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/*
* DECnet An implementation of the DECnet protocol suite for the LINUX
* operating system. DECnet is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* DECnet Routing Forwarding Information Base (Routing Tables)
*
* Author: Steve Whitehouse <SteveW@ACM.org>
* Mostly copied from the IPv4 routing code
*
*
* Changes:
*
*/
#include <linux/config.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <linux/route.h> /* RTF_xxx */
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/dn.h>
#include <net/dn_route.h>
#include <net/dn_fib.h>
#include <net/dn_neigh.h>
#include <net/dn_dev.h>
struct dn_zone
{
struct dn_zone *dz_next;
struct dn_fib_node **dz_hash;
int dz_nent;
int dz_divisor;
u32 dz_hashmask;
#define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
int dz_order;
u32 dz_mask;
#define DZ_MASK(dz) ((dz)->dz_mask)
};
struct dn_hash
{
struct dn_zone *dh_zones[17];
struct dn_zone *dh_zone_list;
};
#define dz_key_0(key) ((key).datum = 0)
#define dz_prefix(key,dz) ((key).datum)
#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
#define endfor_nexthops(fi) }
#define DN_MAX_DIVISOR 1024
#define DN_S_ZOMBIE 1
#define DN_S_ACCESSED 2
#define DN_FIB_SCAN(f, fp) \
for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
#define DN_FIB_SCAN_KEY(f, fp, key) \
for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
static rwlock_t dn_fib_tables_lock = RW_LOCK_UNLOCKED;
static struct dn_fib_table *dn_fib_tables[DN_NUM_TABLES + 1];
static kmem_cache_t *dn_hash_kmem;
static int dn_fib_hash_zombies;
static __inline__ dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
{
u32 h = ntohs(key.datum)>>(16 - dz->dz_order);
h ^= (h >> 10);
h ^= (h >> 6);
h ^= (h >> 3);
h &= DZ_HASHMASK(dz);
return *(dn_fib_idx_t *)&h;
}
static __inline__ dn_fib_key_t dz_key(u16 dst, struct dn_zone *dz)
{
dn_fib_key_t k;
k.datum = dst & DZ_MASK(dz);
return k;
}
static __inline__ struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
{
return &dz->dz_hash[dn_hash(key, dz).datum];
}
static __inline__ struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
{
return dz->dz_hash[dn_hash(key, dz).datum];
}
static __inline__ int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
{
return a.datum == b.datum;
}
static __inline__ int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
{
return a.datum <= b.datum;
}
static __inline__ void dn_rebuild_zone(struct dn_zone *dz,
struct dn_fib_node **old_ht,
int old_divisor)
{
int i;
struct dn_fib_node *f, **fp, *next;
for(i = 0; i < old_divisor; i++) {
for(f = old_ht[i]; f; f = f->fn_next) {
next = f->fn_next;
for(fp = dn_chain_p(f->fn_key, dz);
*fp && dn_key_leq((*fp)->fn_key, f->fn_key);
fp = &(*fp)->fn_next)
/* NOTHING */;
f->fn_next = *fp;
*fp = f;
}
}
}
static void dn_rehash_zone(struct dn_zone *dz)
{
struct dn_fib_node **ht, **old_ht;
int old_divisor, new_divisor;
u32 new_hashmask;
old_divisor = dz->dz_divisor;
switch(old_divisor) {
case 16:
new_divisor = 256;
new_hashmask = 0xFF;
break;
default:
printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor);
case 256:
new_divisor = 1024;
new_hashmask = 0x3FF;
break;
}
ht = kmalloc(new_divisor*sizeof(struct dn_fib_node*), GFP_KERNEL);
if (ht == NULL)
return;
memset(ht, 0, new_divisor*sizeof(struct dn_fib_node *));
write_lock_bh(&dn_fib_tables_lock);
old_ht = dz->dz_hash;
dz->dz_hash = ht;
dz->dz_hashmask = new_hashmask;
dz->dz_divisor = new_divisor;
dn_rebuild_zone(dz, old_ht, old_divisor);
write_unlock_bh(&dn_fib_tables_lock);
kfree(old_ht);
}
static void dn_free_node(struct dn_fib_node *f)
