netns: ip6mr: dynamically allocate mfc6_cache_array
Preliminary work to make IPv6 multicast forwarding netns-aware.
Dynamically allocates IPv6 multicast forwarding cache, mfc6_cache_array,
and moves it to struct netns_ipv6.
At the moment, mfc6_cache_array is only referenced in init_net.
Replace 'ARRAY_SIZE(mfc6_cache_array)' with mfc6_cache_array size: MFC6_LINES.
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index fab5aba..287e526 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -68,8 +68,6 @@
#define mroute_do_pim 0
#endif
-static struct mfc6_cache *mfc6_cache_array[MFC6_LINES]; /* Forwarding cache */
-
static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
static atomic_t cache_resolve_queue_len; /* Size of unresolved */
@@ -109,10 +107,11 @@
{
struct mfc6_cache *mfc;
- it->cache = mfc6_cache_array;
+ it->cache = init_net.ipv6.mfc6_cache_array;
read_lock(&mrt_lock);
- for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++)
- for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next)
+ for (it->ct = 0; it->ct < MFC6_LINES; it->ct++)
+ for (mfc = init_net.ipv6.mfc6_cache_array[it->ct];
+ mfc; mfc = mfc->next)
if (pos-- == 0)
return mfc;
read_unlock(&mrt_lock);
@@ -243,10 +242,10 @@
if (it->cache == &mfc_unres_queue)
goto end_of_list;
- BUG_ON(it->cache != mfc6_cache_array);
+ BUG_ON(it->cache != init_net.ipv6.mfc6_cache_array);
- while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) {
- mfc = mfc6_cache_array[it->ct];
+ while (++it->ct < MFC6_LINES) {
+ mfc = init_net.ipv6.mfc6_cache_array[it->ct];
if (mfc)
return mfc;
}
@@ -274,7 +273,7 @@
if (it->cache == &mfc_unres_queue)
spin_unlock_bh(&mfc_unres_lock);
- else if (it->cache == mfc6_cache_array)
+ else if (it->cache == init_net.ipv6.mfc6_cache_array)
read_unlock(&mrt_lock);
}
@@ -680,7 +679,7 @@
int line = MFC6_HASH(mcastgrp, origin);
struct mfc6_cache *c;
- for (c = mfc6_cache_array[line]; c; c = c->next) {
+ for (c = init_net.ipv6.mfc6_cache_array[line]; c; c = c->next) {
if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
break;
@@ -925,7 +924,8 @@
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
- for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
+ for (cp = &init_net.ipv6.mfc6_cache_array[line];
+ (c = *cp) != NULL; cp = &c->next) {
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
write_lock_bh(&mrt_lock);
@@ -978,12 +978,26 @@
err = -ENOMEM;
goto fail;
}
+
+ /* Forwarding cache */
+ net->ipv6.mfc6_cache_array = kcalloc(MFC6_LINES,
+ sizeof(struct mfc6_cache *),
+ GFP_KERNEL);
+ if (!net->ipv6.mfc6_cache_array) {
+ err = -ENOMEM;
+ goto fail_mfc6_cache;
+ }
+ return 0;
+
+fail_mfc6_cache:
+ kfree(net->ipv6.vif6_table);
fail:
return err;
}
static void __net_exit ip6mr_net_exit(struct net *net)
{
+ kfree(net->ipv6.mfc6_cache_array);
kfree(net->ipv6.vif6_table);
}
@@ -1062,7 +1076,8 @@
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
- for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
+ for (cp = &init_net.ipv6.mfc6_cache_array[line];
+ (c = *cp) != NULL; cp = &c->next) {
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr))
break;
@@ -1093,8 +1108,8 @@
c->mfc_flags |= MFC_STATIC;
write_lock_bh(&mrt_lock);
- c->next = mfc6_cache_array[line];
- mfc6_cache_array[line] = c;
+ c->next = init_net.ipv6.mfc6_cache_array[line];
+ init_net.ipv6.mfc6_cache_array[line] = c;
write_unlock_bh(&mrt_lock);
/*
@@ -1140,10 +1155,10 @@
/*
* Wipe the cache
*/
- for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) {
+ for (i = 0; i < MFC6_LINES; i++) {
struct mfc6_cache *c, **cp;
- cp = &mfc6_cache_array[i];
+ cp = &init_net.ipv6.mfc6_cache_array[i];
while ((c = *cp) != NULL) {
if (c->mfc_flags & MFC_STATIC) {
cp = &c->next;