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netfilter: nf_flow_table_offload: check the status of dst_neigh 

It is better to get the dst_neigh with neigh->lock and check the
nud_state is VALID. If there is not neigh previous, the lookup will
Create a non NUD_VALID with 00:00:00:00:00:00 mac.

Fixes: c29f74e0df ("netfilter: nf_flow_table: hardware offload support")
Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
wenxu 2019-12-20 12:14:37 +08:00 committed by Pablo Neira Ayuso
parent 1b67e50601
commit f31ad71c44
1 changed files with 14 additions and 2 deletions
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16
net/netfilter/nf_flow_table_offload.c
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@ -170,8 +170,10 @@ static int flow_offload_eth_dst(struct net *net,
struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule);
const void *daddr = &flow->tuplehash[!dir].tuple.src_v4;
const struct dst_entry *dst_cache;
unsigned char ha[ETH_ALEN];
struct neighbour *n;
u32 mask, val;
u8 nud_state;
u16 val16;
dst_cache = flow->tuplehash[dir].tuple.dst_cache;
@ -179,13 +181,23 @@ static int flow_offload_eth_dst(struct net *net,
if (!n)
return -ENOENT;
read_lock_bh(&n->lock);
nud_state = n->nud_state;
ether_addr_copy(ha, n->ha);
read_unlock_bh(&n->lock);
if (!(nud_state & NUD_VALID)) {
neigh_release(n);
return -ENOENT;
}
mask = ~0xffffffff;
memcpy(&val, n->ha, 4);
memcpy(&val, ha, 4);
flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 0,
&val, &mask);
mask = ~0x0000ffff;
memcpy(&val16, n->ha + 4, 2);
memcpy(&val16, ha + 4, 2);
val = val16;
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
&val, &mask);