARENT(tn)->pos, NODE_PARENT(tn)->bits);
- tn = NODE_PARENT(tn);
- cindex++;
- n = (struct node *)tn;
- pend = tn->pos+tn->bits;
- indent-=3;
- depth--;
- }
- }
+ if (n) {
+ if (IS_LEAF(n)) {
+ iter->tnode = tn;
+ iter->index = cindex + 1;
+ } else {
+ /* push down one level */
+ iter->tnode = (struct tnode *) n;
+ iter->index = 0;
+ ++iter->depth;
}
+ return n;
}
- else n = NULL;
- }
- else seq_printf(seq, "------ trie is empty\n");
-
- read_unlock(&fib_lock);
-}
-
-static struct trie_stat *trie_stat_new(void)
-{
- struct trie_stat *s = kmalloc(sizeof(struct trie_stat), GFP_KERNEL);
- int i;
- if (s) {
- s->totdepth = 0;
- s->maxdepth = 0;
- s->tnodes = 0;
- s->leaves = 0;
- s->nullpointers = 0;
-
- for(i=0; i< MAX_CHILDS; i++)
- s->nodesizes[i] = 0;
+ ++cindex;
}
- return s;
-}
-
-static struct trie_stat *trie_collect_stats(struct trie *t)
-{
- struct node *n = t->trie;
- struct trie_stat *s = trie_stat_new();
- int cindex = 0;
- int indent = 1;
- int pend = 0;
- int depth = 0;
-
- read_lock(&fib_lock);
- if (s) {
- if (n) {
- if (IS_TNODE(n)) {
- struct tnode *tn = (struct tnode *)n;
- pend = tn->pos+tn->bits;
- indent += 3;
- s->nodesizes[tn->bits]++;
- depth++;
-
- while (tn && cindex < (1 << tn->bits)) {
- if (tn->child[cindex]) {
- /* Got a child */
-
- if (IS_LEAF(tn->child[cindex])) {
- cindex++;
-
- /* stats */
- if (depth > s->maxdepth)
- s->maxdepth = depth;
- s->totdepth += depth;
- s->leaves++;
- }
-
- else {
- /*
- * New tnode. Decend one level
- */
-
- s->tnodes++;
- s->nodesizes[tn->bits]++;
- depth++;
-
- n = tn->child[cindex];
- tn = (struct tnode *)n;
- pend = tn->pos+tn->bits;
-
- indent += 3;
- cindex = 0;
- }
- }
- else {
- cindex++;
- s->nullpointers++;
- }
-
- /*
- * Test if we are done
- */
-
- while (cindex >= (1 << tn->bits)) {
-
- /*
- * Move upwards and test for root
- * pop off all traversed nodes
- */
-
-
- if (NODE_PARENT(tn) == NULL) {
- tn = NULL;
- n = NULL;
- break;
- }
- else {
- cindex = tkey_extract_bits(tn->key, NODE_PARENT(tn)->pos, NODE_PARENT(tn)->bits);
- tn = NODE_PARENT(tn);
- cindex++;
- n = (struct node *)tn;
- pend = tn->pos+tn->bits;
- indent -= 3;
- depth--;
- }
- }
- }
- }
- else n = NULL;
- }
+ /* Current node exhausted, pop back up */
+ p = NODE_PARENT(tn);
+ if (p) {
+ cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1;
+ tn = p;
+ --iter->depth;
+ goto rescan;
}
- read_unlock(&fib_lock);
- return s;
-}
-
-#ifdef CONFIG_PROC_FS
-
-static struct fib_alias *fib_triestat_get_first(struct seq_file *seq)
-{
+ /* got root? */
return NULL;
}
-static struct fib_alias *fib_triestat_get_next(struct seq_file *seq)
+static struct node *fib_trie_get_first(struct fib_trie_iter *iter,
+ struct trie *t)
{
- return NULL;
-}
+ struct node *n = rcu_dereference(t->trie);
-static void *fib_triestat_seq_start(struct seq_file *seq, loff_t *pos)
-{
- void *v = NULL;
-
- if (ip_fib_main_table)
- v = *pos ? fib_triestat_get_next(seq) : SEQ_START_TOKEN;
- return v;
+ if (n && IS_TNODE(n)) {
+ iter->tnode = (struct tnode *) n;
+ iter->trie = t;
+ iter->index = 0;
+ iter->depth = 0;
+ return n;
+ }
+ return NULL;
}
-static void *fib_triestat_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+static void trie_collect_stats(struct trie *t, struct trie_stat *s)
{
- ++*pos;
- return v == SEQ_START_TOKEN ? fib_triestat_get_first(seq) : fib_triestat_get_next(seq);
-}
+ struct node *n;
+ struct fib_trie_iter iter;
-static void fib_triestat_seq_stop(struct seq_file *seq, void *v)
-{
+ memset(s, 0, sizeof(*s));
+ rcu_read_lock();
+ for (n = fib_trie_get_first(&iter, t); n;
+ n = fib_trie_get_next(&iter)) {
+ if (IS_LEAF(n)) {
+ s->leaves++;
+ s->totdepth += iter.depth;
+ if (iter.depth > s->maxdepth)
+ s->maxdepth = iter.depth;
+ } else {
+ const struct tnode *tn = (const struct tnode *) n;
+ int i;
+
+ s->tnodes++;
+ s->nodesizes[tn->bits]++;
+ for (i = 0; i < (1<<tn->bits); i++)
+ if (!tn->child[i])
+ s->nullpointers++;
+ }
+ }
+ rcu_read_unlock();
}
/*
* This outputs /proc/net/fib_triestats
- *
- * It always works in backward compatibility mode.
