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https://github.com/edk2-porting/linux-next.git
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ba89966c19
This patch puts mostly read only data in the right section (read_mostly), to help sharing of these data between CPUS without memory ping pongs. On one of my production machine, tcp_statistics was sitting in a heavily modified cache line, so *every* SNMP update had to force a reload. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1088 lines
23 KiB
C
1088 lines
23 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* IPv4 FIB: lookup engine and maintenance routines.
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*
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* Version: $Id: fib_hash.c,v 1.13 2001/10/31 21:55:54 davem Exp $
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/errno.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/proc_fs.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/init.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/route.h>
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#include <net/tcp.h>
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#include <net/sock.h>
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#include <net/ip_fib.h>
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#include "fib_lookup.h"
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static kmem_cache_t *fn_hash_kmem __read_mostly;
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static kmem_cache_t *fn_alias_kmem __read_mostly;
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struct fib_node {
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struct hlist_node fn_hash;
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struct list_head fn_alias;
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u32 fn_key;
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};
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struct fn_zone {
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struct fn_zone *fz_next; /* Next not empty zone */
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struct hlist_head *fz_hash; /* Hash table pointer */
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int fz_nent; /* Number of entries */
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int fz_divisor; /* Hash divisor */
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u32 fz_hashmask; /* (fz_divisor - 1) */
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#define FZ_HASHMASK(fz) ((fz)->fz_hashmask)
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int fz_order; /* Zone order */
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u32 fz_mask;
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#define FZ_MASK(fz) ((fz)->fz_mask)
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};
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/* NOTE. On fast computers evaluation of fz_hashmask and fz_mask
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* can be cheaper than memory lookup, so that FZ_* macros are used.
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*/
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struct fn_hash {
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struct fn_zone *fn_zones[33];
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struct fn_zone *fn_zone_list;
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};
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static inline u32 fn_hash(u32 key, struct fn_zone *fz)
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{
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u32 h = ntohl(key)>>(32 - fz->fz_order);
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h ^= (h>>20);
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h ^= (h>>10);
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h ^= (h>>5);
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h &= FZ_HASHMASK(fz);
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return h;
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}
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static inline u32 fz_key(u32 dst, struct fn_zone *fz)
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{
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return dst & FZ_MASK(fz);
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}
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static DEFINE_RWLOCK(fib_hash_lock);
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static unsigned int fib_hash_genid;
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#define FZ_MAX_DIVISOR ((PAGE_SIZE<<MAX_ORDER) / sizeof(struct hlist_head))
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static struct hlist_head *fz_hash_alloc(int divisor)
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{
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unsigned long size = divisor * sizeof(struct hlist_head);
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if (size <= PAGE_SIZE) {
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return kmalloc(size, GFP_KERNEL);
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} else {
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return (struct hlist_head *)
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__get_free_pages(GFP_KERNEL, get_order(size));
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}
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}
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/* The fib hash lock must be held when this is called. */
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static inline void fn_rebuild_zone(struct fn_zone *fz,
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struct hlist_head *old_ht,
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int old_divisor)
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{
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int i;
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for (i = 0; i < old_divisor; i++) {
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struct hlist_node *node, *n;
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struct fib_node *f;
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hlist_for_each_entry_safe(f, node, n, &old_ht[i], fn_hash) {
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struct hlist_head *new_head;
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hlist_del(&f->fn_hash);
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new_head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
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hlist_add_head(&f->fn_hash, new_head);
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}
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}
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}
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static void fz_hash_free(struct hlist_head *hash, int divisor)
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{
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unsigned long size = divisor * sizeof(struct hlist_head);
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if (size <= PAGE_SIZE)
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kfree(hash);
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else
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free_pages((unsigned long)hash, get_order(size));
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}
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static void fn_rehash_zone(struct fn_zone *fz)
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{
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struct hlist_head *ht, *old_ht;
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int old_divisor, new_divisor;
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u32 new_hashmask;
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old_divisor = fz->fz_divisor;
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switch (old_divisor) {
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case 16:
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new_divisor = 256;
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break;
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case 256:
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new_divisor = 1024;
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break;
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default:
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if ((old_divisor << 1) > FZ_MAX_DIVISOR) {
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printk(KERN_CRIT "route.c: bad divisor %d!\n", old_divisor);
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return;
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}
