The high-level netfilter hook API already enables users to pass a socket,
but that information is lost when the chains are walked.
In order to let internal eval callbacks use the passed filter rather than
skb->sk, add a pointer of type 'struct sock' to 'struct nft_pktinfo' and
set that field via nft_set_pktinfo().
This allows us to run filter chains from situations where skb->sk is unset.
Fall back to skb->sk in case state->sk is NULL, so filter callbacks can be
written in a generic way.
Signed-off-by: Daniel Mack <dan...@zonque.org>
---
include/net/netfilter/nf_tables.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/net/netfilter/nf_tables.h
b/include/net/netfilter/nf_tables.h
index aa8bee7..05e97ed 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -13,6 +13,7 @@
#define NFT_JUMP_STACK_SIZE 16
struct nft_pktinfo {
+ struct sock *sk;
struct sk_buff *skb;
const struct net_device *in;
const struct net_device *out;
@@ -29,6 +30,7 @@ static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
+ pkt->sk = state->sk ?: skb->sk;
pkt->skb = skb;
pkt->in = pkt->xt.in = state->in;
pkt->out = pkt->xt.out = state->out;
--
2.5.0
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