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netns: ip6mr: dynamically allocate mfc6_cache_array

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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>
This commit is contained in:
Benjamin Thery 2008-12-10 16:24:07 -08:00 • committed by David S. Miller
parent 58701ad411
commit 4a6258a0e3
2 changed files with 32 additions and 16 deletions
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1
include/net/netns/ipv6.h
View file

@ -57,6 +57,7 @@ struct netns_ipv6 {
struct sock *igmp_sk; struct sock *igmp_sk;
#ifdef CONFIG_IPV6_MROUTE #ifdef CONFIG_IPV6_MROUTE
struct sock *mroute6_sk; struct sock *mroute6_sk;
struct mfc6_cache **mfc6_cache_array;
struct mif_device *vif6_table; struct mif_device *vif6_table;
int maxvif; int maxvif;
#endif #endif

47
net/ipv6/ip6mr.c
View file

@ -68,8 +68,6 @@ static int mroute_do_pim;
#define mroute_do_pim 0 #define mroute_do_pim 0
#endif #endif
static struct mfc6_cache *mfc6_cache_array[MFC6_LINES]; /* Forwarding cache */
static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */ static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
static atomic_t cache_resolve_queue_len; /* Size of unresolved */ static atomic_t cache_resolve_queue_len; /* Size of unresolved */
@ -109,10 +107,11 @@ static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos)
{ {
struct mfc6_cache *mfc; struct mfc6_cache *mfc;
it->cache = mfc6_cache_array; it->cache = init_net.ipv6.mfc6_cache_array;
read_lock(&mrt_lock); read_lock(&mrt_lock);
for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++) for (it->ct = 0; it->ct < MFC6_LINES; it->ct++)
for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next) for (mfc = init_net.ipv6.mfc6_cache_array[it->ct];
mfc; mfc = mfc->next)
if (pos-- == 0) if (pos-- == 0)
return mfc; return mfc;
read_unlock(&mrt_lock); read_unlock(&mrt_lock);
@ -243,10 +242,10 @@ static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
if (it->cache == &mfc_unres_queue) if (it->cache == &mfc_unres_queue)
goto end_of_list; 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)) { while (++it->ct < MFC6_LINES) {
mfc = mfc6_cache_array[it->ct]; mfc = init_net.ipv6.mfc6_cache_array[it->ct];
if (mfc) if (mfc)
return mfc; return mfc;
} }
@ -274,7 +273,7 @@ static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
if (it->cache == &mfc_unres_queue) if (it->cache == &mfc_unres_queue)
spin_unlock_bh(&mfc_unres_lock); 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); read_unlock(&mrt_lock);
} }
@ -680,7 +679,7 @@ static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_a
int line = MFC6_HASH(mcastgrp, origin); int line = MFC6_HASH(mcastgrp, origin);
struct mfc6_cache *c; 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) && if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
break; break;
@ -925,7 +924,8 @@ static int ip6mr_mfc_delete(struct mf6cctl *mfc)
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); 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) && if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
write_lock_bh(&mrt_lock); write_lock_bh(&mrt_lock);
@ -978,12 +978,26 @@ static int __net_init ip6mr_net_init(struct net *net)
err = -ENOMEM; err = -ENOMEM;
goto fail; 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: fail:
return err; return err;
} }
static void __net_exit ip6mr_net_exit(struct net *net) static void __net_exit ip6mr_net_exit(struct net *net)
{ {
kfree(net->ipv6.mfc6_cache_array);
kfree(net->ipv6.vif6_table); kfree(net->ipv6.vif6_table);
} }
@ -1062,7 +1076,8 @@ static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock)
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); 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) && if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr))
break; break;
@ -1093,8 +1108,8 @@ static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock)
c->mfc_flags |= MFC_STATIC; c->mfc_flags |= MFC_STATIC;
write_lock_bh(&mrt_lock); write_lock_bh(&mrt_lock);
c->next = mfc6_cache_array[line]; c->next = init_net.ipv6.mfc6_cache_array[line];
mfc6_cache_array[line] = c; init_net.ipv6.mfc6_cache_array[line] = c;
write_unlock_bh(&mrt_lock); write_unlock_bh(&mrt_lock);
/* /*
@ -1140,10 +1155,10 @@ static void mroute_clean_tables(struct sock *sk)
/* /*
* Wipe the cache * 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; struct mfc6_cache *c, **cp;
cp = &mfc6_cache_array[i]; cp = &init_net.ipv6.mfc6_cache_array[i];
while ((c = *cp) != NULL) { while ((c = *cp) != NULL) {
if (c->mfc_flags & MFC_STATIC) { if (c->mfc_flags & MFC_STATIC) {
cp = &c->next; cp = &c->next;