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new_divisor = (old_divisor << 1);
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break;
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}
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new_hashmask = (new_divisor - 1);
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#if RT_CACHE_DEBUG >= 2
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printk("fn_rehash_zone: hash for zone %d grows from %d\n", fz->fz_order, old_divisor);
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#endif
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ht = fz_hash_alloc(new_divisor);
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if (ht) {
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memset(ht, 0, new_divisor * sizeof(struct hlist_head));
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write_lock_bh(&fib_hash_lock);
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old_ht = fz->fz_hash;
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fz->fz_hash = ht;
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fz->fz_hashmask = new_hashmask;
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fz->fz_divisor = new_divisor;
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fn_rebuild_zone(fz, old_ht, old_divisor);
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fib_hash_genid++;
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write_unlock_bh(&fib_hash_lock);
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fz_hash_free(old_ht, old_divisor);
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}
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}
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static inline void fn_free_node(struct fib_node * f)
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{
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kmem_cache_free(fn_hash_kmem, f);
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}
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static inline void fn_free_alias(struct fib_alias *fa)
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{
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fib_release_info(fa->fa_info);
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kmem_cache_free(fn_alias_kmem, fa);
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}
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static struct fn_zone *
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fn_new_zone(struct fn_hash *table, int z)
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{
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int i;
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struct fn_zone *fz = kmalloc(sizeof(struct fn_zone), GFP_KERNEL);
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if (!fz)
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return NULL;
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memset(fz, 0, sizeof(struct fn_zone));
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if (z) {
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fz->fz_divisor = 16;
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} else {
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fz->fz_divisor = 1;
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}
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fz->fz_hashmask = (fz->fz_divisor - 1);
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fz->fz_hash = fz_hash_alloc(fz->fz_divisor);
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if (!fz->fz_hash) {
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kfree(fz);
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return NULL;
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}
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memset(fz->fz_hash, 0, fz->fz_divisor * sizeof(struct hlist_head *));
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fz->fz_order = z;
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fz->fz_mask = inet_make_mask(z);
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/* Find the first not empty zone with more specific mask */
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for (i=z+1; i<=32; i++)
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if (table->fn_zones[i])
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break;
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write_lock_bh(&fib_hash_lock);
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if (i>32) {
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/* No more specific masks, we are the first. */
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fz->fz_next = table->fn_zone_list;
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table->fn_zone_list = fz;
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} else {
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fz->fz_next = table->fn_zones[i]->fz_next;
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table->fn_zones[i]->fz_next = fz;
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}
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table->fn_zones[z] = fz;
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fib_hash_genid++;
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write_unlock_bh(&fib_hash_lock);
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return fz;
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}
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static int
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fn_hash_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
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{
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int err;
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struct fn_zone *fz;
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struct fn_hash *t = (struct fn_hash*)tb->tb_data;
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read_lock(&fib_hash_lock);
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for (fz = t->fn_zone_list; fz; fz = fz->fz_next) {
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struct hlist_head *head;
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struct hlist_node *node;
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struct fib_node *f;
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u32 k = fz_key(flp->fl4_dst, fz);
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head = &fz->fz_hash[fn_hash(k, fz)];
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hlist_for_each_entry(f, node, head, fn_hash) {
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if (f->fn_key != k)
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continue;
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err = fib_semantic_match(&f->fn_alias,
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flp, res,
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f->fn_key, fz->fz_mask,
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fz->fz_order);
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if (err <= 0)
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goto out;
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}
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}
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err = 1;
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out:
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read_unlock(&fib_hash_lock);
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return err;
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}
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static int fn_hash_last_dflt=-1;
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static void
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fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
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{
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int order, last_idx;
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struct hlist_node *node;
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struct fib_node *f;
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struct fib_info *fi = NULL;
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struct fib_info *last_resort;
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struct fn_hash *t = (struct fn_hash*)tb->tb_data;
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struct fn_zone *fz = t->fn_zones[0];
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if (fz == NULL)
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return;
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last_idx = -1;
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last_resort = NULL;
