Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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 const struct inet6_skb_parm *parm)
38{
39 ip6_icmp_send_t *send;
40
41 rcu_read_lock();
42 send = rcu_dereference(ip6_icmp_send);
43 if (send)
44 send(skb, type, code, info, NULL, parm);
45 rcu_read_unlock();
46}
47EXPORT_SYMBOL(__icmpv6_send);
48#endif
49
50#if IS_ENABLED(CONFIG_NF_NAT)
51#include <net/netfilter/nf_conntrack.h>
52void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info)
53{
54 struct inet6_skb_parm parm = { 0 };
55 struct sk_buff *cloned_skb = NULL;
56 enum ip_conntrack_info ctinfo;
57 enum ip_conntrack_dir dir;
58 struct in6_addr orig_ip;
59 struct nf_conn *ct;
60
61 ct = nf_ct_get(skb_in, &ctinfo);
62 if (!ct || !(READ_ONCE(ct->status) & IPS_NAT_MASK)) {
63 __icmpv6_send(skb_in, type, code, info, &parm);
64 return;
65 }
66
67 if (skb_shared(skb_in))
68 skb_in = cloned_skb = skb_clone(skb_in, GFP_ATOMIC);
69
70 if (unlikely(!skb_in || skb_network_header(skb_in) < skb_in->head ||
71 (skb_network_header(skb_in) + sizeof(struct ipv6hdr)) >
72 skb_tail_pointer(skb_in) || skb_ensure_writable(skb_in,
73 skb_network_offset(skb_in) + sizeof(struct ipv6hdr))))
74 goto out;
75
76 orig_ip = ipv6_hdr(skb_in)->saddr;
77 dir = CTINFO2DIR(ctinfo);
78 ipv6_hdr(skb_in)->saddr = ct->tuplehash[dir].tuple.src.u3.in6;
79 __icmpv6_send(skb_in, type, code, info, &parm);
80 ipv6_hdr(skb_in)->saddr = orig_ip;
81out:
82 consume_skb(cloned_skb);
83}
84EXPORT_SYMBOL(icmpv6_ndo_send);
85#endif
86#endif