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-rw-r--r--include/linux/skbuff.h1
-rw-r--r--net/core/flow_dissector.c43
-rw-r--r--net/packet/af_packet.c2
3 files changed, 45 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ee38a4127475..24859d40acde 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1062,6 +1062,7 @@ __skb_set_sw_hash(struct sk_buff *skb, __u32 hash, bool is_l4)
}
void __skb_get_hash(struct sk_buff *skb);
+u32 __skb_get_hash_symmetric(struct sk_buff *skb);
u32 skb_get_poff(const struct sk_buff *skb);
u32 __skb_get_poff(const struct sk_buff *skb, void *data,
const struct flow_keys *keys, int hlen);
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index a669dea146c6..61ad43f61c5e 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -651,6 +651,23 @@ void make_flow_keys_digest(struct flow_keys_digest *digest,
}
EXPORT_SYMBOL(make_flow_keys_digest);
+static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
+
+u32 __skb_get_hash_symmetric(struct sk_buff *skb)
+{
+ struct flow_keys keys;
+
+ __flow_hash_secret_init();
+
+ memset(&keys, 0, sizeof(keys));
+ __skb_flow_dissect(skb, &flow_keys_dissector_symmetric, &keys,
+ NULL, 0, 0, 0,
+ FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
+
+ return __flow_hash_from_keys(&keys, hashrnd);
+}
+EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
+
/**
* __skb_get_hash: calculate a flow hash
* @skb: sk_buff to calculate flow hash from
@@ -868,6 +885,29 @@ static const struct flow_dissector_key flow_keys_dissector_keys[] = {
},
};
+static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
+ {
+ .key_id = FLOW_DISSECTOR_KEY_CONTROL,
+ .offset = offsetof(struct flow_keys, control),
+ },
+ {
+ .key_id = FLOW_DISSECTOR_KEY_BASIC,
+ .offset = offsetof(struct flow_keys, basic),
+ },
+ {
+ .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
+ .offset = offsetof(struct flow_keys, addrs.v4addrs),
+ },
+ {
+ .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
+ .offset = offsetof(struct flow_keys, addrs.v6addrs),
+ },
+ {
+ .key_id = FLOW_DISSECTOR_KEY_PORTS,
+ .offset = offsetof(struct flow_keys, ports),
+ },
+};
+
static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
{
.key_id = FLOW_DISSECTOR_KEY_CONTROL,
@@ -889,6 +929,9 @@ static int __init init_default_flow_dissectors(void)
skb_flow_dissector_init(&flow_keys_dissector,
flow_keys_dissector_keys,
ARRAY_SIZE(flow_keys_dissector_keys));
+ skb_flow_dissector_init(&flow_keys_dissector_symmetric,
+ flow_keys_dissector_symmetric_keys,
+ ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
skb_flow_dissector_init(&flow_keys_buf_dissector,
flow_keys_buf_dissector_keys,
ARRAY_SIZE(flow_keys_buf_dissector_keys));
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 9bff6ef16fa7..9f0983fa4d52 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1341,7 +1341,7 @@ static unsigned int fanout_demux_hash(struct packet_fanout *f,
struct sk_buff *skb,
unsigned int num)
{
- return reciprocal_scale(skb_get_hash(skb), num);
+ return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
}
static unsigned int fanout_demux_lb(struct packet_fanout *f,