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order = -1;
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read_lock(&fib_hash_lock);
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hlist_for_each_entry(f, node, &fz->fz_hash[0], fn_hash) {
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struct fib_alias *fa;
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list_for_each_entry(fa, &f->fn_alias, fa_list) {
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struct fib_info *next_fi = fa->fa_info;
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if (fa->fa_scope != res->scope ||
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fa->fa_type != RTN_UNICAST)
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continue;
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if (next_fi->fib_priority > res->fi->fib_priority)
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break;
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if (!next_fi->fib_nh[0].nh_gw ||
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next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
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continue;
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fa->fa_state |= FA_S_ACCESSED;
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if (fi == NULL) {
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if (next_fi != res->fi)
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break;
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} else if (!fib_detect_death(fi, order, &last_resort,
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&last_idx, &fn_hash_last_dflt)) {
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if (res->fi)
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fib_info_put(res->fi);
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res->fi = fi;
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atomic_inc(&fi->fib_clntref);
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fn_hash_last_dflt = order;
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goto out;
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}
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fi = next_fi;
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order++;
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}
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}
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if (order <= 0 || fi == NULL) {
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fn_hash_last_dflt = -1;
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goto out;
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}
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if (!fib_detect_death(fi, order, &last_resort, &last_idx, &fn_hash_last_dflt)) {
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if (res->fi)
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fib_info_put(res->fi);
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res->fi = fi;
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atomic_inc(&fi->fib_clntref);
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fn_hash_last_dflt = order;
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goto out;
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}
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if (last_idx >= 0) {
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if (res->fi)
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fib_info_put(res->fi);
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res->fi = last_resort;
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if (last_resort)
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atomic_inc(&last_resort->fib_clntref);
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}
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fn_hash_last_dflt = last_idx;
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out:
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read_unlock(&fib_hash_lock);
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}
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/* Insert node F to FZ. */
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static inline void fib_insert_node(struct fn_zone *fz, struct fib_node *f)
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{
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struct hlist_head *head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
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hlist_add_head(&f->fn_hash, head);
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}
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/* Return the node in FZ matching KEY. */
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static struct fib_node *fib_find_node(struct fn_zone *fz, u32 key)
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{
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struct hlist_head *head = &fz->fz_hash[fn_hash(key, fz)];
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struct hlist_node *node;
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struct fib_node *f;
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hlist_for_each_entry(f, node, head, fn_hash) {
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if (f->fn_key == key)
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return f;
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}
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return NULL;
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}
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static int
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fn_hash_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
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struct nlmsghdr *n, struct netlink_skb_parms *req)
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{
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struct fn_hash *table = (struct fn_hash *) tb->tb_data;
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struct fib_node *new_f, *f;
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struct fib_alias *fa, *new_fa;
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struct fn_zone *fz;
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struct fib_info *fi;
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int z = r->rtm_dst_len;
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int type = r->rtm_type;
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u8 tos = r->rtm_tos;
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u32 key;
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int err;
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if (z > 32)
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return -EINVAL;
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fz = table->fn_zones[z];
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if (!fz && !(fz = fn_new_zone(table, z)))
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return -ENOBUFS;
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key = 0;
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if (rta->rta_dst) {
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u32 dst;
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memcpy(&dst, rta->rta_dst, 4);
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if (dst & ~FZ_MASK(fz))
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return -EINVAL;
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key = fz_key(dst, fz);
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}
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if ((fi = fib_create_info(r, rta, n, &err)) == NULL)
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return err;
|
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if (fz->fz_nent > (fz->fz_divisor<<1) &&
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fz->fz_divisor < FZ_MAX_DIVISOR &&
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(z==32 || (1<<z) > fz->fz_divisor))
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fn_rehash_zone(fz);
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f = fib_find_node(fz, key);
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if (!f)
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fa = NULL;
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else
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fa = fib_find_alias(&f->fn_alias, tos, fi->fib_priority);
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/* Now fa, if non-NULL, points to the first fib alias
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* with the same keys [prefix,tos,priority], if such key already
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* exists or to the node before which we will insert new one.