- * The format of the file is not supposed to be changed.
*/
-
-static void collect_and_show(struct trie *t, struct seq_file *seq)
+static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat)
{
- int bytes = 0; /* How many bytes are used, a ref is 4 bytes */
- int i, max, pointers;
- struct trie_stat *stat;
- int avdepth;
+ unsigned i, max, pointers, bytes, avdepth;
- stat = trie_collect_stats(t);
+ if (stat->leaves)
+ avdepth = stat->totdepth*100 / stat->leaves;
+ else
+ avdepth = 0;
- bytes=0;
- seq_printf(seq, "trie=%p\n", t);
+ seq_printf(seq, "\tAver depth: %d.%02d\n", avdepth / 100, avdepth % 100 );
+ seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth);
- if (stat) {
- if (stat->leaves)
- avdepth=stat->totdepth*100 / stat->leaves;
- else
- avdepth=0;
- seq_printf(seq, "Aver depth: %d.%02d\n", avdepth / 100, avdepth % 100 );
- seq_printf(seq, "Max depth: %4d\n", stat->maxdepth);
-
- seq_printf(seq, "Leaves: %d\n", stat->leaves);
- bytes += sizeof(struct leaf) * stat->leaves;
- seq_printf(seq, "Internal nodes: %d\n", stat->tnodes);
- bytes += sizeof(struct tnode) * stat->tnodes;
-
- max = MAX_CHILDS-1;
-
- while (max >= 0 && stat->nodesizes[max] == 0)
- max--;
- pointers = 0;
-
- for (i = 1; i <= max; i++)
- if (stat->nodesizes[i] != 0) {
- seq_printf(seq, " %d: %d", i, stat->nodesizes[i]);
- pointers += (1<<i) * stat->nodesizes[i];
- }
- seq_printf(seq, "\n");
- seq_printf(seq, "Pointers: %d\n", pointers);
- bytes += sizeof(struct node *) * pointers;
- seq_printf(seq, "Null ptrs: %d\n", stat->nullpointers);
- seq_printf(seq, "Total size: %d kB\n", bytes / 1024);
+ seq_printf(seq, "\tLeaves: %u\n", stat->leaves);
- kfree(stat);
- }
+ bytes = sizeof(struct leaf) * stat->leaves;
+ seq_printf(seq, "\tInternal nodes: %d\n\t", stat->tnodes);
+ bytes += sizeof(struct tnode) * stat->tnodes;
+
+ max = MAX_CHILDS-1;
+ while (max >= 0 && stat->nodesizes[max] == 0)
+ max--;
+
+ pointers = 0;
+ for (i = 1; i <= max; i++)
+ if (stat->nodesizes[i] != 0) {
+ seq_printf(seq, " %d: %d", i, stat->nodesizes[i]);
+ pointers += (1<<i) * stat->nodesizes[i];
+ }
+ seq_putc(seq, '\n');
+ seq_printf(seq, "\tPointers: %d\n", pointers);
+
+ bytes += sizeof(struct node *) * pointers;
+ seq_printf(seq, "Null ptrs: %d\n", stat->nullpointers);
+ seq_printf(seq, "Total size: %d kB\n", (bytes + 1023) / 1024);
#ifdef CONFIG_IP_FIB_TRIE_STATS
seq_printf(seq, "Counters:\n---------\n");
static int fib_triestat_seq_show(struct seq_file *seq, void *v)
{
- char bf[128];
+ struct trie_stat *stat;
- if (v == SEQ_START_TOKEN) {
- seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n",
- sizeof(struct leaf), sizeof(struct tnode));
- if (trie_local)
- collect_and_show(trie_local, seq);
+ stat = kmalloc(sizeof(*stat), GFP_KERNEL);
+ if (!stat)
+ return -ENOMEM;
- if (trie_main)
- collect_and_show(trie_main, seq);
+ seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n",
+ sizeof(struct leaf), sizeof(struct tnode));
+
+ if (trie_local) {
+ seq_printf(seq, "Local:\n");
+ trie_collect_stats(trie_local, stat);
+ trie_show_stats(seq, stat);
}
- else {