{
dn_fib_release_info(DN_FIB_INFO(f));
kmem_cache_free(dn_hash_kmem, f);
}
static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
{
int i;
struct dn_zone *dz = kmalloc(sizeof(struct dn_zone), GFP_KERNEL);
if (!dz)
return NULL;
memset(dz, 0, sizeof(struct dn_zone));
if (z) {
dz->dz_divisor = 16;
dz->dz_hashmask = 0x0F;
} else {
dz->dz_divisor = 1;
dz->dz_hashmask = 0;
}
dz->dz_hash = kmalloc(dz->dz_divisor*sizeof(struct dn_fib_node *), GFP_KERNEL);
if (!dz->dz_hash) {
kfree(dz);
return NULL;
}
memset(dz->dz_hash, 0, dz->dz_divisor*sizeof(struct dn_fib_node*));
dz->dz_order = z;
dz->dz_mask = dnet_make_mask(z);
for(i = z + 1; i <= 16; i++)
if (table->dh_zones[i])
break;
write_lock_bh(&dn_fib_tables_lock);
if (i>16) {
dz->dz_next = table->dh_zone_list;
table->dh_zone_list = dz;
} else {
dz->dz_next = table->dh_zones[i]->dz_next;
table->dh_zones[i]->dz_next = dz;
}
table->dh_zones[z] = dz;
write_unlock_bh(&dn_fib_tables_lock);
return dz;
}
static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
{
struct rtnexthop *nhp;
int nhlen;
if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
return 1;
if (rta->rta_oif || rta->rta_gw) {
if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
(!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
return 0;
return 1;
}
if (rta->rta_mp == NULL)
return 0;
nhp = RTA_DATA(rta->rta_mp);
nhlen = RTA_PAYLOAD(rta->rta_mp);
for_nexthops(fi) {
int attrlen = nhlen - sizeof(struct rtnexthop);
dn_address gw;
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
return -EINVAL;
if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
return 1;
if (attrlen) {
gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
if (gw && gw != nh->nh_gw)
return 1;
}
nhp = RTNH_NEXT(nhp);
} endfor_nexthops(fi);
return 0;
}
static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
u8 tb_id, u8 type, u8 scope, void *dst, int dst_len,
struct dn_fib_info *fi)
{
struct rtmsg *rtm;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*rtm));
rtm = NLMSG_DATA(nlh);
rtm->rtm_family = AF_DECnet;
rtm->rtm_dst_len = dst_len;
rtm->rtm_src_len = 0;
rtm->rtm_tos = 0;
rtm->rtm_table = tb_id;
rtm->rtm_flags = fi->fib_flags;
rtm->rtm_scope = scope;
rtm->rtm_type = type;
if (rtm->rtm_dst_len)
RTA_PUT(skb, RTA_DST, 2, dst);
rtm->rtm_protocol = fi->fib_protocol;
if (fi->fib_priority)
RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
if (fi->fib_nhs == 1) {
if (fi->fib_nh->nh_gw)
RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw);
if (fi->fib_nh->nh_oif)
RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
}
if (fi->fib_nhs > 1) {
struct rtnexthop *nhp;
struct rtattr *mp_head;
if (skb_tailroom(skb) <= RTA_SPACE(0))
goto rtattr_failure;
mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0));
for_nexthops(fi) {
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
goto rtattr_failure;
nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
nhp->rtnh_flags = nh->nh_flags & 0xFF;
nhp->rtnh_hops = nh->nh_weight - 1;
nhp->rtnh_ifindex = nh->nh_oif;
if (nh->nh_gw)
RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw);
nhp->rtnh_len = skb->tail - (unsigned char *)nhp;
} endfor_nexthops(fi);
mp_head->rta_type = RTA_MULTIPATH;
mp_head->rta_len = skb->tail - (u8*)mp_head;
}
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
rtattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, int tb_id,
struct nlmsghdr *nlh, struct netlink_skb_parms *req)
{
struct sk_buff *skb;
u32 pid = req ? req->pid : 0;
int size = NLMSG_SPACE(sizeof(struct rtmsg) + 256);
skb = alloc_skb(size, GFP_KERNEL);
if (!skb)
return;
