From: Gilad Sever <gilad9366@gmail.com>
Date: Wed, 21 Jun 2023 10:42:09 +0000 (+0300)
Subject: bpf: Call __bpf_sk_lookup()/__bpf_skc_lookup() directly via TC hookpoint
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=97fbfeb86917bdbe9c41d5143e335a929147f405;p=linux.git

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.

Signed-off-by: Gilad Sever <gilad9366@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Reviewed-by: Eyal Birger <eyal.birger@gmail.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20230621104211.301902-3-gilad9366@gmail.com
---

diff --git a/net/core/filter.c b/net/core/filter.c
index 11e2afbfdce90..a9fb897822b2d 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6743,8 +6743,12 @@ 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 = {
@@ -6762,8 +6766,12 @@ 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 = {
@@ -6781,8 +6789,12 @@ 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 = {