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

Lorenz Bauer
2023-06-13T10:15:25Z

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,
+ 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;

--
2.40.1