1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/export.h> 3 #include <linux/icmpv6.h> 4 #include <linux/mutex.h> 5 #include <linux/netdevice.h> 6 #include <linux/spinlock.h> 7 8 #include <net/ipv6.h> 9 10 #if IS_ENABLED(CONFIG_IPV6) 11 12 static ip6_icmp_send_t __rcu *ip6_icmp_send; 13 14 int inet6_register_icmp_sender(ip6_icmp_send_t *fn) 15 { 16 return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ? 17 0 : -EBUSY; 18 } 19 EXPORT_SYMBOL(inet6_register_icmp_sender); 20 21 int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn) 22 { 23 int ret; 24 25 ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ? 26 0 : -EINVAL; 27 28 synchronize_net(); 29 30 return ret; 31 } 32 EXPORT_SYMBOL(inet6_unregister_icmp_sender); 33 34 void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 35 { 36 ip6_icmp_send_t *send; 37 38 rcu_read_lock(); 39 send = rcu_dereference(ip6_icmp_send); 40 41 if (!send) 42 goto out; 43 send(skb, type, code, info, NULL); 44 out: 45 rcu_read_unlock(); 46 } 47 EXPORT_SYMBOL(icmpv6_send); 48 #endif 49