- snprintf(bf, sizeof(bf),
- "*\t%08X\t%08X", 200, 400);
-
- seq_printf(seq, "%-127s\n", bf);
+
+ if (trie_main) {
+ seq_printf(seq, "Main:\n");
+ trie_collect_stats(trie_main, stat);
+ trie_show_stats(seq, stat);
}
+ kfree(stat);
+
return 0;
}
-static struct seq_operations fib_triestat_seq_ops = {
- .start = fib_triestat_seq_start,
- .next = fib_triestat_seq_next,
- .stop = fib_triestat_seq_stop,
- .show = fib_triestat_seq_show,
-};
-
static int fib_triestat_seq_open(struct inode *inode, struct file *file)
{
- struct seq_file *seq;
- int rc = -ENOMEM;
-
- rc = seq_open(file, &fib_triestat_seq_ops);
- if (rc)
- goto out_kfree;
-
- seq = file->private_data;
-out:
- return rc;
-out_kfree:
- goto out;
+ return single_open(file, fib_triestat_seq_show, NULL);
}
-static struct file_operations fib_triestat_seq_fops = {
+static struct file_operations fib_triestat_fops = {
.owner = THIS_MODULE,
.open = fib_triestat_seq_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release_private,
+ .release = single_release,
};
-int __init fib_stat_proc_init(void)
+static struct node *fib_trie_get_idx(struct fib_trie_iter *iter,
+ loff_t pos)
{
- if (!proc_net_fops_create("fib_triestat", S_IRUGO, &fib_triestat_seq_fops))
- return -ENOMEM;
- return 0;
+ loff_t idx = 0;
+ struct node *n;
+
+ for (n = fib_trie_get_first(iter, trie_local);
+ n; ++idx, n = fib_trie_get_next(iter)) {
+ if (pos == idx)
+ return n;
+ }
+
+ for (n = fib_trie_get_first(iter, trie_main);
+ n; ++idx, n = fib_trie_get_next(iter)) {
+ if (pos == idx)
+ return n;
+ }
+ return NULL;
}
-void __init fib_stat_proc_exit(void)
+static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos)
{
- proc_net_remove("fib_triestat");
+ rcu_read_lock();
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
+ return fib_trie_get_idx(seq->private, *pos - 1);
}
-static struct fib_alias *fib_trie_get_first(struct seq_file *seq)
+static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
+ struct fib_trie_iter *iter = seq->private;
+ void *l = v;
+
+ ++*pos;
+ if (v == SEQ_START_TOKEN)
+ return fib_trie_get_idx(iter, 0);
+
+ v = fib_trie_get_next(iter);
+ BUG_ON(v == l);
+ if (v)
+ return v;
+
+ /* continue scan in next trie */
+ if (iter->trie == trie_local)
+ return fib_trie_get_first(iter, trie_main);
+
return NULL;
}
-static struct fib_alias *fib_trie_get_next(struct seq_file *seq)
+static void fib_trie_seq_stop(struct seq_file *seq, void *v)
{
- return NULL;
+ rcu_read_unlock();
}
-static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos)
+static void seq_indent(struct seq_file *seq, int n)
{
- void *v = NULL;
+ while (n-- > 0) seq_puts(seq, " ");
+}
+
+static inline const char *rtn_scope(enum rt_scope_t s)
+{
+ static char buf[32];
- if (ip_fib_main_table)
- v = *pos ? fib_trie_get_next(seq) : SEQ_START_TOKEN;
- return v;
+ switch(s) {
+ case RT_SCOPE_UNIVERSE: return "universe";
+ case RT_SCOPE_SITE: return "site";
+ case RT_SCOPE_LINK: return "link";
+ case RT_SCOPE_HOST: return "host";
+ case RT_SCOPE_NOWHERE: return "nowhere";
+ default:
+ snprintf(buf, sizeof(buf), "scope=%d", s);