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*
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* If fa is NULL, we will need to allocate a new one and
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* insert to the head of f.
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*
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* If f is NULL, no fib node matched the destination key
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* and we need to allocate a new one of those as well.
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*/
|
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if (fa && fa->fa_tos == tos &&
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fa->fa_info->fib_priority == fi->fib_priority) {
|
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struct fib_alias *fa_orig;
|
|
|
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err = -EEXIST;
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if (n->nlmsg_flags & NLM_F_EXCL)
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goto out;
|
|
|
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if (n->nlmsg_flags & NLM_F_REPLACE) {
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struct fib_info *fi_drop;
|
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u8 state;
|
|
|
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write_lock_bh(&fib_hash_lock);
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fi_drop = fa->fa_info;
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fa->fa_info = fi;
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fa->fa_type = type;
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fa->fa_scope = r->rtm_scope;
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state = fa->fa_state;
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fa->fa_state &= ~FA_S_ACCESSED;
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fib_hash_genid++;
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write_unlock_bh(&fib_hash_lock);
|
|
|
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fib_release_info(fi_drop);
|
|
if (state & FA_S_ACCESSED)
|
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rt_cache_flush(-1);
|
|
return 0;
|
|
}
|
|
|
|
/* Error if we find a perfect match which
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|
* uses the same scope, type, and nexthop
|
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* information.
|
|
*/
|
|
fa_orig = fa;
|
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fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
|
|
list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
|
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if (fa->fa_tos != tos)
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break;
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if (fa->fa_info->fib_priority != fi->fib_priority)
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break;
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|
if (fa->fa_type == type &&
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fa->fa_scope == r->rtm_scope &&
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fa->fa_info == fi)
|
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goto out;
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|
}
|
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if (!(n->nlmsg_flags & NLM_F_APPEND))
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fa = fa_orig;
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}
|
|
|
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err = -ENOENT;
|
|
if (!(n->nlmsg_flags&NLM_F_CREATE))
|
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goto out;
|
|
|
|
err = -ENOBUFS;
|
|
new_fa = kmem_cache_alloc(fn_alias_kmem, SLAB_KERNEL);
|
|
if (new_fa == NULL)
|
|
goto out;
|
|
|
|
new_f = NULL;
|
|
if (!f) {
|
|
new_f = kmem_cache_alloc(fn_hash_kmem, SLAB_KERNEL);
|
|
if (new_f == NULL)
|
|
goto out_free_new_fa;
|
|
|
|
INIT_HLIST_NODE(&new_f->fn_hash);
|
|
INIT_LIST_HEAD(&new_f->fn_alias);
|
|
new_f->fn_key = key;
|
|
f = new_f;
|
|
}
|
|
|
|
new_fa->fa_info = fi;
|
|
new_fa->fa_tos = tos;
|
|
new_fa->fa_type = type;
|
|
new_fa->fa_scope = r->rtm_scope;
|
|
new_fa->fa_state = 0;
|
|
|
|
/*
|
|
* Insert new entry to the list.
