From 5f5624cf156283687e11ea329c7a0523c677ea0e Mon Sep 17 00:00:00 2001 From: Pravin B Shelar Date: Thu, 25 Apr 2013 11:08:30 +0000 Subject: 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv6/ip6_icmp.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 net/ipv6/ip6_icmp.c (limited to 'net/ipv6/ip6_icmp.c') diff --git a/net/ipv6/ip6_icmp.c b/net/ipv6/ip6_icmp.c new file mode 100644 index 000000000000..4578e23834f7 --- /dev/null +++ b/net/ipv6/ip6_icmp.c @@ -0,0 +1,47 @@ +#include +#include +#include +#include +#include + +#include + +#if IS_ENABLED(CONFIG_IPV6) + +static ip6_icmp_send_t __rcu *ip6_icmp_send; + +int inet6_register_icmp_sender(ip6_icmp_send_t *fn) +{ + return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ? + 0 : -EBUSY; +} +EXPORT_SYMBOL(inet6_register_icmp_sender); + +int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn) +{ + int ret; + + ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ? + 0 : -EINVAL; + + synchronize_net(); + + return ret; +} +EXPORT_SYMBOL(inet6_unregister_icmp_sender); + +void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) +{ + ip6_icmp_send_t *send; + + rcu_read_lock(); + send = rcu_dereference(ip6_icmp_send); + + if (!send) + goto out; + send(skb, type, code, info); +out: + rcu_read_unlock(); +} +EXPORT_SYMBOL(icmpv6_send); +#endif -- cgit v1.2.3