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linux-hardened/net/ipv4/fib_hash.c
Jamal Hadi Salim b6544c0b4c [NETLINK]: Correctly set NLM_F_MULTI without checking the pid 
This patch rectifies some rtnetlink message builders that derive the
flags from the pid. It is now explicit like the other cases
which get it right. Also fixes half a dozen dumpers which did not
set NLM_F_MULTI at all.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-18 22:54:12 -07:00

1087 lines
23 KiB
C
Raw Blame History

/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* IPv4 FIB: lookup engine and maintenance routines.
*
* Version: $Id: fib_hash.c,v 1.13 2001/10/31 21:55:54 davem Exp $
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/init.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/sock.h>
#include <net/ip_fib.h>
#include "fib_lookup.h"
static kmem_cache_t *fn_hash_kmem;
static kmem_cache_t *fn_alias_kmem;
struct fib_node {
struct hlist_node fn_hash;
struct list_head fn_alias;
u32 fn_key;
};
struct fn_zone {
struct fn_zone *fz_next; /* Next not empty zone */
struct hlist_head *fz_hash; /* Hash table pointer */
int fz_nent; /* Number of entries */
int fz_divisor; /* Hash divisor */
u32 fz_hashmask; /* (fz_divisor - 1) */
#define FZ_HASHMASK(fz) ((fz)->fz_hashmask)
int fz_order; /* Zone order */
u32 fz_mask;
#define FZ_MASK(fz) ((fz)->fz_mask)
};
/* NOTE. On fast computers evaluation of fz_hashmask and fz_mask
* can be cheaper than memory lookup, so that FZ_* macros are used.
*/
struct fn_hash {
struct fn_zone *fn_zones[33];
struct fn_zone *fn_zone_list;
};
static inline u32 fn_hash(u32 key, struct fn_zone *fz)
{
u32 h = ntohl(key)>>(32 - fz->fz_order);
h ^= (h>>20);
h ^= (h>>10);
h ^= (h>>5);
h &= FZ_HASHMASK(fz);
return h;
}
static inline u32 fz_key(u32 dst, struct fn_zone *fz)
{
return dst & FZ_MASK(fz);
}
static DEFINE_RWLOCK(fib_hash_lock);
static unsigned int fib_hash_genid;
#define FZ_MAX_DIVISOR ((PAGE_SIZE<<MAX_ORDER) / sizeof(struct hlist_head))
static struct hlist_head *fz_hash_alloc(int divisor)
{
unsigned long size = divisor * sizeof(struct hlist_head);
if (size <= PAGE_SIZE) {
return kmalloc(size, GFP_KERNEL);
} else {
return (struct hlist_head *)
__get_free_pages(GFP_KERNEL, get_order(size));
}
}
/* The fib hash lock must be held when this is called. */
static inline void fn_rebuild_zone(struct fn_zone *fz,
struct hlist_head *old_ht,
int old_divisor)
{
int i;
for (i = 0; i < old_divisor; i++) {
struct hlist_node *node, *n;
struct fib_node *f;
hlist_for_each_entry_safe(f, node, n, &old_ht[i], fn_hash) {
struct hlist_head *new_head;
hlist_del(&f->fn_hash);
new_head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
hlist_add_head(&f->fn_hash, new_head);
}
}
}
static void fz_hash_free(struct hlist_head *hash, int divisor)
{
unsigned long size = divisor * sizeof(struct hlist_head);
if (size <= PAGE_SIZE)
kfree(hash);
else
free_pages((unsigned long)hash, get_order(size));
}
static void fn_rehash_zone(struct fn_zone *fz)
{
struct hlist_head *ht, *old_ht;
int old_divisor, new_divisor;
u32 new_hashmask;
old_divisor = fz->fz_divisor;
switch (old_divisor) {
case 16:
new_divisor = 256;
break;
case 256:
new_divisor = 1024;
break;
default:
if ((old_divisor << 1) > FZ_MAX_DIVISOR) {