|
|
*/
|
|
|
|
write_lock_bh(&fib_hash_lock);
|
|
if (new_f)
|
|
fib_insert_node(fz, new_f);
|
|
list_add_tail(&new_fa->fa_list,
|
|
(fa ? &fa->fa_list : &f->fn_alias));
|
|
fib_hash_genid++;
|
|
write_unlock_bh(&fib_hash_lock);
|
|
|
|
if (new_f)
|
|
fz->fz_nent++;
|
|
rt_cache_flush(-1);
|
|
|
|
rtmsg_fib(RTM_NEWROUTE, key, new_fa, z, tb->tb_id, n, req);
|
|
return 0;
|
|
|
|
out_free_new_fa:
|
|
kmem_cache_free(fn_alias_kmem, new_fa);
|
|
out:
|
|
fib_release_info(fi);
|
|
return err;
|
|
}
|
|
|
|
|
|
static int
|
|
fn_hash_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
|
|
struct nlmsghdr *n, struct netlink_skb_parms *req)
|
|
{
|
|
struct fn_hash *table = (struct fn_hash*)tb->tb_data;
|
|
struct fib_node *f;
|
|
struct fib_alias *fa, *fa_to_delete;
|
|
int z = r->rtm_dst_len;
|
|
struct fn_zone *fz;
|
|
u32 key;
|
|
u8 tos = r->rtm_tos;
|
|
|
|
if (z > 32)
|
|
return -EINVAL;
|
|
if ((fz = table->fn_zones[z]) == NULL)
|
|
return -ESRCH;
|
|
|
|
key = 0;
|
|
if (rta->rta_dst) {
|
|
u32 dst;
|
|
memcpy(&dst, rta->rta_dst, 4);
|
|
if (dst & ~FZ_MASK(fz))
|
|
return -EINVAL;
|
|
key = fz_key(dst, fz);
|
|
}
|
|
|
|
f = fib_find_node(fz, key);
|
|
|
|
if (!f)
|
|
fa = NULL;
|
|
else
|
|
fa = fib_find_alias(&f->fn_alias, tos, 0);
|
|
if (!fa)
|
|
return -ESRCH;
|
|
|
|
fa_to_delete = NULL;
|
|
fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
|
|
list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
|
|
struct fib_info *fi = fa->fa_info;
|
|
|
|
if (fa->fa_tos != tos)
|
|
break;
|
|
|
|
if ((!r->rtm_type ||
|
|
fa->fa_type == r->rtm_type) &&
|
|
(r->rtm_scope == RT_SCOPE_NOWHERE ||
|
|
fa->fa_scope == r->rtm_scope) &&
|
|
(!r->rtm_protocol ||
|
|
fi->fib_protocol == r->rtm_protocol) &&
|
|
fib_nh_match(r, n, rta, fi) == 0) {
|
|
fa_to_delete = fa;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (fa_to_delete) {
|
|
int kill_fn;
|
|
|
|
fa = fa_to_delete;
|
|
rtmsg_fib(RTM_DELROUTE, key, fa, z, tb->tb_id, n, req);
|
|
|
|
kill_fn = 0;
|
|
write_lock_bh(&fib_hash_lock);
|
|
list_del(&fa->fa_list);
|
|
if (list_empty(&f->fn_alias)) {
|
|
hlist_del(&f->fn_hash);
|
|
kill_fn = 1;
|
|
}
|
|
fib_hash_genid++;
|
|
write_unlock_bh(&fib_hash_lock);
|
|
|
|
if (fa->fa_state & FA_S_ACCESSED)
|
|
rt_cache_flush(-1);
|
|
fn_free_alias(fa);
|
|
if (kill_fn) {
|
|
fn_free_node(f);
|
|
fz->fz_nent--;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
return -ESRCH;
|
|
}
|
|
|
|
static int fn_flush_list(struct fn_zone *fz, int idx)
|
|
{
|
|
struct hlist_head *head = &fz->fz_hash[idx];
|
|
struct hlist_node *node, *n;
|
|
struct fib_node *f;
|
|
int found = 0;
|
|
|
|
hlist_for_each_entry_safe(f, node, n, head, fn_hash) {
|
|
struct fib_alias *fa, *fa_node;
|
|
int kill_f;
|
|
|
|
kill_f = 0;
|
|
list_for_each_entry_safe(fa, fa_node, &f->fn_alias, fa_list) {
|
|
struct fib_info *fi = fa->fa_info;
|
|
|
|
if (fi && (fi->fib_flags&RTNH_F_DEAD)) {
|
|
write_lock_bh(&fib_hash_lock);
|
|
list_del(&fa->fa_list);
|
|
if (list_empty(&f->fn_alias)) {
|
|
hlist_del(&f->fn_hash);
|
