kernel-ark/net/decnet/dn_table.c
Steven Whitehouse c4ea94ab37 [DECnet]: Endian annotation and fixes for DECnet.
The typedef for dn_address has been removed in favour of using __le16
or __u16 directly as appropriate. All the DECnet header files are
updated accordingly.

The byte ordering of dn_eth2dn() and dn_dn2eth() are both changed
since just about all their callers wanted network order rather than
host order, so the conversion is now done in the functions themselves.

Several missed endianess conversions have been picked up during the
conversion process. The nh_gw field in struct dn_fib_info has been
changed from a 32 bit field to 16 bits as it ought to be.

One or two cases of using htons rather than dn_htons in the routing
code have been found and fixed.

There are still a few warnings to fix, but this patch deals with the
important cases.

Signed-off-by: Steven Whitehouse <steve@chygwyn.com>
Signed-off-by: Patrick Caulfield <patrick@tykepenguin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 22:42:39 -08:00

824 lines
19 KiB
C

/*
* 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/flow.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;
__le16 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)
#define RT_TABLE_MIN 1
static DEFINE_RWLOCK(dn_fib_tables_lock);
struct dn_fib_table *dn_fib_tables[RT_TABLE_MAX + 1];
static kmem_cache_t *dn_hash_kmem __read_mostly;
static int dn_fib_hash_zombies;
static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
{
u16 h = dn_ntohs(key.datum)>>(16 - dz->dz_order);
h ^= (h >> 10);
h ^= (h >> 6);
h &= DZ_HASHMASK(dz);
return *(dn_fib_idx_t *)&h;
}
static inline dn_fib_key_t dz_key(__le16 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);
__le16 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, unsigned int flags)
{
struct rtmsg *rtm;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags);
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 (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
goto rtattr_failure;
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) < 0) {
kfree_skb(skb);
return;
}
NETLINK_CB(skb).dst_group = RTNLGRP_DECnet_ROUTE;
if (nlh->nlmsg_flags & NLM_F_ECHO)
atomic_inc(&skb->users);
netlink_broadcast(rtnl, skb, pid, RTNLGRP_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, NLM_F_MULTI) < 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) {
__le16 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) {
__le16 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 flowi *flp, 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(flp->fld_dst, dz);
for(f = dz_chain(k, dz); f; f = f->fn_next) {
if (!dn_key_eq(k, f->fn_key)) {
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 < flp->fld_scope)
continue;
err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, 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;
}
struct dn_fib_table *dn_fib_get_table(int n, int create)
{
struct dn_fib_table *t;
if (n < RT_TABLE_MIN)
return NULL;
if (n > RT_TABLE_MAX)
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) + sizeof(struct dn_hash), 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;
t->dump = dn_fib_table_dump;
memset(t->data, 0, sizeof(struct dn_hash));
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);
kfree(t);
}
struct dn_fib_table *dn_fib_empty_table(void)
{
int id;
for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; 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 = RT_TABLE_MIN; i <= RT_TABLE_MAX; ++i)
dn_fib_del_tree(i);
return;
}