diff mbox series

[bpf-next,v2,4/6] net: remove duplicate sk_lookup helpers

Message ID 20230613-so-reuseport-v2-4-b7c69a342613@isovalent.com
State Superseded
Headers show
Series Add SO_REUSEPORT support for TC bpf_sk_assign | expand

Commit Message

Lorenz Bauer June 13, 2023, 10:14 a.m. UTC 
Now that inet[6]_lookup_reuseport are parameterised on the ehashfn
we can remove two sk_lookup helpers.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
 include/net/inet6_hashtables.h |  9 +++++++++
 include/net/inet_hashtables.h  |  7 +++++++
 net/ipv4/inet_hashtables.c     | 26 +++++++++++++-------------
 net/ipv4/udp.c                 | 32 +++++---------------------------
 net/ipv6/inet6_hashtables.c    | 30 +++++++++++++++---------------
 net/ipv6/udp.c                 | 34 +++++-----------------------------
 6 files changed, 54 insertions(+), 84 deletions(-)

Comments

Kuniyuki Iwashima June 13, 2023, 7:03 p.m. UTC | #1 
From: Lorenz Bauer <lmb@isovalent.com>
Date: Tue, 13 Jun 2023 11:14:59 +0100
> Now that inet[6]_lookup_reuseport are parameterised on the ehashfn
> we can remove two sk_lookup helpers.
> 
> Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
> ---
>  include/net/inet6_hashtables.h |  9 +++++++++
>  include/net/inet_hashtables.h  |  7 +++++++
>  net/ipv4/inet_hashtables.c     | 26 +++++++++++++-------------
>  net/ipv4/udp.c                 | 32 +++++---------------------------
>  net/ipv6/inet6_hashtables.c    | 30 +++++++++++++++---------------
>  net/ipv6/udp.c                 | 34 +++++-----------------------------
>  6 files changed, 54 insertions(+), 84 deletions(-)
> 
> diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
> index 49d586454287..4d2a1a3c0be7 100644
> --- a/include/net/inet6_hashtables.h
> +++ b/include/net/inet6_hashtables.h
> @@ -73,6 +73,15 @@ struct sock *inet6_lookup_listener(struct net *net,
>  				   const unsigned short hnum,
>  				   const int dif, const int sdif);
>  
> +struct sock *inet6_lookup_run_sk_lookup(struct net *net,

I understand this comes from SEC("sk_lookup"), but this sounds
redundant and run_bpf is clearer for non-BPF folks.
diff mbox series

Patch

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index 49d586454287..4d2a1a3c0be7 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -73,6 +73,15 @@  struct sock *inet6_lookup_listener(struct net *net,
 				   const unsigned short hnum,
 				   const int dif, const int sdif);
 
+struct sock *inet6_lookup_run_sk_lookup(struct net *net,
+					int protocol,
+					struct sk_buff *skb, int doff,
+					const struct in6_addr *saddr,
+					const __be16 sport,
+					const struct in6_addr *daddr,
+					const u16 hnum, const int dif,
+					inet6_ehashfn_t ehashfn);
+
 static inline struct sock *__inet6_lookup(struct net *net,
 					  struct inet_hashinfo *hashinfo,
 					  struct sk_buff *skb, int doff,
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 51ab6a1a3601..aa02f1db1f86 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -393,6 +393,13 @@  struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
 				   __be32 daddr, unsigned short hnum,
 				   inet_ehashfn_t ehashfn);
 
+struct sock *inet_lookup_run_sk_lookup(struct net *net,
+				       int protocol,
+				       struct sk_buff *skb, int doff,
+				       __be32 saddr, __be16 sport,
+				       __be32 daddr, u16 hnum, const int dif,
+				       inet_ehashfn_t ehashfn);
+
 static inline struct sock *
 	inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
 				const __be32 saddr, const __be16 sport,
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 1ec895fd9905..47f57b060e9e 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -404,25 +404,23 @@  static struct sock *inet_lhash2_lookup(struct net *net,
 	return result;
 }
 
-static inline struct sock *inet_lookup_run_bpf(struct net *net,
-					       struct inet_hashinfo *hashinfo,
-					       struct sk_buff *skb, int doff,
-					       __be32 saddr, __be16 sport,
-					       __be32 daddr, u16 hnum, const int dif)
+struct sock *inet_lookup_run_sk_lookup(struct net *net,
+				       int protocol,
+				       struct sk_buff *skb, int doff,
+				       __be32 saddr, __be16 sport,
+				       __be32 daddr, u16 hnum, const int dif,
+				       inet_ehashfn_t ehashfn)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
 
