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From: Jakub Sitnicki <jakub@cloudflare.com>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, kernel-team@cloudflare.com,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH bpf-next v5 09/15] udp6: Extract helper for selecting socket from reuseport group
Date: Fri, 17 Jul 2020 12:35:30 +0200	[thread overview]
Message-ID: <20200717103536.397595-10-jakub@cloudflare.com> (raw)
In-Reply-To: <20200717103536.397595-1-jakub@cloudflare.com>

Prepare for calling into reuseport from __udp6_lib_lookup as well.

Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
 net/ipv6/udp.c | 37 ++++++++++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 38c0d9350c6b..084205c18a33 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -141,6 +141,27 @@ static int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
+static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
+					    struct sk_buff *skb,
+					    const struct in6_addr *saddr,
+					    __be16 sport,
+					    const struct in6_addr *daddr,
+					    unsigned int hnum)
+{
+	struct sock *reuse_sk = NULL;
+	u32 hash;
+
+	if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
+		hash = udp6_ehashfn(net, daddr, hnum, saddr, sport);
+		reuse_sk = reuseport_select_sock(sk, hash, skb,
+						 sizeof(struct udphdr));
+		/* Fall back to scoring if group has connections */
+		if (reuseport_has_conns(sk, false))
+			return NULL;
+	}
+	return reuse_sk;
+}
+
 /* called with rcu_read_lock() */
 static struct sock *udp6_lib_lookup2(struct net *net,
 		const struct in6_addr *saddr, __be16 sport,
@@ -150,7 +171,6 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 {
 	struct sock *sk, *result;
 	int score, badness;
-	u32 hash = 0;
 
 	result = NULL;
 	badness = -1;
@@ -158,16 +178,11 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 		score = compute_score(sk, net, saddr, sport,
 				      daddr, hnum, dif, sdif);
 		if (score > badness) {
-			if (sk->sk_reuseport &&
-			    sk->sk_state != TCP_ESTABLISHED) {
-				hash = udp6_ehashfn(net, daddr, hnum,
-						    saddr, sport);
-
-				result = reuseport_select_sock(sk, hash, skb,
-							sizeof(struct udphdr));
-				if (result && !reuseport_has_conns(sk, false))
-					return result;
-			}
+			result = lookup_reuseport(net, sk, skb,
+						  saddr, sport, daddr, hnum);
+			if (result)
+				return result;
+
 			result = sk;
 			badness = score;
 		}
-- 
2.25.4


  parent reply	other threads:[~2020-07-17 10:36 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17 10:35 [PATCH bpf-next v5 00/15] Run a BPF program on socket lookup Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 01/15] bpf, netns: Handle multiple link attachments Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 02/15] bpf: Introduce SK_LOOKUP program type with a dedicated attach point Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 03/15] inet: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 04/15] inet: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 05/15] inet6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 06/15] inet6: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 07/15] udp: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 08/15] udp: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-07-17 10:35 ` Jakub Sitnicki [this message]
2020-07-17 10:35 ` [PATCH bpf-next v5 10/15] udp6: " Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 11/15] bpf: Sync linux/bpf.h to tools/ Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 12/15] libbpf: Add support for SK_LOOKUP program type Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 13/15] tools/bpftool: Add name mappings for SK_LOOKUP prog and attach type Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 14/15] selftests/bpf: Add verifier tests for bpf_sk_lookup context access Jakub Sitnicki
2020-07-17 10:35 ` [PATCH bpf-next v5 15/15] selftests/bpf: Tests for BPF_SK_LOOKUP attach point Jakub Sitnicki
2020-07-28 20:13   ` Andrii Nakryiko
2020-07-28 20:47     ` Daniel Borkmann
2020-07-29  8:55       ` Jakub Sitnicki
2020-07-31  0:04         ` Daniel Borkmann
2020-07-29  8:57     ` Jakub Sitnicki
2020-07-30 13:10       ` Jakub Sitnicki
2020-07-30 19:43         ` Andrii Nakryiko
2020-07-17 16:40 ` [PATCH bpf-next v5 00/15] Run a BPF program on socket lookup Lorenz Bauer
2020-07-18  3:25   ` Alexei Starovoitov
2020-08-18 15:49 ` BPF sk_lookup v5 - TCP SYN and UDP 0-len flood benchmarks Jakub Sitnicki
2020-08-18 18:19   ` Alexei Starovoitov
2020-08-20 10:29     ` Jakub Sitnicki
2020-08-20 12:20       ` David Laight
2020-08-20 22:18       ` Alexei Starovoitov
2020-08-21 10:22         ` Jakub Sitnicki
2020-08-24  8:17     ` Paolo Abeni

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