1 #include <linux/export.h>
2 #include <linux/icmpv6.h>
3 #include <linux/mutex.h>
4 #include <linux/netdevice.h>
5 #include <linux/spinlock.h>
9 #if IS_ENABLED(CONFIG_IPV6)
11 #if !IS_BUILTIN(CONFIG_IPV6)
13 static ip6_icmp_send_t __rcu *ip6_icmp_send;
15 int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
17 return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
20 EXPORT_SYMBOL(inet6_register_icmp_sender);
22 int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
26 ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
33 EXPORT_SYMBOL(inet6_unregister_icmp_sender);
35 void __icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
36 const struct inet6_skb_parm *parm)
38 ip6_icmp_send_t *send;
41 send = rcu_dereference(ip6_icmp_send);
43 send(skb, type, code, info, NULL, parm);
46 EXPORT_SYMBOL(__icmpv6_send);
49 #if IS_ENABLED(CONFIG_NF_NAT)
50 #include <net/netfilter/nf_conntrack.h>
51 void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info)
53 struct inet6_skb_parm parm = { 0 };
54 struct sk_buff *cloned_skb = NULL;
55 enum ip_conntrack_info ctinfo;
56 struct in6_addr orig_ip;
59 ct = nf_ct_get(skb_in, &ctinfo);
60 if (!ct || !(ct->status & IPS_SRC_NAT)) {
61 __icmpv6_send(skb_in, type, code, info, &parm);
65 if (skb_shared(skb_in))
66 skb_in = cloned_skb = skb_clone(skb_in, GFP_ATOMIC);
68 if (unlikely(!skb_in || skb_network_header(skb_in) < skb_in->head ||
69 (skb_network_header(skb_in) + sizeof(struct ipv6hdr)) >
70 skb_tail_pointer(skb_in) || skb_ensure_writable(skb_in,
71 skb_network_offset(skb_in) + sizeof(struct ipv6hdr))))
74 orig_ip = ipv6_hdr(skb_in)->saddr;
75 ipv6_hdr(skb_in)->saddr = ct->tuplehash[0].tuple.src.u3.in6;
76 __icmpv6_send(skb_in, type, code, info, &parm);
77 ipv6_hdr(skb_in)->saddr = orig_ip;
79 consume_skb(cloned_skb);
81 EXPORT_SYMBOL(icmpv6_ndo_send);