net: introduce EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL()

[ Upstream commit 54568a84c95bdea20227cf48d41f198d083e78dd ]

We have many EXPORT_SYMBOL(x) in networking tree because IPv6
can be built as a module.

CONFIG_IPV6=y is becoming the norm.

Define a EXPORT_IPV6_MOD(x) which only exports x
for modular IPv6.

Same principle applies to EXPORT_IPV6_MOD_GPL()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
Link: https://patch.msgid.link/20250212132418.1524422-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 54568a84c95bdea20227cf48d41f198d083e78dd)
[needed as dependency for tcp: secure_seq: add back ports to TS offset]
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/ip.h b/include/net/ip.h
index c65ca2765e29a2e7b44882593afcf04a72c9b036..39c6a4033aeda2241ac81a800406917f50bb1326 100644 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -675,6 +675,14 @@ static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast,
                memcpy(buf, &naddr, sizeof(naddr));
 }
 
+#if IS_MODULE(CONFIG_IPV6)
+#define EXPORT_IPV6_MOD(X) EXPORT_SYMBOL(X)
+#define EXPORT_IPV6_MOD_GPL(X) EXPORT_SYMBOL_GPL(X)
+#else
+#define EXPORT_IPV6_MOD(X)
+#define EXPORT_IPV6_MOD_GPL(X)
+#endif
+
 #if IS_ENABLED(CONFIG_IPV6)
 #include <linux/ipv6.h>
 #endif