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netns: ipmr: dynamically allocate mfc_cache_array 

Preliminary work to make IPv4 multicast routing netns-aware.

Dynamically allocate IPv4 multicast forwarding cache, mfc_cache_array,
and move it to struct netns_ipv4.

At the moment, mfc_cache_array is only referenced in init_net.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin Thery 2009-01-22 04:56:18 +00:00 committed by David S. Miller
parent 5c0a66f5f3
commit 2bb8b26c3e
2 changed files with 29 additions and 13 deletions
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1
include/net/netns/ipv4.h
View File

@ -57,6 +57,7 @@ struct netns_ipv4 {
#ifdef CONFIG_IP_MROUTE
struct sock *mroute_sk;
struct mfc_cache **mfc_cache_array;
struct vif_device *vif_table;
int maxvif;
#endif

41
net/ipv4/ipmr.c
View File

@ -82,8 +82,6 @@ static DEFINE_RWLOCK(mrt_lock);
static int mroute_do_assert; /* Set in PIM assert */
static int mroute_do_pim;
static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */
static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */
static atomic_t cache_resolve_queue_len; /* Size of unresolved */
@ -524,7 +522,7 @@ static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp)
int line = MFC_HASH(mcastgrp, origin);
struct mfc_cache *c;
for (c=mfc_cache_array[line]; c; c = c->next) {
for (c = init_net.ipv4.mfc_cache_array[line]; c; c = c->next) {
if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp)
break;
}
@ -764,7 +762,8 @@ static int ipmr_mfc_delete(struct mfcctl *mfc)
line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) {
for (cp = &init_net.ipv4.mfc_cache_array[line];
(c = *cp) != NULL; cp = &c->next) {
if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
write_lock_bh(&mrt_lock);
@ -785,7 +784,8 @@ static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock)
line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) {
for (cp = &init_net.ipv4.mfc_cache_array[line];
(c = *cp) != NULL; cp = &c->next) {
if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr)
break;
@ -816,8 +816,8 @@ static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock)
c->mfc_flags |= MFC_STATIC;
write_lock_bh(&mrt_lock);
c->next = mfc_cache_array[line];
mfc_cache_array[line] = c;
c->next = init_net.ipv4.mfc_cache_array[line];
init_net.ipv4.mfc_cache_array[line] = c;
write_unlock_bh(&mrt_lock);
/*
@ -866,7 +866,7 @@ static void mroute_clean_tables(struct sock *sk)
for (i=0; i<MFC_LINES; i++) {
struct mfc_cache *c, **cp;
cp = &mfc_cache_array[i];
cp = &init_net.ipv4.mfc_cache_array[i];
while ((c = *cp) != NULL) {
if (c->mfc_flags&MFC_STATIC) {
cp = &c->next;
@ -1767,10 +1767,11 @@ static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos)
{
struct mfc_cache *mfc;
it->cache = mfc_cache_array;
it->cache = init_net.ipv4.mfc_cache_array;
read_lock(&mrt_lock);
for (it->ct = 0; it->ct < MFC_LINES; it->ct++)
for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next)
for (mfc = init_net.ipv4.mfc_cache_array[it->ct];
mfc; mfc = mfc->next)
if (pos-- == 0)
return mfc;
read_unlock(&mrt_lock);
@ -1812,10 +1813,10 @@ static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
if (it->cache == &mfc_unres_queue)
goto end_of_list;
BUG_ON(it->cache != mfc_cache_array);
BUG_ON(it->cache != init_net.ipv4.mfc_cache_array);
while (++it->ct < MFC_LINES) {
mfc = mfc_cache_array[it->ct];
mfc = init_net.ipv4.mfc_cache_array[it->ct];
if (mfc)
return mfc;
}
@ -1843,7 +1844,7 @@ static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
if (it->cache == &mfc_unres_queue)
spin_unlock_bh(&mfc_unres_lock);
else if (it->cache == mfc_cache_array)
else if (it->cache == init_net.ipv4.mfc_cache_array)
read_unlock(&mrt_lock);
}
@ -1929,12 +1930,26 @@ static int __net_init ipmr_net_init(struct net *net)
err = -ENOMEM;
goto fail;
}
/* Forwarding cache */
net->ipv4.mfc_cache_array = kcalloc(MFC_LINES,
sizeof(struct mfc_cache *),
GFP_KERNEL);
if (!net->ipv4.mfc_cache_array) {
err = -ENOMEM;
goto fail_mfc_cache;
}
return 0;
fail_mfc_cache:
kfree(net->ipv4.vif_table);
fail:
return err;
}
static void __net_exit ipmr_net_exit(struct net *net)
{
kfree(net->ipv4.mfc_cache_array);
kfree(net->ipv4.vif_table);
}