|
kill_f = 1;
|
|
}
|
|
fib_hash_genid++;
|
|
write_unlock_bh(&fib_hash_lock);
|
|
|
|
fn_free_alias(fa);
|
|
found++;
|
|
}
|
|
}
|
|
if (kill_f) {
|
|
fn_free_node(f);
|
|
fz->fz_nent--;
|
|
}
|
|
}
|
|
return found;
|
|
}
|
|
|
|
static int fn_hash_flush(struct fib_table *tb)
|
|
{
|
|
struct fn_hash *table = (struct fn_hash *) tb->tb_data;
|
|
struct fn_zone *fz;
|
|
int found = 0;
|
|
|
|
for (fz = table->fn_zone_list; fz; fz = fz->fz_next) {
|
|
int i;
|
|
|
|
for (i = fz->fz_divisor - 1; i >= 0; i--)
|
|
found += fn_flush_list(fz, i);
|
|
}
|
|
return found;
|
|
}
|
|
|
|
|
|
static inline int
|
|
fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
|
|
struct fib_table *tb,
|
|
struct fn_zone *fz,
|
|
struct hlist_head *head)
|
|
{
|
|
struct hlist_node *node;
|
|
struct fib_node *f;
|
|
int i, s_i;
|
|
|
|
s_i = cb->args[3];
|
|
i = 0;
|
|
hlist_for_each_entry(f, node, head, fn_hash) {
|
|
struct fib_alias *fa;
|
|
|
|
list_for_each_entry(fa, &f->fn_alias, fa_list) {
|
|
if (i < s_i)
|
|
goto next;
|
|
|
|
if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWROUTE,
|
|
tb->tb_id,
|
|
fa->fa_type,
|
|
fa->fa_scope,
|
|
&f->fn_key,
|
|
fz->fz_order,
|
|
fa->fa_tos,
|
|
fa->fa_info,
|
|
NLM_F_MULTI) < 0) {
|
|
cb->args[3] = i;
|
|
return -1;
|
|
}
|
|
next:
|
|
i++;
|
|
}
|
|
}
|
|
cb->args[3] = i;
|
|
return skb->len;
|
|
}
|
|
|
|
static inline int
|
|
fn_hash_dump_zone(struct sk_buff *skb, struct netlink_callback *cb,
|
|
struct fib_table *tb,
|
|
struct fn_zone *fz)
|
|
{
|
|
int h, s_h;
|
|
|
|
s_h = cb->args[2];
|
|
for (h=0; h < fz->fz_divisor; h++) {
|
|
if (h < s_h) continue;
|
|
if (h > s_h)
|
|
memset(&cb->args[3], 0,
|
|
sizeof(cb->args) - 3*sizeof(cb->args[0]));
|
|
if (fz->fz_hash == NULL ||
|
|
hlist_empty(&fz->fz_hash[h]))
|
|
continue;
|
|
if (fn_hash_dump_bucket(skb, cb, tb, fz, &fz->fz_hash[h])<0) {
|
|
cb->args[2] = h;
|
|
return -1;
|
|
}
|
|
}
|
|
cb->args[2] = h;
|
|
return skb->len;
|
|
}
|
|
|
|
static int fn_hash_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int m, s_m;
|
|
struct fn_zone *fz;
|
|
struct fn_hash *table = (struct fn_hash*)tb->tb_data;
|
|
|
|
s_m = cb->args[1];
|
|
read_lock(&fib_hash_lock);
|
|
for (fz = table->fn_zone_list, m=0; fz; fz = fz->fz_next, m++) {
|
|
if (m < s_m) continue;
|
|
if (m > s_m)
|
|
memset(&cb->args[2], 0,
|
|
sizeof(cb->args) - 2*sizeof(cb->args[0]));
|
|
if (fn_hash_dump_zone(skb, cb, tb, fz) < 0) {
|
|
cb->args[1] = m;
|
|
read_unlock(&fib_hash_lock);
|
|
return -1;
|
|
}
|
|
}
|
|
read_unlock(&fib_hash_lock);
|
|
cb->args[1] = m;
|
|
return skb->len;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
struct fib_table * fib_hash_init(int id)
|
|
#else
|
|
struct fib_table * __init fib_hash_init(int id)
|
|
#endif
|
|
{
|
|
struct fib_table *tb;
|
|
|
|
if (fn_hash_kmem == NULL)
|
|
fn_hash_kmem = kmem_cache_create("ip_fib_hash",
|
|
sizeof(struct fib_node),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, NULL);
|
|
|
|
if (fn_alias_kmem == NULL)
|
|
fn_alias_kmem = kmem_cache_create("ip_fib_alias",
