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From: Jakub Sitnicki <jakub@cloudflare.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: dccp@vger.kernel.org, kernel-team@cloudflare.com,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Gerrit Renker <gerrit@erg.abdn.ac.uk>,
	Jakub Kicinski <kuba@kernel.org>,
	Andrii Nakryiko <andrii.nakryiko@gmail.com>,
	Martin KaFai Lau <kafai@fb.com>
Subject: [PATCH bpf-next v2 04/17] inet: Extract helper for selecting socket from reuseport group
Date: Mon, 11 May 2020 20:52:05 +0200	[thread overview]
Message-ID: <20200511185218.1422406-5-jakub@cloudflare.com> (raw)
In-Reply-To: <20200511185218.1422406-1-jakub@cloudflare.com>

Prepare for calling into reuseport from __inet_lookup_listener as well.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
 net/ipv4/inet_hashtables.c | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 2bbaaf0c7176..ab64834837c8 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -246,6 +246,21 @@ static inline 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, int doff,
+					    __be32 saddr, __be16 sport,
+					    __be32 daddr, unsigned short hnum)
+{
+	struct sock *reuse_sk = NULL;
+	u32 phash;
+
+	if (sk->sk_reuseport) {
+		phash = inet_ehashfn(net, daddr, hnum, saddr, sport);
+		reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
+	}
+	return reuse_sk;
+}
+
 /*
  * Here are some nice properties to exploit here. The BSD API
  * does not allow a listening sock to specify the remote port nor the
@@ -265,21 +280,17 @@ static struct sock *inet_lhash2_lookup(struct net *net,
 	struct inet_connection_sock *icsk;
 	struct sock *sk, *result = NULL;
 	int score, hiscore = 0;
-	u32 phash = 0;
 
 	inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
 		sk = (struct sock *)icsk;
 		score = compute_score(sk, net, hnum, daddr,
 				      dif, sdif, exact_dif);
 		if (score > hiscore) {
-			if (sk->sk_reuseport) {
-				phash = inet_ehashfn(net, daddr, hnum,
-						     saddr, sport);
-				result = reuseport_select_sock(sk, phash,
-							       skb, doff);
-				if (result)
-					return result;
-			}
+			result = lookup_reuseport(net, sk, skb, doff,
+						  saddr, sport, daddr, hnum);
+			if (result)
+				return result;
+
 			result = sk;
 			hiscore = score;
 		}
-- 
2.25.3


WARNING: multiple messages have this Message-ID (diff)
From: Jakub Sitnicki <jakub@cloudflare.com>
To: dccp@vger.kernel.org
Subject: [PATCH bpf-next v2 04/17] inet: Extract helper for selecting socket from reuseport group
Date: Mon, 11 May 2020 18:52:05 +0000	[thread overview]
Message-ID: <20200511185218.1422406-5-jakub@cloudflare.com> (raw)

Prepare for calling into reuseport from __inet_lookup_listener as well.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
 net/ipv4/inet_hashtables.c | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 2bbaaf0c7176..ab64834837c8 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -246,6 +246,21 @@ static inline 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, int doff,
+					    __be32 saddr, __be16 sport,
+					    __be32 daddr, unsigned short hnum)
+{
+	struct sock *reuse_sk = NULL;
+	u32 phash;
+
+	if (sk->sk_reuseport) {
+		phash = inet_ehashfn(net, daddr, hnum, saddr, sport);
+		reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
+	}
+	return reuse_sk;
+}
+
 /*
  * Here are some nice properties to exploit here. The BSD API
  * does not allow a listening sock to specify the remote port nor the
@@ -265,21 +280,17 @@ static struct sock *inet_lhash2_lookup(struct net *net,
 	struct inet_connection_sock *icsk;
 	struct sock *sk, *result = NULL;
 	int score, hiscore = 0;
-	u32 phash = 0;
 
