ipv6: Kill ipv6 dependency of icmpv6_send().

Following patch adds icmp-registration module for ipv6.  It allows
ipv6 protocol to register icmp_sender which is used for sending
ipv6 icmp msgs.  This extra layer allows us to kill ipv6 dependency
for sending icmp packets.

This patch also fixes ip_tunnel compilation problem when ip_tunnel
is statically compiled in kernel but ipv6 is module

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 3 deletions

diff --git a/include/linux/icmpv6.h b/include/linux/icmpv6.h
index b4f6c29caced..630f45335c73 100644
--- a/include/linux/icmpv6.h
+++ b/include/linux/icmpv6.h
@@ -11,9 +11,21 @@ static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
 
 #include <linux/netdevice.h>
 
-extern void                             icmpv6_send(struct sk_buff *skb,
-                                                    u8 type, u8 code,
-                                                    __u32 info);
+#if IS_ENABLED(CONFIG_IPV6)
+extern void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info);
+
+typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info);
+extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
+extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
+
+#else
+
+static inline void icmpv6_send(struct sk_buff *skb,
+                               u8 type, u8 code, __u32 info)
+{
+
+}
+#endif
 
 extern int                              icmpv6_init(void);
 extern int                              icmpv6_err_convert(u8 type, u8 code,