+ return buf;
+ }
}
-static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+static const char *rtn_type_names[__RTN_MAX] = {
+ [RTN_UNSPEC] = "UNSPEC",
+ [RTN_UNICAST] = "UNICAST",
+ [RTN_LOCAL] = "LOCAL",
+ [RTN_BROADCAST] = "BROADCAST",
+ [RTN_ANYCAST] = "ANYCAST",
+ [RTN_MULTICAST] = "MULTICAST",
+ [RTN_BLACKHOLE] = "BLACKHOLE",
+ [RTN_UNREACHABLE] = "UNREACHABLE",
+ [RTN_PROHIBIT] = "PROHIBIT",
+ [RTN_THROW] = "THROW",
+ [RTN_NAT] = "NAT",
+ [RTN_XRESOLVE] = "XRESOLVE",
+};
+
+static inline const char *rtn_type(unsigned t)
{
- ++*pos;
- return v == SEQ_START_TOKEN ? fib_trie_get_first(seq) : fib_trie_get_next(seq);
+ static char buf[32];
+
+ if (t < __RTN_MAX && rtn_type_names[t])
+ return rtn_type_names[t];
+ snprintf(buf, sizeof(buf), "type %d", t);
+ return buf;
}
-static void fib_trie_seq_stop(struct seq_file *seq, void *v)
+/* Pretty print the trie */
+static int fib_trie_seq_show(struct seq_file *seq, void *v)
{
+ const struct fib_trie_iter *iter = seq->private;
+ struct node *n = v;
+
+ if (v == SEQ_START_TOKEN)
+ return 0;
+
+ if (IS_TNODE(n)) {
+ struct tnode *tn = (struct tnode *) n;
+ t_key prf = ntohl(MASK_PFX(tn->key, tn->pos));
+ if (!NODE_PARENT(n)) {
+ if (iter->trie == trie_local)
+ seq_puts(seq, "<local>:\n");
+ else
+ seq_puts(seq, "<main>:\n");
+ } else {
+ seq_indent(seq, iter->depth-1);
+ seq_printf(seq, " +-- %d.%d.%d.%d/%d\n",
+ NIPQUAD(prf), tn->pos);
+ }
+ } else {
+ struct leaf *l = (struct leaf *) n;
+ int i;
+ u32 val = ntohl(l->key);
+
+ seq_indent(seq, iter->depth);
+ seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val));
+ for (i = 32; i >= 0; i--) {
+ struct leaf_info *li = find_leaf_info(&l->list, i);
+ if (li) {
+ struct fib_alias *fa;
+ list_for_each_entry_rcu(fa, &li->falh, fa_list) {
+ seq_indent(seq, iter->depth+1);
+ seq_printf(seq, " /%d %s %s", i,
+ rtn_scope(fa->fa_scope),
+ rtn_type(fa->fa_type));
+ if (fa->fa_tos)
+ seq_printf(seq, "tos =%d\n",
+ fa->fa_tos);
+ seq_putc(seq, '\n');
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+static struct seq_operations fib_trie_seq_ops = {
+ .start = fib_trie_seq_start,
+ .next = fib_trie_seq_next,
+ .stop = fib_trie_seq_stop,
+ .show = fib_trie_seq_show,
+};
+
+static int fib_trie_seq_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (!s)
+ goto out;
+
+ rc = seq_open(file, &fib_trie_seq_ops);
+ if (rc)
+ goto out_kfree;
+
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}
+
+static struct file_operations fib_trie_fops = {
+ .owner = THIS_MODULE,
+ .open = fib_trie_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+static unsigned fib_flag_trans(int type, u32 mask, const struct fib_info *fi)
+{
+ static unsigned type2flags[RTN_MAX + 1] = {
+ [7] = RTF_REJECT, [8] = RTF_REJECT,
+ };
+ unsigned flags = type2flags[type];
+
+ if (fi && fi->fib_nh->nh_gw)
+ flags |= RTF_GATEWAY;
+ if (mask == 0xFFFFFFFF)
+ flags |= RTF_HOST;
+ flags |= RTF_UP;
+ return flags;
}
/*
- * This outputs /proc/net/fib_trie.
- *
- * It always works in backward compatibility mode.
- * The format of the file is not supposed to be changed.