 	inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
 		sk = (struct sock *)icsk;
 		score = compute_score(sk, net, hnum, daddr,
 				      dif, sdif, exact_dif);
 		if (score > hiscore) {
-			if (sk->sk_reuseport) {
-				phash = inet_ehashfn(net, daddr, hnum,
-						     saddr, sport);
-				result = reuseport_select_sock(sk, phash,
-							       skb, doff);
-				if (result)
-					return result;
-			}
+			result = lookup_reuseport(net, sk, skb, doff,
+						  saddr, sport, daddr, hnum);
+			if (result)
+				return result;
+
 			result = sk;
 			hiscore = score;
 		}
-- 
2.25.3

  parent reply	other threads:[~2020-05-11 18:52 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 18:52 [PATCH bpf-next v2 00/17] Run a BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52 ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 01/17] flow_dissector: Extract attach/detach/query helpers Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 02/17] bpf: Introduce SK_LOOKUP program type with a dedicated attach point Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 19:06   ` Jakub Sitnicki
2020-05-11 19:06     ` Jakub Sitnicki
2020-05-13  5:41   ` Martin KaFai Lau
2020-05-13  5:41     ` Martin KaFai Lau
2020-05-13 14:34     ` Jakub Sitnicki
2020-05-13 14:34       ` Jakub Sitnicki
2020-05-13 18:10       ` Martin KaFai Lau
2020-05-13 18:10         ` Martin KaFai Lau
2020-05-11 18:52 ` [PATCH bpf-next v2 03/17] inet: Store layer 4 protocol in inet_hashinfo Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` Jakub Sitnicki [this message]
2020-05-11 18:52   ` [PATCH bpf-next v2 04/17] inet: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 05/17] inet: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 20:44   ` Alexei Starovoitov
2020-05-11 20:44     ` Alexei Starovoitov
2020-05-12 13:52     ` Jakub Sitnicki
2020-05-12 13:52       ` Jakub Sitnicki
2020-05-12 23:58       ` Alexei Starovoitov
2020-05-12 23:58         ` Alexei Starovoitov
2020-05-13 13:55         ` Jakub Sitnicki
2020-05-13 13:55           ` Jakub Sitnicki
2020-05-13 14:21       ` Lorenz Bauer
2020-05-13 14:21         ` Lorenz Bauer
2020-05-13 14:50         ` Jakub Sitnicki
2020-05-13 14:50           ` Jakub Sitnicki
2020-05-15 12:28     ` Jakub Sitnicki
2020-05-15 12:28       ` Jakub Sitnicki
2020-05-15 15:07       ` Alexei Starovoitov
2020-05-15 15:07         ` Alexei Starovoitov
2020-05-11 18:52 ` [PATCH bpf-next v2 06/17] inet6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 07/17] inet6: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 08/17] udp: Store layer 4 protocol in udp_table Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 09/17] udp: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 10/17] udp: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 11/17] udp6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 12/17] udp6: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 13/17] bpf: Sync linux/bpf.h to tools/ Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 14/17] libbpf: Add support for SK_LOOKUP program type Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 15/17] selftests/bpf: Add verifier tests for bpf_sk_lookup context access Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 16/17] selftests/bpf: Rename test_sk_lookup_kern.c to test_ref_track_kern.c Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 17/17] selftests/bpf: Tests for BPF_SK_LOOKUP attach point Jakub Sitnicki
2020-05-11 18:52   ` Jakub Sitnicki
2020-05-11 19:45 ` [PATCH bpf-next v2 00/17] Run a BPF program on socket lookup Martin KaFai Lau
2020-05-11 19:45   ` Martin KaFai Lau
2020-05-12 11:57   ` Jakub Sitnicki
2020-05-12 11:57     ` Jakub Sitnicki
2020-05-12 16:34     ` Martin KaFai Lau
2020-05-12 16:34       ` Martin KaFai Lau
2020-05-13 17:54       ` Jakub Sitnicki
2020-05-13 17:54         ` Jakub Sitnicki

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