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net: Make flow cache namespace-aware

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flow_cache_lookup will return a cached object (or null pointer) that the
resolver (i.e. xfrm_policy_lookup) previously found for another namespace
using the same key/family/dir.  Instead, make the namespace part of what
identifies entries in the cache.

As before, flow_entry_valid will return 0 for entries where the namespace
has been deleted, and they will be removed from the cache the next time
flow_cache_gc_task is run.

Reported-by: Andrew Dickinson <whydna@whydna.net>
Signed-off-by: David Ward <david.ward@ll.mit.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
dpward 2011-08-31 06:05:27 +00:00 committed by David S. Miller
parent 02009afc22
commit 0542b69e2c
1 changed files with 4 additions and 1 deletions
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5
net/core/flow.c
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@ -30,6 +30,7 @@ struct flow_cache_entry {
struct hlist_node hlist; struct hlist_node hlist;
struct list_head gc_list; struct list_head gc_list;
} u; } u;
struct net *net;
u16 family; u16 family;
u8 dir; u8 dir;
u32 genid; u32 genid;
@ -232,7 +233,8 @@ flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
hash = flow_hash_code(fc, fcp, key); hash = flow_hash_code(fc, fcp, key);
hlist_for_each_entry(tfle, entry, &fcp->hash_table[hash], u.hlist) { hlist_for_each_entry(tfle, entry, &fcp->hash_table[hash], u.hlist) {
if (tfle->family == family && if (tfle->net == net &&
tfle->family == family &&
tfle->dir == dir && tfle->dir == dir &&
flow_key_compare(key, &tfle->key) == 0) { flow_key_compare(key, &tfle->key) == 0) {
fle = tfle; fle = tfle;
@ -246,6 +248,7 @@ flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
fle = kmem_cache_alloc(flow_cachep, GFP_ATOMIC); fle = kmem_cache_alloc(flow_cachep, GFP_ATOMIC);
if (fle) { if (fle) {
fle->net = net;
fle->family = family; fle->family = family;
fle->dir = dir; fle->dir = dir;
memcpy(&fle->key, key, sizeof(*key)); memcpy(&fle->key, key, sizeof(*key));