netdev - [PATCH bpf,v6 2/4] bpf: Call __bpf_sk_lookup()/__bpf_skc

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Date: Wed, 21 Jun 2023 13:42:09 +0300
From: Gilad Sever <gilad9366@...il.com>
To: dsahern@...nel.org,
	martin.lau@...ux.dev,
	daniel@...earbox.net,
	john.fastabend@...il.com,
	ast@...nel.org,
	andrii@...nel.org,
	song@...nel.org,
	yhs@...com,
	kpsingh@...nel.org,
	sdf@...gle.com,
	haoluo@...gle.com,
	jolsa@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	mykolal@...com,
	shuah@...nel.org,
	hawk@...nel.org,
	joe@...d.net.nz
Cc: eyal.birger@...il.com,
	shmulik.ladkani@...il.com,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Gilad Sever <gilad9366@...il.com>
Subject: [PATCH bpf,v6 2/4] bpf: Call __bpf_sk_lookup()/__bpf_skc_lookup() directly via TC hookpoint

skb->dev always exists in the tc flow. There is no need to use
bpf_skc_lookup(), bpf_sk_lookup() from this code path.

This change facilitates fixing the tc flow to be VRF aware.

Acked-by: Stanislav Fomichev <sdf@...gle.com>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@...il.com>
Reviewed-by: Eyal Birger <eyal.birger@...il.com>
Signed-off-by: Gilad Sever <gilad9366@...il.com>
---
 net/core/filter.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 57d853460e12..e06547922edc 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6730,8 +6730,12 @@ static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
 BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb,
 	   struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
 {
-	return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP,
-					     netns_id, flags);
+	struct net *caller_net = dev_net(skb->dev);
+	int ifindex = skb->dev->ifindex;
+
+	return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net,
+					       ifindex, IPPROTO_TCP, netns_id,
+					       flags);
 }
 
 static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = {
@@ -6749,8 +6753,12 @@ static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = {
 BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb,
 	   struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
 {
-	return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP,
-					    netns_id, flags);
+	struct net *caller_net = dev_net(skb->dev);
+	int ifindex = skb->dev->ifindex;
+
+	return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net,
+					      ifindex, IPPROTO_TCP, netns_id,
+					      flags);
 }
 
 static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = {
@@ -6768,8 +6776,12 @@ static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = {
 BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb,
 	   struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
 {
-	return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP,
-					    netns_id, flags);
+	struct net *caller_net = dev_net(skb->dev);
+	int ifindex = skb->dev->ifindex;
+
+	return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net,
+					      ifindex, IPPROTO_UDP, netns_id,
+					      flags);
 }
 
 static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = {
-- 
2.34.1