ipv6: udp: constify 'struct net' parameter of socket lookups

Following helpers do not touch their 'struct net' argument.

- udp6_lib_lookup()
- __udp6_lib_lookup()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240802134029.3748005-6-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/ipv6_stubs.h

@@ -82,7 +82,7 @@ extern const struct ipv6_stub *ipv6_stub __read_mostly;
 struct ipv6_bpf_stub {
 	int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 			  u32 flags);
-	struct sock *(*udp6_lib_lookup)(struct net *net,
+	struct sock *(*udp6_lib_lookup)(const struct net *net,
 				     const struct in6_addr *saddr, __be16 sport,
 				     const struct in6_addr *daddr, __be16 dport,
 				     int dif, int sdif, struct udp_table *tbl,

include/net/udp.h

@@ -305,11 +305,11 @@ struct sock *__udp4_lib_lookup(const struct net *net, __be32 saddr,
 			       struct udp_table *tbl, struct sk_buff *skb);
 struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
 				 __be16 sport, __be16 dport);
-struct sock *udp6_lib_lookup(struct net *net,
+struct sock *udp6_lib_lookup(const struct net *net,
 			     const struct in6_addr *saddr, __be16 sport,
 			     const struct in6_addr *daddr, __be16 dport,
 			     int dif);
-struct sock *__udp6_lib_lookup(struct net *net,
+struct sock *__udp6_lib_lookup(const struct net *net,
 			       const struct in6_addr *saddr, __be16 sport,
 			       const struct in6_addr *daddr, __be16 dport,
 			       int dif, int sdif, struct udp_table *tbl,

net/ipv6/udp.c

@@ -114,7 +114,7 @@ void udp_v6_rehash(struct sock *sk)
 	udp_lib_rehash(sk, new_hash);
 }
 
-static int compute_score(struct sock *sk, struct net *net,
+static int compute_score(struct sock *sk, const struct net *net,
 			 const struct in6_addr *saddr, __be16 sport,
 			 const struct in6_addr *daddr, unsigned short hnum,
 			 int dif, int sdif)
@@ -160,7 +160,7 @@ static int compute_score(struct sock *sk, struct net *net,
 }
 
 /* called with rcu_read_lock() */
-static struct sock *udp6_lib_lookup2(struct net *net,
+static struct sock *udp6_lib_lookup2(const struct net *net,
 		const struct in6_addr *saddr, __be16 sport,
 		const struct in6_addr *daddr, unsigned int hnum,
 		int dif, int sdif, struct udp_hslot *hslot2,
@@ -217,7 +217,7 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 }
 
 /* rcu_read_lock() must be held */
-struct sock *__udp6_lib_lookup(struct net *net,
+struct sock *__udp6_lib_lookup(const struct net *net,
 			       const struct in6_addr *saddr, __be16 sport,
 			       const struct in6_addr *daddr, __be16 dport,
 			       int dif, int sdif, struct udp_table *udptable,
@@ -300,7 +300,7 @@ struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
  * Does increment socket refcount.
  */
 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
-struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
+struct sock *udp6_lib_lookup(const struct net *net, const struct in6_addr *saddr, __be16 sport,
 			     const struct in6_addr *daddr, __be16 dport, int dif)
 {
 	struct sock *sk;