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netns: ipmr: store netns in struct mfc_cache

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This patch stores into struct mfc_cache the network namespace each
mfc_cache belongs to. The new member is mfc_net.

mfc_net is assigned at cache allocation and doesn't change during
the rest of the cache entry life.
A new net parameter is added to ipmr_cache_alloc/ipmr_cache_alloc_unres.

This will help to retrieve the current netns around the IPv4 multicast
routing code.

At the moment, all mfc_cache are allocated 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 04:56:17 +00:00 committed by David S. Miller
parent cf958ae377
commit 5c0a66f5f3
2 changed files with 32 additions and 9 deletions
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15
include/linux/mroute.h
View File

@ -193,6 +193,9 @@ struct vif_device
struct mfc_cache
{
struct mfc_cache *next; /* Next entry on cache line */
#ifdef CONFIG_NET_NS
struct net *mfc_net;
#endif
__be32 mfc_mcastgrp; /* Group the entry belongs to */
__be32 mfc_origin; /* Source of packet */
vifi_t mfc_parent; /* Source interface */
@ -215,6 +218,18 @@ struct mfc_cache
} mfc_un;
};
static inline
struct net *mfc_net(const struct mfc_cache *mfc)
{
return read_pnet(&mfc->mfc_net);
}
static inline
void mfc_net_set(struct mfc_cache *mfc, struct net *net)
{
write_pnet(&mfc->mfc_net, hold_net(net));
}
#define MFC_STATIC 1
#define MFC_NOTIFY 2

26
net/ipv4/ipmr.c
View File

@ -327,6 +327,12 @@ static int vif_delete(int vifi, int notify)
return 0;
}
static inline void ipmr_cache_free(struct mfc_cache *c)
{
release_net(mfc_net(c));
kmem_cache_free(mrt_cachep, c);
}
/* Destroy an unresolved cache entry, killing queued skbs
and reporting error to netlink readers.
*/
@ -353,7 +359,7 @@ static void ipmr_destroy_unres(struct mfc_cache *c)
kfree_skb(skb);
}
kmem_cache_free(mrt_cachep, c);
ipmr_cache_free(c);
}
@ -528,22 +534,24 @@ static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp)
/*
* Allocate a multicast cache entry
*/
static struct mfc_cache *ipmr_cache_alloc(void)
static struct mfc_cache *ipmr_cache_alloc(struct net *net)
{
struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
if (c == NULL)
return NULL;
c->mfc_un.res.minvif = MAXVIFS;
mfc_net_set(c, net);
return c;
}
static struct mfc_cache *ipmr_cache_alloc_unres(void)
static struct mfc_cache *ipmr_cache_alloc_unres(struct net *net)
{
struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
if (c == NULL)
return NULL;
skb_queue_head_init(&c->mfc_un.unres.unresolved);
c->mfc_un.unres.expires = jiffies + 10*HZ;
mfc_net_set(c, net);
return c;
}
@ -695,7 +703,7 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
*/
if (atomic_read(&cache_resolve_queue_len) >= 10 ||
(c=ipmr_cache_alloc_unres())==NULL) {
(c = ipmr_cache_alloc_unres(&init_net)) == NULL) {
spin_unlock_bh(&mfc_unres_lock);
kfree_skb(skb);
@ -718,7 +726,7 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
*/
spin_unlock_bh(&mfc_unres_lock);
kmem_cache_free(mrt_cachep, c);
ipmr_cache_free(c);
kfree_skb(skb);
return err;
}
@ -763,7 +771,7 @@ static int ipmr_mfc_delete(struct mfcctl *mfc)
*cp = c->next;
write_unlock_bh(&mrt_lock);
kmem_cache_free(mrt_cachep, c);
ipmr_cache_free(c);
return 0;
}
}
@ -796,7 +804,7 @@ static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock)
if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
return -EINVAL;
c = ipmr_cache_alloc();
c = ipmr_cache_alloc(&init_net);
if (c == NULL)
return -ENOMEM;
@ -831,7 +839,7 @@ static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock)
if (uc) {
ipmr_cache_resolve(uc, c);
kmem_cache_free(mrt_cachep, uc);
ipmr_cache_free(uc);
}
return 0;
}
@ -868,7 +876,7 @@ static void mroute_clean_tables(struct sock *sk)
*cp = c->next;
write_unlock_bh(&mrt_lock);
kmem_cache_free(mrt_cachep, c);
ipmr_cache_free(c);
}
}