|
|
sizeof(struct fib_alias),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, NULL);
|
|
|
|
tb = kmalloc(sizeof(struct fib_table) + sizeof(struct fn_hash),
|
|
GFP_KERNEL);
|
|
if (tb == NULL)
|
|
return NULL;
|
|
|
|
tb->tb_id = id;
|
|
tb->tb_lookup = fn_hash_lookup;
|
|
tb->tb_insert = fn_hash_insert;
|
|
tb->tb_delete = fn_hash_delete;
|
|
tb->tb_flush = fn_hash_flush;
|
|
tb->tb_select_default = fn_hash_select_default;
|
|
tb->tb_dump = fn_hash_dump;
|
|
memset(tb->tb_data, 0, sizeof(struct fn_hash));
|
|
return tb;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
struct fib_iter_state {
|
|
struct fn_zone *zone;
|
|
int bucket;
|
|
struct hlist_head *hash_head;
|
|
struct fib_node *fn;
|
|
struct fib_alias *fa;
|
|
loff_t pos;
|
|
unsigned int genid;
|
|
int valid;
|
|
};
|
|
|
|
static struct fib_alias *fib_get_first(struct seq_file *seq)
|
|
{
|
|
struct fib_iter_state *iter = seq->private;
|
|
struct fn_hash *table = (struct fn_hash *) ip_fib_main_table->tb_data;
|
|
|
|
iter->bucket = 0;
|
|
iter->hash_head = NULL;
|
|
iter->fn = NULL;
|
|
iter->fa = NULL;
|
|
iter->pos = 0;
|
|
iter->genid = fib_hash_genid;
|
|
iter->valid = 1;
|
|
|
|
for (iter->zone = table->fn_zone_list; iter->zone;
|
|
iter->zone = iter->zone->fz_next) {
|
|
int maxslot;
|
|
|
|
if (!iter->zone->fz_nent)
|
|
continue;
|
|
|
|
iter->hash_head = iter->zone->fz_hash;
|
|
maxslot = iter->zone->fz_divisor;
|
|
|
|
for (iter->bucket = 0; iter->bucket < maxslot;
|
|
++iter->bucket, ++iter->hash_head) {
|
|
struct hlist_node *node;
|
|
struct fib_node *fn;
|
|
|
|
hlist_for_each_entry(fn,node,iter->hash_head,fn_hash) {
|
|
struct fib_alias *fa;
|
|
|
|
list_for_each_entry(fa,&fn->fn_alias,fa_list) {
|
|
iter->fn = fn;
|
|
iter->fa = fa;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
return iter->fa;
|
|
}
|
|
|
|
static struct fib_alias *fib_get_next(struct seq_file *seq)
|
|
{
|
|
struct fib_iter_state *iter = seq->private;
|
|
struct fib_node *fn;
|
|
struct fib_alias *fa;
|
|
|
|
/* Advance FA, if any. */
|
|
fn = iter->fn;
|
|
fa = iter->fa;
|
|
if (fa) {
|
|
BUG_ON(!fn);
|
|
list_for_each_entry_continue(fa, &fn->fn_alias, fa_list) {
|
|
iter->fa = fa;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
fa = iter->fa = NULL;
|
|
|
|
/* Advance FN. */
|
|
if (fn) {
|
|
struct hlist_node *node = &fn->fn_hash;
|
|
hlist_for_each_entry_continue(fn, node, fn_hash) {
|
|
iter->fn = fn;
|
|
|
|
list_for_each_entry(fa, &fn->fn_alias, fa_list) {
|
|
iter->fa = fa;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn = iter->fn = NULL;
|
|
|
|
/* Advance hash chain. */
|
|
if (!iter->zone)
|
|
goto out;
|
|
|
|
for (;;) {
|
|
struct hlist_node *node;
|
|
int maxslot;
|
|
|
|
maxslot = iter->zone->fz_divisor;
|
|
|
|
while (++iter->bucket < maxslot) {
|
|
iter->hash_head++;
|
|
|
|
hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
|
|
list_for_each_entry(fa, &fn->fn_alias, fa_list) {
|
|
iter->fn = fn;
|
|
iter->fa = fa;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
