sctp: Remove sctp_copy_sock() and sctp_copy_descendant().

Now, sctp_accept() and sctp_do_peeloff() use sk_clone(), and
we no longer need sctp_copy_sock() and sctp_copy_descendant().

Let's remove them.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20251023231751.4168390-9-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 1 insertions, 81 deletions

diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index b6ec08072533..ac1c75975908 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -355,14 +355,6 @@ static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
 
 #define inet_sk(ptr) container_of_const(ptr, struct inet_sock, sk)
 
-static inline void __inet_sk_copy_descendant(struct sock *sk_to,
-					     const struct sock *sk_from,
-					     const int ancestor_size)
-{
-	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
-	       sk_from->sk_prot->obj_size - ancestor_size);
-}
-
 int inet_sk_rebuild_header(struct sock *sk);
 
 /**
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index e96d1bd087f6..bb4b80c12541 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -94,8 +94,7 @@ void sctp_data_ready(struct sock *sk);
 __poll_t sctp_poll(struct file *file, struct socket *sock,
 		poll_table *wait);
 void sctp_sock_rfree(struct sk_buff *skb);
-void sctp_copy_sock(struct sock *newsk, struct sock *sk,
-		    struct sctp_association *asoc);
+
 extern struct percpu_counter sctp_sockets_allocated;
 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
 struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int *);
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 60d3e340dfed..ac737e60829b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -9491,72 +9491,6 @@ done:
 	sctp_skb_set_owner_r(skb, sk);
 }
 
-void sctp_copy_sock(struct sock *newsk, struct sock *sk,
-		    struct sctp_association *asoc)
-{
-	struct inet_sock *inet = inet_sk(sk);
-	struct inet_sock *newinet;
-	struct sctp_sock *sp = sctp_sk(sk);
-
-	newsk->sk_type = sk->sk_type;
-	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
-	newsk->sk_flags = sk->sk_flags;
-	newsk->sk_tsflags = sk->sk_tsflags;
-	newsk->sk_no_check_tx = sk->sk_no_check_tx;
-	newsk->sk_no_check_rx = sk->sk_no_check_rx;
-	newsk->sk_reuse = sk->sk_reuse;
-	sctp_sk(newsk)->reuse = sp->reuse;
-
-	newsk->sk_shutdown = sk->sk_shutdown;
-	newsk->sk_destruct = sk->sk_destruct;
-	newsk->sk_family = sk->sk_family;
-	newsk->sk_protocol = IPPROTO_SCTP;
-	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
-	newsk->sk_sndbuf = sk->sk_sndbuf;
-	newsk->sk_rcvbuf = sk->sk_rcvbuf;
-	newsk->sk_lingertime = sk->sk_lingertime;
-	newsk->sk_rcvtimeo = READ_ONCE(sk->sk_rcvtimeo);
-	newsk->sk_sndtimeo = READ_ONCE(sk->sk_sndtimeo);
-	newsk->sk_rxhash = sk->sk_rxhash;
-	newsk->sk_gso_type = sk->sk_gso_type;
-
-	newinet = inet_sk(newsk);
-
-	/* Initialize sk's sport, dport, rcv_saddr and daddr for
-	 * getsockname() and getpeername()
-	 */
-	newinet->inet_sport = inet->inet_sport;
-	newinet->inet_saddr = inet->inet_saddr;
-	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
-	newinet->inet_dport = htons(asoc->peer.port);
-	newinet->pmtudisc = inet->pmtudisc;
-	atomic_set(&newinet->inet_id, get_random_u16());
-
-	newinet->uc_ttl = inet->uc_ttl;
-	inet_set_bit(MC_LOOP, newsk);
-	newinet->mc_ttl = 1;
-	newinet->mc_index = 0;
-	newinet->mc_list = NULL;
-
-	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
-		net_enable_timestamp();
-
-	/* Set newsk security attributes from original sk and connection
-	 * security attribute from asoc.
-	 */
-	security_sctp_sk_clone(asoc, sk, newsk);
-}
-
-static inline void sctp_copy_descendant(struct sock *sk_to,
-					const struct sock *sk_from)
-{
-	size_t ancestor_size = sizeof(struct inet_sock);
-
-	ancestor_size += sk_from->sk_prot->obj_size;
-	ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
-	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
-}
-
 /* Populate the fields of the newsk from the oldsk and migrate the assoc
  * and its messages to the newsk.
  */
@@ -9573,11 +9507,6 @@ static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
 	struct sctp_bind_hashbucket *head;
 	int err;
 
-	/* Migrate all the socket level options to the new socket.
-	 * Brute force copy old sctp opt.
-	 */
-	sctp_copy_descendant(newsk, oldsk);
-
 	/* Restore the ep value that was overwritten with the above structure
 	 * copy.
 	 */