printk(KERN_CRIT "route.c: bad divisor %d!\n", old_divisor);
return;
}
new_divisor = (old_divisor << 1);
break;
}
new_hashmask = (new_divisor - 1);
#if RT_CACHE_DEBUG >= 2
printk("fn_rehash_zone: hash for zone %d grows from %d\n", fz->fz_order, old_divisor);
#endif
ht = fz_hash_alloc(new_divisor);
if (ht) {
memset(ht, 0, new_divisor * sizeof(struct hlist_head));
write_lock_bh(&fib_hash_lock);
old_ht = fz->fz_hash;
fz->fz_hash = ht;
fz->fz_hashmask = new_hashmask;
fz->fz_divisor = new_divisor;
fn_rebuild_zone(fz, old_ht, old_divisor);
fib_hash_genid++;
write_unlock_bh(&fib_hash_lock);
fz_hash_free(old_ht, old_divisor);
}
}
static inline void fn_free_node(struct fib_node * f)
{
kmem_cache_free(fn_hash_kmem, f);
}
static inline void fn_free_alias(struct fib_alias *fa)
{
fib_release_info(fa->fa_info);
kmem_cache_free(fn_alias_kmem, fa);
}
static struct fn_zone *
fn_new_zone(struct fn_hash *table, int z)
{
int i;
struct fn_zone *fz = kmalloc(sizeof(struct fn_zone), GFP_KERNEL);
if (!fz)
return NULL;
memset(fz, 0, sizeof(struct fn_zone));
if (z) {
fz->fz_divisor = 16;
} else {
fz->fz_divisor = 1;
}
fz->fz_hashmask = (fz->fz_divisor - 1);
fz->fz_hash = fz_hash_alloc(fz->fz_divisor);
if (!fz->fz_hash) {
kfree(fz);
return NULL;
}
memset(fz->fz_hash, 0, fz->fz_divisor * sizeof(struct hlist_head *));
fz->fz_order = z;
fz->fz_mask = inet_make_mask(z);
/* Find the first not empty zone with more specific mask */
for (i=z+1; i<=32; i++)
if (table->fn_zones[i])
break;
write_lock_bh(&fib_hash_lock);
if (i>32) {
/* No more specific masks, we are the first. */
fz->fz_next = table->fn_zone_list;
table->fn_zone_list = fz;
} else {
fz->fz_next = table->fn_zones[i]->fz_next;
table->fn_zones[i]->fz_next = fz;
}
table->fn_zones[z] = fz;
fib_hash_genid++;
write_unlock_bh(&fib_hash_lock);
return fz;
}
static int
fn_hash_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
{
int err;
struct fn_zone *fz;
struct fn_hash *t = (struct fn_hash*)tb->tb_data;
read_lock(&fib_hash_lock);
for (fz = t->fn_zone_list; fz; fz = fz->fz_next) {
struct hlist_head *head;
struct hlist_node *node;
struct fib_node *f;
u32 k = fz_key(flp->fl4_dst, fz);
head = &fz->fz_hash[fn_hash(k, fz)];
hlist_for_each_entry(f, node, head, fn_hash) {
if (f->fn_key != k)
continue;
err = fib_semantic_match(&f->fn_alias,
flp, res,
f->fn_key, fz->fz_mask,
fz->fz_order);
if (err <= 0)
goto out;
}
}
err = 1;
out:
read_unlock(&fib_hash_lock);
return err;
}
static int fn_hash_last_dflt=-1;
static void
fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
{
int order, last_idx;
struct hlist_node *node;
struct fib_node *f;
struct fib_info *fi = NULL;
struct fib_info *last_resort;
struct fn_hash *t = (struct fn_hash*)tb->tb_data;
struct fn_zone *fz = t->fn_zones[0];
if (fz == NULL)
return;
last_idx = -1;
last_resort = NULL;
order = -1;
read_lock(&fib_hash_lock);
hlist_for_each_entry(f, node, &fz->fz_hash[0], fn_hash) {
struct fib_alias *fa;
list_for_each_entry(fa, &f->fn_alias, 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;
} else if (!fib_detect_death(fi, order, &last_resort,
&last_idx, &fn_hash_last_dflt)) {
if (res->fi)
fib_info_put(res->fi);
res->fi = fi;
atomic_inc(&fi->fib_clntref);
fn_hash_last_dflt = order;
goto out;
}
fi = next_fi;
