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
 
 
12static ip6_icmp_send_t __rcu *ip6_icmp_send;
13
14int 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}
19EXPORT_SYMBOL(inet6_register_icmp_sender);
20
21int 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}
32EXPORT_SYMBOL(inet6_unregister_icmp_sender);
33
34void 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);
 
 
 
 
44out:
45	rcu_read_unlock();
46}
47EXPORT_SYMBOL(icmpv6_send);
 
48#endif

 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#if !IS_BUILTIN(CONFIG_IPV6)
13
14static ip6_icmp_send_t __rcu *ip6_icmp_send;
15
16int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
17{
18	return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
19		0 : -EBUSY;
20}
21EXPORT_SYMBOL(inet6_register_icmp_sender);
22
23int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
24{
25	int ret;
26
27	ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
28	      0 : -EINVAL;
29
30	synchronize_net();
31
32	return ret;
33}
34EXPORT_SYMBOL(inet6_unregister_icmp_sender);
35
36void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
37{
38	ip6_icmp_send_t *send;
39
40	rcu_read_lock();
41	send = rcu_dereference(ip6_icmp_send);
42	if (send)
43		send(skb, type, code, info, NULL);
44	rcu_read_unlock();
45}
46EXPORT_SYMBOL(icmpv6_send);
47#endif
48
49#if IS_ENABLED(CONFIG_NF_NAT)
50#include <net/netfilter/nf_conntrack.h>
51void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info)
52{
53	struct sk_buff *cloned_skb = NULL;
54	enum ip_conntrack_info ctinfo;
55	struct in6_addr orig_ip;
56	struct nf_conn *ct;
57
58	ct = nf_ct_get(skb_in, &ctinfo);
59	if (!ct || !(ct->status & IPS_SRC_NAT)) {
60		icmpv6_send(skb_in, type, code, info);
61		return;
62	}
63
64	if (skb_shared(skb_in))
65		skb_in = cloned_skb = skb_clone(skb_in, GFP_ATOMIC);
66
67	if (unlikely(!skb_in || skb_network_header(skb_in) < skb_in->head ||
68	    (skb_network_header(skb_in) + sizeof(struct ipv6hdr)) >
69	    skb_tail_pointer(skb_in) || skb_ensure_writable(skb_in,
70	    skb_network_offset(skb_in) + sizeof(struct ipv6hdr))))
71		goto out;
72
73	orig_ip = ipv6_hdr(skb_in)->saddr;
74	ipv6_hdr(skb_in)->saddr = ct->tuplehash[0].tuple.src.u3.in6;
75	icmpv6_send(skb_in, type, code, info);
76	ipv6_hdr(skb_in)->saddr = orig_ip;
77out:
78	consume_skb(cloned_skb);
79}
80EXPORT_SYMBOL(icmpv6_ndo_send);
81#endif
82#endif