if (dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id,
f->fn_type, f->fn_scope, &f->fn_key, z,
DN_FIB_INFO(f)) < 0) {
kfree_skb(skb);
return;
}
NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_ROUTE;
if (nlh->nlmsg_flags & NLM_F_ECHO)
atomic_inc(&skb->users);
netlink_broadcast(rtnl, skb, pid, RTMGRP_DECnet_ROUTE, GFP_KERNEL);
if (nlh->nlmsg_flags & NLM_F_ECHO)
netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
}
static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
struct netlink_callback *cb,
struct dn_fib_table *tb,
struct dn_zone *dz,
struct dn_fib_node *f)
{
int i, s_i;
s_i = cb->args[3];
for(i = 0; f; i++, f = f->fn_next) {
if (i < s_i)
continue;
if (f->fn_state & DN_S_ZOMBIE)
continue;
if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
RTM_NEWROUTE,
tb->n,
(f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
f->fn_scope, &f->fn_key, dz->dz_order,
f->fn_info) < 0) {
cb->args[3] = i;
return -1;
}
}
cb->args[3] = i;
return skb->len;
}
static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
struct netlink_callback *cb,
struct dn_fib_table *tb,
struct dn_zone *dz)
{
int h, s_h;
s_h = cb->args[2];
for(h = 0; h < dz->dz_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 (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
continue;
if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
cb->args[2] = h;
return -1;
}
}
cb->args[2] = h;
return skb->len;
}
static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
struct netlink_callback *cb)
{
int m, s_m;
struct dn_zone *dz;
struct dn_hash *table = (struct dn_hash *)tb->data;
s_m = cb->args[1];
read_lock(&dn_fib_tables_lock);
for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_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 (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
cb->args[1] = m;
read_unlock(&dn_fib_tables_lock);
return -1;
}
}
read_unlock(&dn_fib_tables_lock);
cb->args[1] = m;
return skb->len;
}
static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
{
struct dn_hash *table = (struct dn_hash *)tb->data;
struct dn_fib_node *new_f, *f, **fp, **del_fp;
struct dn_zone *dz;
struct dn_fib_info *fi;
int z = r->rtm_dst_len;
int type = r->rtm_type;
dn_fib_key_t key;
int err;
if (z > 16)
return -EINVAL;
dz = table->dh_zones[z];
if (!dz && !(dz = dn_new_zone(table, z)))
return -ENOBUFS;
dz_key_0(key);
if (rta->rta_dst) {
dn_address dst;
memcpy(&dst, rta->rta_dst, 2);
if (dst & ~DZ_MASK(dz))
return -EINVAL;
key = dz_key(dst, dz);
}
if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
return err;
if (dz->dz_nent > (dz->dz_divisor << 2) &&
dz->dz_divisor > DN_MAX_DIVISOR &&
(z==16 || (1<<z) > dz->dz_divisor))
dn_rehash_zone(dz);
fp = dn_chain_p(key, dz);
DN_FIB_SCAN(f, fp) {
if (dn_key_leq(key, f->fn_key))
break;
}
del_fp = NULL;
if (f && (f->fn_state & DN_S_ZOMBIE) &&
dn_key_eq(f->fn_key, key)) {
del_fp = fp;
fp = &f->fn_next;
f = *fp;
goto create;
}
DN_FIB_SCAN_KEY(f, fp, key) {
if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
break;
}
if (f && dn_key_eq(f->fn_key, key) &&
fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
struct dn_fib_node **ins_fp;
err = -EEXIST;
if (n->nlmsg_flags & NLM_F_EXCL)
goto out;
if (n->nlmsg_flags & NLM_F_REPLACE) {
del_fp = fp;
fp = &f->fn_next;
f = *fp;
goto replace;
}
ins_fp = fp;
err = -EEXIST;
DN_FIB_SCAN_KEY(f, fp, key) {
if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
break;
if (f->fn_type == type && f->fn_scope == r->rtm_scope
&& DN_FIB_INFO(f) == fi)
goto out;
}
if (!(n->nlmsg_flags & NLM_F_APPEND)) {
fp = ins_fp;
f = *fp;
}
}
create:
err = -ENOENT;
if (!(n->nlmsg_flags & NLM_F_CREATE))
goto out;
replace:
err = -ENOBUFS;
new_f = kmem_cache_alloc(dn_hash_kmem, SLAB_KERNEL);
if (new_f == NULL)
goto out;
memset(new_f, 0, sizeof(struct dn_fib_node));
new_f->fn_key = key;
new_f->fn_type = type;
new_f->fn_scope = r->rtm_scope;
DN_FIB_INFO(new_f) = fi;
new_f->fn_next = f;
write_lock_bh(&dn_fib_tables_lock);
*fp = new_f;
write_unlock_bh(&dn_fib_tables_lock);
dz->dz_nent++;
if (del_fp) {
f = *del_fp;
write_lock_bh(&dn_fib_tables_lock);
*del_fp = f->fn_next;
write_unlock_bh(&dn_fib_tables_lock);
if (!(f->fn_state & DN_S_ZOMBIE))
dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
if (f->fn_state & DN_S_ACCESSED)
dn_rt_cache_flush(-1);
dn_free_node(f);
dz->dz_nent--;
} else {
dn_rt_cache_flush(-1);
}
dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
return 0;
out:
dn_fib_release_info(fi);
return err;
}
static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
{
struct dn_hash *table = (struct dn_hash*)tb->data;
struct dn_fib_node **fp, **del_fp, *f;
int z = r->rtm_dst_len;
struct dn_zone *dz;
dn_fib_key_t key;
int matched;
if (z > 16)
return -EINVAL;
if ((dz = table->dh_zones[z]) == NULL)
return -ESRCH;
dz_key_0(key);
if (rta->rta_dst) {
dn_address dst;
memcpy(&dst, rta->rta_dst, 2);
if (dst & ~DZ_MASK(dz))
return -EINVAL;
key = dz_key(dst, dz);
}
fp = dn_chain_p(key, dz);
DN_FIB_SCAN(f, fp) {
if (dn_key_eq(f->fn_key, key))
break;
if (dn_key_leq(key, f->fn_key))
return -ESRCH;
}
matched = 0;
del_fp = NULL;
DN_FIB_SCAN_KEY(f, fp, key) {
struct dn_fib_info *fi = DN_FIB_INFO(f);
if (f->fn_state & DN_S_ZOMBIE)
return -ESRCH;
matched++;
if (del_fp == NULL &&
(!r->rtm_type || f->fn_type == r->rtm_type) &&
(r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
(!r->rtm_protocol ||
fi->fib_protocol == r->rtm_protocol) &&
dn_fib_nh_match(r, n, rta, fi) == 0)
del_fp = fp;
}
if (del_fp) {
f = *del_fp;
dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
if (matched != 1) {
write_lock_bh(&dn_fib_tables_lock);
*del_fp = f->fn_next;
write_unlock_bh(&dn_fib_tables_lock);
if (f->fn_state & DN_S_ACCESSED)
dn_rt_cache_flush(-1);
dn_free_node(f);
dz->dz_nent--;
} else {
f->fn_state |= DN_S_ZOMBIE;
if (f->fn_state & DN_S_ACCESSED) {
f->fn_state &= ~DN_S_ACCESSED;
dn_rt_cache_flush(-1);
}
if (++dn_fib_hash_zombies > 128)
dn_fib_flush();
}
return 0;
}
return -ESRCH;
}
static __inline__ int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
{
int found = 0;
struct dn_fib_node *f;
while((f = *fp) != NULL) {
struct dn_fib_info *fi = DN_FIB_INFO(f);
if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
write_lock_bh(&dn_fib_tables_lock);
*fp = f->fn_next;
write_unlock_bh(&dn_fib_tables_lock);
dn_free_node(f);
found++;
continue;
}
fp = &f->fn_next;
}
return found;
}
static int dn_fib_table_flush(struct dn_fib_table *tb)
{
struct dn_hash *table = (struct dn_hash *)tb->data;
struct dn_zone *dz;
int found = 0;
dn_fib_hash_zombies = 0;
for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
int i;
int tmp = 0;
for(i = dz->dz_divisor-1; i >= 0; i--)
tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
dz->dz_nent -= tmp;
found += tmp;
}
return found;
}
static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct dn_fib_key *
key, struct dn_fib_res *res)
{
int err;
struct dn_zone *dz;
struct dn_hash *t = (struct dn_hash *)tb->data;
read_lock(&dn_fib_tables_lock);
for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
struct dn_fib_node *f;
dn_fib_key_t k = dz_key(key->dst, dz);
for(f = dz_chain(k, dz); f; f = f->fn_next) {
if (!dn_key_leq(k, f->fn_key))
break;
else