+ * This outputs /proc/net/route.
+ * The format of the file is not supposed to be changed
+ * and needs to be same as fib_hash output to avoid breaking
+ * legacy utilities
*/
-
-static int fib_trie_seq_show(struct seq_file *seq, void *v)
+static int fib_route_seq_show(struct seq_file *seq, void *v)
{
+ struct leaf *l = v;
+ int i;
char bf[128];
if (v == SEQ_START_TOKEN) {
- if (trie_local)
- trie_dump_seq(seq, trie_local);
-
- if (trie_main)
- trie_dump_seq(seq, trie_main);
+ seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
+ "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
+ "\tWindow\tIRTT");
+ return 0;
}
- else {
- snprintf(bf, sizeof(bf),
- "*\t%08X\t%08X", 200, 400);
- seq_printf(seq, "%-127s\n", bf);
+ if (IS_TNODE(l))
+ return 0;
+
+ for (i=32; i>=0; i--) {
+ struct leaf_info *li = find_leaf_info(&l->list, i);
+ struct fib_alias *fa;
+ u32 mask, prefix;
+
+ if (!li)
+ continue;
+
+ mask = inet_make_mask(li->plen);
+ prefix = htonl(l->key);
+
+ list_for_each_entry_rcu(fa, &li->falh, fa_list) {
+ const struct fib_info *fi = rcu_dereference(fa->fa_info);
+ unsigned flags = fib_flag_trans(fa->fa_type, mask, fi);
+
+ if (fa->fa_type == RTN_BROADCAST
+ || fa->fa_type == RTN_MULTICAST)
+ continue;
+
+ if (fi)
+ snprintf(bf, sizeof(bf),
+ "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+ fi->fib_dev ? fi->fib_dev->name : "*",
+ prefix,
+ fi->fib_nh->nh_gw, flags, 0, 0,
+ fi->fib_priority,
+ mask,
+ (fi->fib_advmss ? fi->fib_advmss + 40 : 0),
+ fi->fib_window,
+ fi->fib_rtt >> 3);
+ else
+ snprintf(bf, sizeof(bf),
+ "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+ prefix, 0, flags, 0, 0, 0,
+ mask, 0, 0, 0);
+
+ seq_printf(seq, "%-127s\n", bf);
+ }
}
return 0;
}
-static struct seq_operations fib_trie_seq_ops = {
- .start = fib_trie_seq_start,
- .next = fib_trie_seq_next,
- .stop = fib_trie_seq_stop,
- .show = fib_trie_seq_show,
+static struct seq_operations fib_route_seq_ops = {
+ .start = fib_trie_seq_start,
+ .next = fib_trie_seq_next,
+ .stop = fib_trie_seq_stop,
+ .show = fib_route_seq_show,
};
-static int fib_trie_seq_open(struct inode *inode, struct file *file)
+static int fib_route_seq_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
int rc = -ENOMEM;
+ struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
- rc = seq_open(file, &fib_trie_seq_ops);
+ if (!s)
+ goto out;
+
+ rc = seq_open(file, &fib_route_seq_ops);
if (rc)
goto out_kfree;
- seq = file->private_data;
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
out:
return rc;
out_kfree:
+ kfree(s);
goto out;
}
-static struct file_operations fib_trie_seq_fops = {
- .owner = THIS_MODULE,
- .open = fib_trie_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release= seq_release_private,
+static struct file_operations fib_route_fops = {
+ .owner = THIS_MODULE,
+ .open = fib_route_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
};
int __init fib_proc_init(void)
{
- if (!proc_net_fops_create("fib_trie", S_IRUGO, &fib_trie_seq_fops))
- return -ENOMEM;
+ if (!proc_net_fops_create("fib_trie", S_IRUGO, &fib_trie_fops))
+ goto out1;
+
+ if (!proc_net_fops_create("fib_triestat", S_IRUGO, &fib_triestat_fops))
+ goto out2;
+
+ if (!proc_net_fops_create("route", S_IRUGO, &fib_route_fops))
+ goto out3;
+
return 0;
+
+out3:
+ proc_net_remove("fib_triestat");
+out2:
+ proc_net_remove("fib_trie");
+out1:
+ return -ENOMEM;
}
void __init fib_proc_exit(void)
{
proc_net_remove("fib_trie");
+ proc_net_remove("fib_triestat");
+ proc_net_remove("route");
}
#endif /* CONFIG_PROC_FS */
git.openpandora.org / pandora-kernel.git / blobdiff