iter->zone = iter->zone->fz_next;
|
|
|
|
if (!iter->zone)
|
|
goto out;
|
|
|
|
iter->bucket = 0;
|
|
iter->hash_head = iter->zone->fz_hash;
|
|
|
|
hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
|
|
list_for_each_entry(fa, &fn->fn_alias, fa_list) {
|
|
iter->fn = fn;
|
|
iter->fa = fa;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
iter->pos++;
|
|
return fa;
|
|
}
|
|
|
|
static struct fib_alias *fib_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct fib_iter_state *iter = seq->private;
|
|
struct fib_alias *fa;
|
|
|
|
if (iter->valid && pos >= iter->pos && iter->genid == fib_hash_genid) {
|
|
fa = iter->fa;
|
|
pos -= iter->pos;
|
|
} else
|
|
fa = fib_get_first(seq);
|
|
|
|
if (fa)
|
|
while (pos && (fa = fib_get_next(seq)))
|
|
--pos;
|
|
return pos ? NULL : fa;
|
|
}
|
|
|
|
static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
void *v = NULL;
|
|
|
|
read_lock(&fib_hash_lock);
|
|
if (ip_fib_main_table)
|
|
v = *pos ? fib_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
return v;
|
|
}
|
|
|
|
static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return v == SEQ_START_TOKEN ? fib_get_first(seq) : fib_get_next(seq);
|
|
}
|
|
|
|
static void fib_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
read_unlock(&fib_hash_lock);
|
|
}
|
|
|
|
static unsigned fib_flag_trans(int type, u32 mask, 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/route.
|
|
*
|
|
* It always works in backward compatibility mode.
|
|
* The format of the file is not supposed to be changed.
|
|
*/
|
|
static int fib_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct fib_iter_state *iter;
|
|
char bf[128];
|
|
u32 prefix, mask;
|
|
unsigned flags;
|
|
struct fib_node *f;
|
|
struct fib_alias *fa;
|
|
struct fib_info *fi;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
|
|
"\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
|
|
"\tWindow\tIRTT");
|
|
goto out;
|
|
}
|
|
|
|
iter = seq->private;
|
|
f = iter->fn;
|
|
fa = iter->fa;
|
|
fi = fa->fa_info;
|
|
prefix = f->fn_key;
|
|
mask = FZ_MASK(iter->zone);
|
|
flags = fib_flag_trans(fa->fa_type, mask, fi);
|
|
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);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations fib_seq_ops = {
|
|
.start = fib_seq_start,
|
|
.next = fib_seq_next,
|
|
.stop = fib_seq_stop,
|
|
.show = fib_seq_show,
|
|
};
|
|
|
|
static int fib_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq;
|
|
int rc = -ENOMEM;
|
|
struct fib_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
|
goto out;
|
|
|
|
rc = seq_open(file, &fib_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_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = fib_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
int __init fib_proc_init(void)
|
|
{
|
|
if (!proc_net_fops_create("route", S_IRUGO, &fib_seq_fops))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void __init fib_proc_exit(void)
|
|
{
|
|
proc_net_remove("route");
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|