order++;
}
}
if (order <= 0 || fi == NULL) {
fn_hash_last_dflt = -1;
goto out;
}
if (!fib_detect_death(fi, order, &last_resort, &last_idx, &fn_hash_last_dflt)) {
if (res->fi)
fib_info_put(res->fi);
res->fi = fi;
atomic_inc(&fi->fib_clntref);
fn_hash_last_dflt = order;
goto out;
}
if (last_idx >= 0) {
if (res->fi)
fib_info_put(res->fi);
res->fi = last_resort;
if (last_resort)
atomic_inc(&last_resort->fib_clntref);
}
fn_hash_last_dflt = last_idx;
out:
read_unlock(&fib_hash_lock);
}
/* Insert node F to FZ. */
static inline void fib_insert_node(struct fn_zone *fz, struct fib_node *f)
{
struct hlist_head *head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
hlist_add_head(&f->fn_hash, head);
}
/* Return the node in FZ matching KEY. */
static struct fib_node *fib_find_node(struct fn_zone *fz, u32 key)
{
struct hlist_head *head = &fz->fz_hash[fn_hash(key, fz)];
struct hlist_node *node;
struct fib_node *f;
hlist_for_each_entry(f, node, head, fn_hash) {
if (f->fn_key == key)
return f;
}
return NULL;
}
static int
fn_hash_insert(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 *new_f, *f;
struct fib_alias *fa, *new_fa;
struct fn_zone *fz;
struct fib_info *fi;
int z = r->rtm_dst_len;
int type = r->rtm_type;
u8 tos = r->rtm_tos;
u32 key;
int err;
if (z > 32)
return -EINVAL;
fz = table->fn_zones[z];
if (!fz && !(fz = fn_new_zone(table, z)))
return -ENOBUFS;
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);
}
if ((fi = fib_create_info(r, rta, n, &err)) == NULL)
return err;
if (fz->fz_nent > (fz->fz_divisor<<1) &&
fz->fz_divisor < FZ_MAX_DIVISOR &&
(z==32 || (1<<z) > fz->fz_divisor))
fn_rehash_zone(fz);
f = fib_find_node(fz, key);
if (!f)
fa = NULL;
else
fa = fib_find_alias(&f->fn_alias, tos, fi->fib_priority);
/* Now fa, if non-NULL, points to the first fib alias
* with the same keys [prefix,tos,priority], if such key already
* exists or to the node before which we will insert new one.
*
* If fa is NULL, we will need to allocate a new one and
* insert to the head of f.
*
* If f is NULL, no fib node matched the destination key
* and we need to allocate a new one of those as well.
*/
if (fa && fa->fa_tos == tos &&
fa->fa_info->fib_priority == fi->fib_priority) {
struct fib_alias *fa_orig;
err = -EEXIST;
if (n->nlmsg_flags & NLM_F_EXCL)
goto out;
if (n->nlmsg_flags & NLM_F_REPLACE) {
struct fib_info *fi_drop;
u8 state;
write_lock_bh(&fib_hash_lock);
fi_drop = fa->fa_info;
fa->fa_info = fi;
fa->fa_type = type;
fa->fa_scope = r->rtm_scope;
state = fa->fa_state;
fa->fa_state &= ~FA_S_ACCESSED;
fib_hash_genid++;
write_unlock_bh(&fib_hash_lock);
fib_release_info(fi_drop);
if (state & FA_S_ACCESSED)
rt_cache_flush(-1);
return 0;
}
/* Error if we find a perfect match which
* uses the same scope, type, and nexthop
* information.
*/
fa_orig = fa;
fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
if (fa->fa_tos != tos)
break;
if (fa->fa_info->fib_priority != fi->fib_priority)
break;
if (fa->fa_type == type &&
fa->fa_scope == r->rtm_scope &&
fa->fa_info == fi)
goto out;
}
if (!(n->nlmsg_flags & NLM_F_APPEND))
fa = fa_orig;
}
err = -ENOENT;
if (!(n->nlmsg_flags&NLM_F_CREATE))
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 */
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