continue;
f->fn_state |= DN_S_ACCESSED;
if (f->fn_state&DN_S_ZOMBIE)
continue;
if (f->fn_scope < key->scope)
continue;
err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), key, res);
if (err == 0) {
res->type = f->fn_type;
res->scope = f->fn_scope;
res->prefixlen = dz->dz_order;
goto out;
}
if (err < 0)
goto out;
}
}
err = 1;
out:
read_unlock(&dn_fib_tables_lock);
return err;
}
#ifdef CONFIG_PROC_FS
static unsigned dn_fib_flag_trans(int type, int dead, u16 mask, struct dn_fib_info *fi)
{
static unsigned type2flags[RTN_MAX+1] = {
0, 0, 0, 0, 0, 0, 0, RTF_REJECT, RTF_REJECT, 0, 0, 0
};
unsigned flags = type2flags[type];
if (fi && fi->fib_nh->nh_gw)
flags |= RTF_GATEWAY;
if (mask == 0xFFFF)
flags |= RTF_HOST;
if (dead)
flags |= RTF_UP;
return flags;
}
static void dn_fib_node_get_info(int type, int dead, struct dn_fib_info *fi, u16 prefix, u16 mask, char *buffer)
{
int len;
unsigned flags = dn_fib_flag_trans(type, dead, mask, fi);
if (fi) {
len = sprintf(buffer, "%s\t%04x\t%04x\t%04x\t%d\t%u\t%d\t%04x\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, 0, 0, 0);
} else {
len = sprintf(buffer, "*\t%04x\t%04x\t%04x\t%d\t%u\t%d\t%04x\t%d\t%u\t%u",
prefix, 0,
flags, 0, 0, 0,
mask, 0, 0, 0);
}
memset(buffer+len, ' ', 127-len);
buffer[127] = '\n';
}
static int dn_fib_table_get_info(struct dn_fib_table *tb, char *buffer, int first, int count)
{
struct dn_hash *table = (struct dn_hash *)tb->data;
struct dn_zone *dz;
int pos = 0;
int n = 0;
read_lock(&dn_fib_tables_lock);
for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
int i;
struct dn_fib_node *f;
int maxslot = dz->dz_divisor;
struct dn_fib_node **fp = dz->dz_hash;
if (dz->dz_nent == 0)
continue;
if (pos + dz->dz_nent < first) {
pos += dz->dz_nent;
continue;
}
for(i = 0; i < maxslot; i++, fp++) {
for(f = *fp; f ; f = f->fn_next) {
if (++pos <= first)
continue;
dn_fib_node_get_info(f->fn_type,
f->fn_state & DN_S_ZOMBIE,
DN_FIB_INFO(f),
dz_prefix(f->fn_key, dz),
DZ_MASK(dz), buffer);
buffer += 128;
if (++n >= count)
goto out;
}
}
}
out:
read_unlock(&dn_fib_tables_lock);
return n;
}
#endif /* CONFIG_PROC_FS */
struct dn_fib_table *dn_fib_get_table(int n, int create)
{
struct dn_fib_table *t;
if (n < DN_MIN_TABLE)
return NULL;
if (n > DN_NUM_TABLES)
return NULL;
if (dn_fib_tables[n])
return dn_fib_tables[n];
if (!create)
return NULL;
if (in_interrupt() && net_ratelimit()) {
printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table
from interrupt\n");
return NULL;
}
if ((t = kmalloc(sizeof(struct dn_fib_table), GFP_KERNEL)) == NULL)
return NULL;
memset(t, 0, sizeof(struct dn_fib_table));
t->n = n;
t->insert = dn_fib_table_insert;
t->delete = dn_fib_table_delete;
t->lookup = dn_fib_table_lookup;
t->flush = dn_fib_table_flush;
#ifdef CONFIG_PROC_FS
t->get_info = dn_fib_table_get_info;
#endif
t->dump = dn_fib_table_dump;
dn_fib_tables[n] = t;
return t;
}
static void dn_fib_del_tree(int n)
{
struct dn_fib_table *t;
write_lock(&dn_fib_tables_lock);
t = dn_fib_tables[n];
dn_fib_tables[n] = NULL;
write_unlock(&dn_fib_tables_lock);
if (t) {
kfree(t);
}
}
struct dn_fib_table *dn_fib_empty_table(void)
{
int id;
for(id = DN_MIN_TABLE; id <= DN_NUM_TABLES; id++)
if (dn_fib_tables[id] == NULL)
return dn_fib_get_table(id, 1);
return NULL;
}
void __init dn_fib_table_init(void)
{
dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
sizeof(struct dn_fib_info),
0, SLAB_HWCACHE_ALIGN,
NULL, NULL);
}
void __exit dn_fib_table_cleanup(void)
{
int i;
for (i = 0; i < DN_NUM_TABLES + 1; ++i)
dn_fib_del_tree(i);
return;
}
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