netns: ip6mr: declare counter cache_resolve_queue_len per-namespace
Preliminary work to make IPv6 multicast forwarding netns-aware.
Declare variable cache_resolve_queue_len per-namespace: moves it into
struct netns_ipv6.
This variable counts the number of unresolved cache entries queued in the
list mfc_unres_queue. This list is kept global to all netns as the number
of entries per namespace is limited to 10 (hardcoded in routine
ip6mr_cache_unresolved).
Entries belonging to different namespaces in mfc_unres_queue will be
identified by matching the mfc_net member introduced previously in
struct mfc6_cache.
Keeping this list global to all netns, also allows us to keep a single
timer (ipmr_expire_timer) to handle their expiration.
In some places cache_resolve_queue_len value was tested for arming
or deleting the timer. These tests were equivalent to testing
mfc_unres_queue value instead and are replaced in this patch.
At the moment, cache_resolve_queue_len 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/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 287e526..077c819 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -69,7 +69,6 @@
#endif
static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
-static atomic_t cache_resolve_queue_len; /* Size of unresolved */
/* Special spinlock for queue of unresolved entries */
static DEFINE_SPINLOCK(mfc_unres_lock);
@@ -519,7 +518,7 @@
{
struct sk_buff *skb;
- atomic_dec(&cache_resolve_queue_len);
+ atomic_dec(&init_net.ipv6.cache_resolve_queue_len);
while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
if (ipv6_hdr(skb)->version == 0) {
@@ -561,7 +560,7 @@
ip6mr_destroy_unres(c);
}
- if (atomic_read(&cache_resolve_queue_len))
+ if (mfc_unres_queue != NULL)
mod_timer(&ipmr_expire_timer, jiffies + expires);
}
@@ -572,7 +571,7 @@
return;
}
- if (atomic_read(&cache_resolve_queue_len))
+ if (mfc_unres_queue != NULL)
ipmr_do_expire_process(dummy);
spin_unlock(&mfc_unres_lock);
@@ -852,7 +851,8 @@
spin_lock_bh(&mfc_unres_lock);
for (c = mfc_unres_queue; c; c = c->next) {
- if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
+ if (net_eq(mfc6_net(c), &init_net) &&
+ ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr))
break;
}
@@ -862,7 +862,7 @@
* Create a new entry if allowable
*/
- if (atomic_read(&cache_resolve_queue_len) >= 10 ||
+ if (atomic_read(&init_net.ipv6.cache_resolve_queue_len) >= 10 ||
(c = ip6mr_cache_alloc_unres(&init_net)) == NULL) {
spin_unlock_bh(&mfc_unres_lock);
@@ -891,7 +891,7 @@
return err;
}
- atomic_inc(&cache_resolve_queue_len);
+ atomic_inc(&init_net.ipv6.cache_resolve_queue_len);
c->next = mfc_unres_queue;
mfc_unres_queue = c;
@@ -1119,14 +1119,16 @@
spin_lock_bh(&mfc_unres_lock);
for (cp = &mfc_unres_queue; (uc = *cp) != NULL;
cp = &uc->next) {
- if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
+ if (net_eq(mfc6_net(uc), &init_net) &&
+ ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
*cp = uc->next;
- if (atomic_dec_and_test(&cache_resolve_queue_len))
- del_timer(&ipmr_expire_timer);
+ atomic_dec(&init_net.ipv6.cache_resolve_queue_len);
break;
}
}
+ if (mfc_unres_queue == NULL)
+ del_timer(&ipmr_expire_timer);
spin_unlock_bh(&mfc_unres_lock);
if (uc) {
@@ -1172,18 +1174,18 @@
}
}
- if (atomic_read(&cache_resolve_queue_len) != 0) {
- struct mfc6_cache *c;
+ if (atomic_read(&init_net.ipv6.cache_resolve_queue_len) != 0) {
+ struct mfc6_cache *c, **cp;
spin_lock_bh(&mfc_unres_lock);
- while (mfc_unres_queue != NULL) {
- c = mfc_unres_queue;
- mfc_unres_queue = c->next;
- spin_unlock_bh(&mfc_unres_lock);
-
+ cp = &mfc_unres_queue;
+ while ((c = *cp) != NULL) {
+ if (!net_eq(mfc6_net(c), &init_net)) {
+ cp = &c->next;
+ continue;
+ }
+ *cp = c->next;
ip6mr_destroy_unres(c);
-
- spin_lock_bh(&mfc_unres_lock);
}
spin_unlock_bh(&mfc_unres_lock);
}