-	if (hashinfo != net->ipv4.tcp_death_row.hashinfo)
-		return NULL; /* only TCP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP, saddr, sport,
+	no_reuseport = bpf_sk_lookup_run_v4(net, protocol, saddr, sport,
 					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
 	reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum,
-					 inet_ehashfn);
+					 ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
@@ -440,9 +438,11 @@  struct sock *__inet_lookup_listener(struct net *net,
 	unsigned int hash2;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		result = inet_lookup_run_bpf(net, hashinfo, skb, doff,
-					     saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    hashinfo == net->ipv4.tcp_death_row.hashinfo) {
+		result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
+						   saddr, sport, daddr, hnum, dif,
+						   inet_ehashfn);
 		if (result)
 			goto done;
 	}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 10468fe144d0..2500e92050a0 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -449,30 +449,6 @@  static struct sock *udp4_lib_lookup2(struct net *net,
 	return result;
 }
 
-static struct sock *udp4_lookup_run_bpf(struct net *net,
-					struct udp_table *udptable,
-					struct sk_buff *skb,
-					__be32 saddr, __be16 sport,
-					__be32 daddr, u16 hnum, const int dif)
-{
-	struct sock *sk, *reuse_sk;
-	bool no_reuseport;
-
-	if (udptable != net->ipv4.udp_table)
-		return NULL; /* only UDP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_UDP, saddr, sport,
-					    daddr, hnum, dif, &sk);
-	if (no_reuseport || IS_ERR_OR_NULL(sk))
-		return sk;
-
-	reuse_sk = inet_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
-					 saddr, sport, daddr, hnum, udp_ehashfn);
-	if (reuse_sk)
-		sk = reuse_sk;
-	return sk;
-}
-
 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
  * harder than this. -DaveM
  */
@@ -497,9 +473,11 @@  struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 		goto done;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		sk = udp4_lookup_run_bpf(net, udptable, skb,
-					 saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    udptable == net->ipv4.udp_table) {
+		sk = inet_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr),
+					       saddr, sport, daddr, hnum, dif,
+					       udp_ehashfn);
 		if (sk) {
 			result = sk;
 			goto done;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index a350ee40141c..80bf97669fc9 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -178,27 +178,25 @@  static struct sock *inet6_lhash2_lookup(struct net *net,
 	return result;
 }
 
-static inline struct sock *inet6_lookup_run_bpf(struct net *net,
-						struct inet_hashinfo *hashinfo,
-						struct sk_buff *skb, int doff,
-						const struct in6_addr *saddr,
-						const __be16 sport,
-						const struct in6_addr *daddr,
-						const u16 hnum, const int dif)
+struct sock *inet6_lookup_run_sk_lookup(struct net *net,
+					int protocol,
+					struct sk_buff *skb, int doff,
+					const struct in6_addr *saddr,
+					const __be16 sport,
+					const struct in6_addr *daddr,
+					const u16 hnum, const int dif,
+					inet6_ehashfn_t ehashfn)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
 
-	if (hashinfo != net->ipv4.tcp_death_row.hashinfo)
-		return NULL; /* only TCP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, saddr, sport,
+	no_reuseport = bpf_sk_lookup_run_v6(net, protocol, saddr, sport,
 					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
 	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
-					  saddr, sport, daddr, hnum, inet6_ehashfn);
+					  saddr, sport, daddr, hnum, ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
@@ -216,9 +214,11 @@  struct sock *inet6_lookup_listener(struct net *net,
 	unsigned int hash2;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		result = inet6_lookup_run_bpf(net, hashinfo, skb, doff,
-					      saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    hashinfo == net->ipv4.tcp_death_row.hashinfo) {
+		result = inet6_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
+						    saddr, sport, daddr, hnum, dif,
+						    inet6_ehashfn);
 		if (result)
 			goto done;
 	}
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 2af3a595f38a..961b7e61f02c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -192,32 +192,6 @@  static struct sock *udp6_lib_lookup2(struct net *net,
 	return result;
 }
 
-static inline struct sock *udp6_lookup_run_bpf(struct net *net,
-					       struct udp_table *udptable,
-					       struct sk_buff *skb,
-					       const struct in6_addr *saddr,
-					       __be16 sport,
-					       const struct in6_addr *daddr,
-					       u16 hnum, const int dif)
-{
-	struct sock *sk, *reuse_sk;
-	bool no_reuseport;
-
-	if (udptable != net->ipv4.udp_table)
-		return NULL; /* only UDP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport,
-					    daddr, hnum, dif, &sk);
-	if (no_reuseport || IS_ERR_OR_NULL(sk))
-		return sk;
-
-	reuse_sk = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
-					  saddr, sport, daddr, hnum, udp6_ehashfn);
-	if (reuse_sk)
-		sk = reuse_sk;
-	return sk;
-}
-
 /* rcu_read_lock() must be held */
 struct sock *__udp6_lib_lookup(struct net *net,
 			       const struct in6_addr *saddr, __be16 sport,
@@ -242,9 +216,11 @@  struct sock *__udp6_lib_lookup(struct net *net,
 		goto done;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		sk = udp6_lookup_run_bpf(net, udptable, skb,
-					 saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    udptable == net->ipv4.udp_table) {
+		sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr),
+						saddr, sport, daddr, hnum, dif,
+						udp6_ehashfn);
 		if (sk) {
 			result = sk;
 			goto done;