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netfilter: nf_queue: place bridge physports into queue_entry struct

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The refcount is done via entry->skb, which does work fine.
Major problem: When putting the refcount of the bridge ports, we
must always put the references while the skb is still around.

However, we will need to put the references after okfn() to avoid
a possible 1 -> 0 -> 1 refcount transition, so we cannot use the
skb pointer anymore.

Place the physports in the queue entry structure instead to allow
for refcounting changes in the next patch.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2020-03-27 03:24:47 +01:00 committed by Pablo Neira Ayuso
parent dd3cc111f2
commit 119e52e664
2 changed files with 27 additions and 31 deletions
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5
include/net/netfilter/nf_queue.h
View file

@ -14,7 +14,10 @@ struct nf_queue_entry {
struct sk_buff *skb;
unsigned int id;
unsigned int hook_index; /* index in hook_entries->hook[] */
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct net_device *physin;
struct net_device *physout;
#endif
struct nf_hook_state state;
u16 size; /* sizeof(entry) + saved route keys */

53
net/netfilter/nf_queue.c
View file

@ -46,24 +46,6 @@ void nf_unregister_queue_handler(struct net *net)
}
EXPORT_SYMBOL(nf_unregister_queue_handler);
static void nf_queue_entry_release_br_nf_refs(struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(skb);
if (physdev)
dev_put(physdev);
physdev = nf_bridge_get_physoutdev(skb);
if (physdev)
dev_put(physdev);
}
#endif
}
static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
{
struct nf_hook_state *state = &entry->state;
@ -76,7 +58,12 @@ static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
if (state->sk)
sock_put(state->sk);
nf_queue_entry_release_br_nf_refs(entry->skb);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->physin)
dev_put(entry->physin);
if (entry->physout)
dev_put(entry->physout);
#endif
}
void nf_queue_entry_free(struct nf_queue_entry *entry)
@ -86,20 +73,19 @@ void nf_queue_entry_free(struct nf_queue_entry *entry)
}
EXPORT_SYMBOL_GPL(nf_queue_entry_free);
static void nf_queue_entry_get_br_nf_refs(struct sk_buff *skb)
static void __nf_queue_entry_init_physdevs(struct nf_queue_entry *entry)
{
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
const struct sk_buff *skb = entry->skb;
struct nf_bridge_info *nf_bridge;
nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(skb);
if (physdev)
dev_hold(physdev);
physdev = nf_bridge_get_physoutdev(skb);
if (physdev)
dev_hold(physdev);
entry->physin = nf_bridge_get_physindev(skb);
entry->physout = nf_bridge_get_physoutdev(skb);
} else {
entry->physin = NULL;
entry->physout = NULL;
}
#endif
}
@ -116,7 +102,12 @@ void nf_queue_entry_get_refs(struct nf_queue_entry *entry)
if (state->sk)
sock_hold(state->sk);
nf_queue_entry_get_br_nf_refs(entry->skb);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->physin)
dev_hold(entry->physin);
if (entry->physout)
dev_hold(entry->physout);
#endif
}
EXPORT_SYMBOL_GPL(nf_queue_entry_get_refs);
@ -207,6 +198,8 @@ static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
.size = sizeof(*entry) + route_key_size,
};
__nf_queue_entry_init_physdevs(entry);
nf_queue_entry_get_refs(entry);
switch (entry->state.pf) {