net: export inet_lookup_reuseport and inet6_lookup_reuseport

Rename the existing reuseport helpers for IPv4 and IPv6 so that they
can be invoked in the follow up commit. Export them so that building
DCCP and IPv6 as a module works.

No change in functionality.

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Link: https://lore.kernel.org/r/20230720-so-reuseport-v6-3-7021b683cdae@isovalent.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index 56f1286..032ddab 100644 (file)
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -48,6 +48,13 @@ struct sock *__inet6_lookup_established(struct net *net,
                                        const u16 hnum, const int dif,
                                        const int sdif);
 
+struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
+                                   struct sk_buff *skb, int doff,
+                                   const struct in6_addr *saddr,
+                                   __be16 sport,
+                                   const struct in6_addr *daddr,
+                                   unsigned short hnum);
+
 struct sock *inet6_lookup_listener(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 99bd823..8734f34 100644 (file)
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -379,6 +379,11 @@ struct sock *__inet_lookup_established(struct net *net,
                                       const __be32 daddr, const u16 hnum,
                                       const int dif, const int sdif);
 
+struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
+                                  struct sk_buff *skb, int doff,
+                                  __be32 saddr, __be16 sport,
+                                  __be32 daddr, unsigned short hnum);
+
 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 0819d60..ecb8384 100644 (file)
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -332,10 +332,10 @@ 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 *inet_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;
@@ -346,6 +346,7 @@ static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
        }
        return reuse_sk;
 }
+EXPORT_SYMBOL_GPL(inet_lookup_reuseport);
 
 /*
  * Here are some nice properties to exploit here. The BSD API
@@ -369,8 +370,8 @@ static struct sock *inet_lhash2_lookup(struct net *net,
        sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
                score = compute_score(sk, net, hnum, daddr, dif, sdif);
                if (score > hiscore) {
-                       result = lookup_reuseport(net, sk, skb, doff,
-                                                 saddr, sport, daddr, hnum);
+                       result = inet_lookup_reuseport(net, sk, skb, doff,
+                                                      saddr, sport, daddr, hnum);
                        if (result)
                                return result;
 
@@ -399,7 +400,7 @@ static inline struct sock *inet_lookup_run_bpf(struct net *net,
        if (no_reuseport || IS_ERR_OR_NULL(sk))
                return sk;
 
-       reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+       reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
        if (reuse_sk)
                sk = reuse_sk;
        return sk;

diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index b64b490..b7c5686 100644 (file)
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -111,12 +111,12 @@ 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,
-                                           const struct in6_addr *saddr,
-                                           __be16 sport,
-                                           const struct in6_addr *daddr,
-                                           unsigned short hnum)
+struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
+                                   struct sk_buff *skb, int doff,
+                                   const struct in6_addr *saddr,
+                                   __be16 sport,
+                                   const struct in6_addr *daddr,
+                                   unsigned short hnum)
 {
        struct sock *reuse_sk = NULL;
        u32 phash;
@@ -127,6 +127,7 @@ static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
        }
        return reuse_sk;
 }
+EXPORT_SYMBOL_GPL(inet6_lookup_reuseport);
 
 /* called with rcu_read_lock() */
 static struct sock *inet6_lhash2_lookup(struct net *net,
@@ -143,8 +144,8 @@ static struct sock *inet6_lhash2_lookup(struct net *net,
        sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
                score = compute_score(sk, net, hnum, daddr, dif, sdif);
                if (score > hiscore) {
-                       result = lookup_reuseport(net, sk, skb, doff,
-                                                 saddr, sport, daddr, hnum);
+                       result = inet6_lookup_reuseport(net, sk, skb, doff,
+                                                       saddr, sport, daddr, hnum);
                        if (result)
                                return result;
 
@@ -175,7 +176,7 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net,
        if (no_reuseport || IS_ERR_OR_NULL(sk))
                return sk;
 
-       reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+       reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
        if (reuse_sk)
                sk = reuse_sk;
        return sk;