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>
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 8428a0f..35b868d 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -82,8 +82,6 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
{
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 @@
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 @@
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 @@
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);
}