mptcp: Fix undefined mptcp_handle_ipv6_mapped for modular IPV6
diff mbox series

Message ID 20200130094526.22483-1-geert@linux-m68k.org
State Accepted
Commit 31484d56ca9511e62c08626db338d2aaafb3aa3f
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Series
  • mptcp: Fix undefined mptcp_handle_ipv6_mapped for modular IPV6
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Commit Message

Geert Uytterhoeven Jan. 30, 2020, 9:45 a.m. UTC
If CONFIG_MPTCP=y, CONFIG_MPTCP_IPV6=n, and CONFIG_IPV6=m:

    ERROR: "mptcp_handle_ipv6_mapped" [net/ipv6/ipv6.ko] undefined!

This does not happen if CONFIG_MPTCP_IPV6=y, as CONFIG_MPTCP_IPV6
selects CONFIG_IPV6, and thus forces CONFIG_IPV6 builtin.

As exporting a symbol for an empty function would be a bit wasteful, fix
this by providing a dummy version of mptcp_handle_ipv6_mapped() for the
CONFIG_MPTCP_IPV6=n case.

Rename mptcp_handle_ipv6_mapped() to mptcpv6_handle_mapped(), to make it
clear this is a pure-IPV6 function, just like mptcpv6_init().

Fixes: cec37a6e41aae7bf ("mptcp: Handle MP_CAPABLE options for outgoing connections")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 include/net/mptcp.h | 9 +++------
 net/ipv6/tcp_ipv6.c | 6 +++---
 net/mptcp/subflow.c | 6 +++---
 3 files changed, 9 insertions(+), 12 deletions(-)

Comments

David Miller Jan. 30, 2020, 9:56 a.m. UTC | #1
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Thu, 30 Jan 2020 10:45:26 +0100

> If CONFIG_MPTCP=y, CONFIG_MPTCP_IPV6=n, and CONFIG_IPV6=m:
> 
>     ERROR: "mptcp_handle_ipv6_mapped" [net/ipv6/ipv6.ko] undefined!
> 
> This does not happen if CONFIG_MPTCP_IPV6=y, as CONFIG_MPTCP_IPV6
> selects CONFIG_IPV6, and thus forces CONFIG_IPV6 builtin.
> 
> As exporting a symbol for an empty function would be a bit wasteful, fix
> this by providing a dummy version of mptcp_handle_ipv6_mapped() for the
> CONFIG_MPTCP_IPV6=n case.
> 
> Rename mptcp_handle_ipv6_mapped() to mptcpv6_handle_mapped(), to make it
> clear this is a pure-IPV6 function, just like mptcpv6_init().
> 
> Fixes: cec37a6e41aae7bf ("mptcp: Handle MP_CAPABLE options for outgoing connections")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Looks good, applied, thank you.

Patch
diff mbox series

diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index 27627e2d1bc2e9a1..c971d25431ea9412 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -174,15 +174,12 @@  static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
 
 #endif /* CONFIG_MPTCP */
 
-void mptcp_handle_ipv6_mapped(struct sock *sk, bool mapped);
-
 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
 int mptcpv6_init(void);
+void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
 #elif IS_ENABLED(CONFIG_IPV6)
-static inline int mptcpv6_init(void)
-{
-	return 0;
-}
+static inline int mptcpv6_init(void) { return 0; }
+static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
 #endif
 
 #endif /* __NET_MPTCP_H */
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 33a578a3eb3abadb..eaf09e6b78442e09 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -239,7 +239,7 @@  static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 
 		icsk->icsk_af_ops = &ipv6_mapped;
 		if (sk_is_mptcp(sk))
-			mptcp_handle_ipv6_mapped(sk, true);
+			mptcpv6_handle_mapped(sk, true);
 		sk->sk_backlog_rcv = tcp_v4_do_rcv;
 #ifdef CONFIG_TCP_MD5SIG
 		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
@@ -251,7 +251,7 @@  static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 			icsk->icsk_ext_hdr_len = exthdrlen;
 			icsk->icsk_af_ops = &ipv6_specific;
 			if (sk_is_mptcp(sk))
-				mptcp_handle_ipv6_mapped(sk, false);
+				mptcpv6_handle_mapped(sk, false);
 			sk->sk_backlog_rcv = tcp_v6_do_rcv;
 #ifdef CONFIG_TCP_MD5SIG
 			tp->af_specific = &tcp_sock_ipv6_specific;
@@ -1208,7 +1208,7 @@  static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
 
 		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
 		if (sk_is_mptcp(newsk))
-			mptcp_handle_ipv6_mapped(newsk, true);
+			mptcpv6_handle_mapped(newsk, true);
 		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
 #ifdef CONFIG_TCP_MD5SIG
 		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 1662e117894900a8..de04b03fa41e70a6 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -582,9 +582,9 @@  subflow_default_af_ops(struct sock *sk)
 	return &subflow_specific;
 }
 
-void mptcp_handle_ipv6_mapped(struct sock *sk, bool mapped)
-{
 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
+void mptcpv6_handle_mapped(struct sock *sk, bool mapped)
+{
 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct inet_connection_sock_af_ops *target;
@@ -599,8 +599,8 @@  void mptcp_handle_ipv6_mapped(struct sock *sk, bool mapped)
 
 	subflow->icsk_af_ops = icsk->icsk_af_ops;
 	icsk->icsk_af_ops = target;
-#endif
 }
+#endif
 
 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock)
 {